Free tools for everyone.
No sign-up. No tracking. No ads.
Count words, characters, sentences, paragraphs. Reading and speaking time estimates. Instant results.
Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and more.
Generate placeholder text for your designs. Paragraphs, sentences, or words. Copy as text or HTML.
Compare two texts side by side and see exactly what changed. Word-level highlighting, inline or split view.
Clean up any list. Sort alphabetically, remove duplicates, reverse, trim whitespace, number lines.
Check if your post fits Twitter, Instagram, SMS, or SEO limits. Live count with platform presets.
Turn any text into a clean URL slug. Handles accents, special characters, and stopwords.
Live Markdown preview with GitHub-flavored basics. Export to HTML or .md.
Strip zero-width chars, normalize spaces, fix line endings, remove suspicious Unicode.
Convert Markdown to HTML or HTML back to Markdown. Live conversion both ways.
Flesch, Gunning Fog, SMOG, Coleman-Liau, ARI. See what grade level your text is written at.
Repeat, pad, reverse, split, join, find/replace, count. The little string operations all in one place.
Visual editor for GitHub-flavored Markdown tables. Paste from CSV, set alignment, sort columns.
Make 𝐛𝐨𝐥𝐝, 𝑖𝑡𝑎𝑙𝑖𝑐, 𝓈𝒸𝓇𝒾𝓅𝓉, ɐlǝlǝɹǝp text using Unicode. For social bios and posts.
Reverse any text by character, word, or line. Handles multi-byte emoji properly. Copy with one click.
Bulk find and replace across any text. Regex, case sensitivity, whole-word toggles. Match count as you type.
Strip all HTML tags, decode entities, keep paragraph breaks and bullets. DOMParser-based — handles real-world HTML.
1, 2, 3-word phrase frequency for SEO content audits. Stopword filtering, density % per phrase.
Test your typing speed — words per minute, accuracy, mistakes. 15s / 30s / 60s / 2min sessions.
Flip text upside down and backwards (ɐǝ) for bios and posts. Copy anywhere.
Repeat text or a word N times, with optional separator, new line or numbering.
Remove Markdown formatting for clean plain text. Strips headings, bold, links, code, lists.
Generate bacon, pirate, hipster or corporate placeholder text. Fun Lorem Ipsum alternative.
Strip newlines from text. Join with spaces, delete entirely, or keep paragraph breaks.
Number each line of text. Custom start number, separator and zero-padding.
Delete repeated words from text, keep the first occurrence. Case-insensitive option.
Pull every email address out of pasted text. Deduplicate and sort the results.
Pull every link out of pasted text. Deduplicate and sort the results.
Strip all emojis and pictographic symbols from text, leaving clean plain text.
Translate English to Pig Latin. Handles consonant clusters, keeps caps and punctuation.
Convert text to leetspeak. Basic vowel swaps or full substitution.
Check if a word, phrase or number reads the same backwards. Ignores case and punctuation.
Count how many times a word, phrase or character appears in text. Whole-word + case options.
Strip accents & diacritics — café → cafe. Handles ß, ø, æ, ł and more.
Corrupt text into creepy glitch ‘zalgo’ style with adjustable intensity. Copy & paste anywhere.
Copy genuinely invisible Unicode characters — blank usernames, empty messages, spacing.
Bold the start of each word for faster reading, with adjustable strength and live preview.
Convert straight quotes to curly typographic quotes and back, with smart dashes and ellipsis.
Flip the order of words in each line (last word first), keeping the letters intact.
Count vowels, consonants, letters and the vowel ratio in any text, live.
Turn a phrase into an acronym from the first letters, optionally skipping minor words.
Encode/decode with ROT47, rotating all visible ASCII by 47 (a ROT13 for symbols too).
Mask chosen words in text with asterisks or any character, optionally keep the first letter.
Add a prefix and suffix to every line at once, for quoting, tags, commas and lists.
Download YouTube video thumbnails in the highest available resolution. Batch download as ZIP.
Download auto-generated or manual subtitles from any YouTube video. SRT or plain text. Batch processing supported.
Paste any YouTube URL and pull the video's tags. Copy individually or as a comma-separated list.
Strip ?si=, ?feature=, ?pp= and other tracking parameters from YouTube URLs. Keep just v, t and list.
Paste a video link, toggle autoplay / mute / loop / start-time, copy the iframe. Responsive 16:9 wrapper included.
Build clean YouTube chapters with live validation — checks 00:00 start, 3-chapter minimum, 10-second gaps.
Live 100-char title counter with truncation marks for desktop search, mobile feed and suggested videos.
5000-char description counter, above-the-fold preview, auto-extract chapters / links / hashtags / mentions.
Estimate AdSense income from views × RPM. Niche presets for finance, gaming, beauty, crypto, education.
Live 280-char counter. Paste anything longer and it auto-splits into numbered thread tweets ready to copy.
Paste long text, get a numbered Twitter / X thread auto-split into 280-char tweets at sentence boundaries.
Turn a Twitter / X post into a PNG to share on Instagram, LinkedIn or blogs. Light, dim or dark theme.
Strip ?s=20, ?t=, ref_src and other tracking parameters from Twitter / X URLs.
Live 160-character Twitter / X bio counter with emoji-safe counting and profile mockup preview.
Crop any photo to a Twitter / X banner (1500×500) with safe zones for the profile pic + mobile crop.
Plan polls before posting — 25-char limit per option (2-4 options), duration picker, live preview.
Live 3000-char counter with the "See more" truncation line marked at 210 chars so your hook lands.
220-character headline limit with live counter, profile preview, and search-result truncation preview.
2600-character About section counter with "see more" cutoff preview at ~265 chars.
Combine slide images into one PDF for LinkedIn Document posts. Drag to reorder, pick aspect ratio.
Strip ?trackingId=, ?lipi=, ?refId=, ?utm_* and other tracking parameters from LinkedIn URLs.
Crop any photo to exactly 1584×396 with drag-to-position. Safe zones for profile pic and mobile crop included.
Live 1250-char comment counter with feed-preview cutoff at "…see more". Best practice tips inline.
150-char title + 110000-char body counter, reading-time estimate, feed snippet preview.
140-char question + 30-char options (2-4), duration picker, live LinkedIn-style poll preview.
Live 2200-char counter with feed preview — see what appears before "…more" and pull out your hashtags.
Add real line breaks to your Instagram bio using an invisible-character trick that survives saving.
Split one wide image into 2-10 square Instagram-ready slides. Download all as ZIP.
Make minimalist 1080×1920 Story highlight covers — pick a color, add an emoji, download PNG.
Calculate Instagram engagement rate from followers, likes and comments. With industry benchmarks.
Drag, zoom and preview the circular crop. Export 320×320 (Instagram-native) or 1080×1080 (high-res).
Plan your feed visually — drop up to 12 images, drag to reorder, see how the 3-column grid will look.
Crop to 1080×1920 with the 1:1 grid-thumbnail safe zone marked so your reel cover looks right on the grid too.
Analyze your hashtag mix by popularity tier. Mega / large / medium / niche / micro distribution + balance feedback.
Compress and resize JPG, PNG, WebP in your browser. Batch processing. Target file size or quality.
Download any image from the web. Paste a direct URL or a webpage link to find and save all its images.
Convert any image to a data URL for embedding in CSS, HTML, or JSON. Drop or paste.
Convert PNG ↔ JPG ↔ WebP in your browser. Set quality, batch convert, download as ZIP.
Click any pixel in an uploaded image to get HEX, RGB, HSL. Build a palette of multiple picks.
Rotate any image 90°, 180°, 270° or flip horizontally / vertically. Lossless at right angles. Custom-angle slider for arbitrary rotation.
Free crop or aspect-lock to 1:1, 4:5, 9:16, 16:9 and more. Drag handles to size + position. PNG/JPG export.
Convert iPhone HEIC / HEIF photos to standard JPG or PNG. Batch convert, download as ZIP. Browser-only.
Extract text from any image via Tesseract.js. 100+ languages, browser-only — your image never uploaded.
Draw redaction boxes on an image — pixelate, blur, or solid black bar. For faces, license plates, sensitive info.
Combine 2-9 photos into one image. Grid layout, configurable gap + background, IG / Story output sizes.
Auto-extract dominant 3-12 colors from any image. Median-cut quantization, HEX / RGB / HSL output.
Combine 2-30 images into an animated GIF. Drag to reorder, set frame delay + size. Browser-only via gif.js.
See camera, lens, exposure, and GPS data in your photos. Strip metadata before sharing for privacy.
Make favicons from an emoji, text, or image. Download PNGs at every size. Copy HTML snippet.
Resize images to exact pixels with aspect lock. In your browser, no upload.
Overlay text on an image — position, size, color, opacity. In your browser.
Crop a photo to a circle or square avatar at any size. Transparent PNG.
Turn a photo into text ASCII art — width, charset, invert. Copy/download.
Add classic top/bottom caption text to an image and download. In your browser.
Convert a photo to black and white in your browser, adjustable, no upload.
Apply an adjustable blur to a photo in your browser and download it, no upload.
Invert a photo's colours for a negative effect, in your browser, no upload.
Add rounded corners to an image, download as transparent PNG, no upload.
Add a solid colour border or frame around an image, choose width and colour.
Strip EXIF, GPS and metadata from a photo in your browser before sharing. No upload.
Rasterise SVG code or a file to a PNG at any size, optional transparent background.
See an image's width, height, aspect ratio, megapixels and file size instantly.
Count the unique colours in an image and see the most common ones. No upload.
Extract text from any PDF file. Copy or download as .txt. Your file never leaves your device.
Convert every page of a PDF into a JPG or PNG image. Pick 72/144/300 DPI. Download single pages or all as ZIP.
Combine multiple JPG, PNG, WebP or GIF images into a single PDF. Drag to reorder, pick page size and margin.
Combine multiple PDFs into one file. Drag to reorder. Runs entirely in your browser — your PDFs stay local.
Extract a page range or split every page into its own file. Download as ZIP. Range syntax: 1-5, 8, 10-12.
Rotate every page or click thumbnails to rotate individual pages 90, 180 or 270 degrees. Save as new PDF.
Click page thumbnails to mark them for removal, then save a clean PDF without those pages.
Add page numbers to any PDF. Pick position (header / footer × left / center / right), format, start number.
Add a diagonal text watermark — DRAFT, CONFIDENTIAL, copyright. Color, opacity, rotation, font size.
Paste Markdown, see a live preview, download a clean PDF. Tables, code blocks, lists, all supported.
Paste raw HTML, see a live preview, download a paginated PDF. Inline CSS and data-URL images supported.
Convert .docx files to PDF directly in your browser via mammoth.js — your document never leaves your device. Headings, tables, lists, images preserved.
View + edit Title, Author, Subject, Keywords, Creator. Strip personal info before sharing. SEO-friendly.
Trim margins from every page. Set top / bottom / left / right in mm or percentage. Useful for scanner output.
Drag thumbnails to rearrange pages. Reverse all, remove pages, reset to original order. Save the new PDF.
Insert pages from PDF B into PDF A at any position. Optional page-range filter. Different from Merge.
Place a signature image on any page, drag to position, scale. PNG with transparency works best.
Reduce file size by rasterizing + JPEG-recompressing. Best for scans + slide decks. Before / after size shown.
Lock filled form values into static text — recipient can no longer edit. For signed contracts, tax forms, invoices.
Open any AcroForm PDF, fill every field directly in the browser, save the completed file.
Run OCR on a scanned PDF via Tesseract.js. Output looks identical but has an invisible searchable text layer.
Permanent black-bar redaction — text underneath is destroyed via rasterization, not just hidden.
Convert pages between A4, Letter, Legal, A3, A5 or custom. Fit-with-margins or stretch-to-fill.
Extract text with detected H1/H2/H3 headings via font-size clustering. Best for text-heavy documents.
Semantic h1/p tags or absolute-positioned divs. Two modes. Wrap in full HTML5 document.
Honest text-only conversion to editable .docx. Headings preserved. Best for articles, reports, books.
Upload an image and extract its dominant colors. HEX, RGB, HSL values. Click to copy.
Convert between HEX, RGB, HSL, HSV, CMYK. Eyedrop or type any format. Includes complementary palettes.
Check foreground/background pair against WCAG AA and AAA for normal and large text. Real-time score.
Visual builder for linear and radial CSS gradients. Multiple color stops, live preview, copy code.
Visual builder with multiple stacked shadows, inset toggle, and full control over offset, blur, spread, colour.
Build polished text shadow effects with live preview and presets — glow, emboss, hard drop, neon and more.
Stack CSS filters on any image in real time — blur, brightness, contrast, hue-rotate, saturate, invert, sepia.
Trendy frosted-glass effect builder. Backdrop-filter blur, tint, border, shadow and corner radius tuned live.
Control all 8 corner handles individually. Elliptical radii, live preview, copy the full CSS rule.
Visual builder for CSS clip-path polygons, circles and ellipses. Drag vertices directly in the preview.
Visual builders for CSS gradients, box shadows, and border radius. Live preview, copy code.
Build keyframe animations visually. Drag timeline, edit per-frame properties, copy CSS.
Visual Flexbox builder with live preview. Direction, justify, align, wrap, gap — copy the CSS.
Visual CSS Grid builder. Presets for sidebar, cards, dashboard, Holy Grail. Custom templates supported.
Blend two colors and get the result plus every step in between. Adjustable ratio.
Pure CSS triangles in any direction, size and color via the border trick. Live preview.
Drag handles to design a CSS cubic-bezier easing curve. Live animation preview.
Soft-UI (neumorphic) shadow CSS with dual shadows and a live preview. Copy-paste ready.
Convert px, rem, em, pt and percent for CSS based on your root font size.
Preview colors under protanopia, deuteranopia, tritanopia and achromatopsia for accessibility.
Find the nearest CSS named color for any hex value, with exact-match detection.
Design a button visually, copy the CSS. Colors, radius, border, shadow, live preview.
Pure-CSS loading spinner — size, color, speed. Copy HTML + CSS, no images.
Style scrollbars — width, track & thumb colors, radius. WebKit + standard CSS.
Gradient-filled text via background-clip — two colors + angle, live preview.
Score any selector's specificity (IDs, classes, elements) with a breakdown.
Harmonious palettes from a base color — complementary, triadic, analogous & more.
Generate organic blob shapes as SVG, tune points and randomness, copy or download.
Smooth SVG wave dividers for section transitions, adjustable and downloadable.
Soft multi-colour mesh gradient backgrounds as pure CSS, randomise and copy.
Pure-CSS background patterns (dots, grid, stripes, checkerboard) with custom colours.
Style text underlines (wavy, double, dotted) with colour, thickness and offset.
Fluid clamp() values that scale type or spacing smoothly between two breakpoints.
A matrix of WCAG contrast for a whole palette, with AA/AAA pass-fail for every pair.
Convert a Kelvin temperature to its RGB colour and hex, warm to cool.
Convert a colour to OKLCH, OKLab, LAB, LCH and HWB, the modern CSS colour spaces.
Smooth, realistic CSS box-shadows from stacked layers. Far better than a single shadow.
Build a harmonious type scale from a base size and ratio. Outputs px, rem and CSS vars.
Find out how much your meetings actually cost. Enter attendees, salaries, and duration.
Resize images and videos keeping proportions. Presets for YouTube, Reels, Instagram, DSLR.
Convert between units instantly. Length, weight, temperature, area, volume, speed, data size, time, CSS.
Convert between binary, octal, decimal, and hex. Live-linked fields. Bitwise inspector.
BMI, BMR, ideal weight, TDEE, and macros. Metric or imperial. US Navy body-fat method.
Convert between Roman numerals and regular numbers. Supports extended notation up to 3,999,999.
Three calculators in one: X % of Y, what % is X of Y, and percentage increase/decrease between two numbers.
Generate random integers in any range, one-off or in batch. Cryptographically random, unique option.
Convert between Celsius, Fahrenheit, Kelvin and Rankine. Live three-way conversion as you type.
Spell out any integer in English, from zero to quadrillions. Useful for cheques, legal text, and invoices.
Daily calorie needs using Mifflin-St Jeor. Activity multipliers + targets for cutting, maintaining and bulking.
Calculate due date and current pregnancy week from LMP or conception. Trimester breakdown + milestones.
Pace ↔ time ↔ distance. Split tables for 5K, 10K, half-marathon, marathon at any pace you set.
Cups ↔ grams ↔ ml ↔ oz with per-ingredient density. Plus °C / °F / gas-mark for oven temps.
Wake at the end of a 90-minute cycle (not mid-cycle). Bedtime suggestions or wake-time options.
Unweighted (4.0) + weighted (5.0) GPA from courses, grades, credits, and AP / honors / college flags.
MPG (US + UK), L/100km, km/L, cost-per-mile, full trip cost. Multi-currency.
Paste any recipe, change servings — every ingredient quantity scales. Fraction-aware, decimals or pretty fractions.
Mean, median, mode, range, sum and count from any list of numbers.
Add up work time from start/end rows, subtract breaks. Total in h:mm and decimal hours.
Simplify fractions, fraction to decimal and decimal to fraction, mixed numbers.
Simplify ratios to lowest terms and solve proportions A:B = C:?. Scale mixes and recipes.
Convert numbers to/from scientific, E-notation and engineering notation.
Area, circumference, radius and diameter from any single value.
Area (Heron), perimeter, type and right-angle check from three sides.
Solve a² + b² = c² for the missing side of a right triangle.
Greatest common divisor (HCF) and least common multiple of two or more numbers.
Check if a number is prime and get its prime factorization.
Population & sample standard deviation, variance and mean from a number list.
nCr (combinations), nPr (permutations) and factorials from n and r.
Compare products by price per unit, find the cheapest option at the shelf.
Slope, distance, midpoint and y=mx+b from two points (x1,y1) and (x2,y2).
Solve ax²+bx+c=0: roots (real or complex), discriminant and vertex.
Click counter with keyboard support & custom step. Count is saved in your browser.
List N Fibonacci terms from any start point, exact big-integer math, one-click copy.
Break a number into its prime factors, in exponent form (360 = 2³ × 3² × 5).
Compute n! exactly with big-integer math, plus the digit count.
Interest & total from principal, rate and time (I = P·r·t).
Mean, median, mode, range, sum, min and max from any list of numbers.
Weighted mean from values and weights, plus the plain average for comparison.
Raise a base to any exponent, with exact integer results and scientific notation.
Square root, cube root or any nth root of a number, with a verification check.
Log of a number in any base, with presets for 10, e and 2.
Remainder and quotient of a division, including the always-positive Euclidean modulo.
Daily calories plus protein, carb and fat grams from your body, activity and goal.
Estimate your 1RM from weight and reps, with a training-percentage table.
Healthy weight estimate for your height and sex from four classic formulas.
Estimate body fat from tape measurements (US Navy method), with category and lean mass.
Daily water target from your weight and exercise, in litres, cups and ounces.
Max heart rate and five training zones in bpm, with optional Karvonen method.
Daily calorie deficit and weekly loss to hit a goal weight in your timeframe.
Estimate your fertile window, ovulation day and next periods from your cycle.
How much paint a room needs from its size, coats and coverage. Litres and gallons.
How many tiles you need from the area and tile size, plus a waste allowance.
Concrete volume for a slab and the number of pre-mix bags needed.
How many boxes of laminate or vinyl flooring you need from area and coverage.
Total questions + number wrong → percentage score and letter grade, instantly.
What you need to score on the final to hit your target grade.
Overall grade from categories with different weights (homework, quizzes, exams).
Solve a/b = c/d for the missing value by cross-multiplication (rule of three).
Split a length by the golden ratio (φ ≈ 1.618), or find the matching part.
Count significant figures in a number and round to N sig figs. For science and homework.
Convert centimeters to inches (1 centimeter = 0.393701 in). Live result + reference table.
Convert inches to centimeters (1 inch = 2.54 cm). Live result + reference table.
Convert millimeters to inches (1 millimeter = 0.03937 in). Live result + reference table.
Convert inches to millimeters (1 inch = 25.4 mm). Live result + reference table.
Convert feet to meters (1 foot = 0.3048 m). Live result + reference table.
Convert meters to feet (1 meter = 3.28084 ft). Live result + reference table.
Convert kilometers to miles (1 kilometer = 0.621371 mi). Live result + reference table.
Convert miles to kilometers (1 mile = 1.60934 km). Live result + reference table.
Convert centimeters to feet (1 centimeter = 0.032808 ft). Live result + reference table.
Convert feet to centimeters (1 foot = 30.48 cm). Live result + reference table.
Convert meters to yards (1 meter = 1.09361 yd). Live result + reference table.
Convert yards to meters (1 yard = 0.9144 m). Live result + reference table.
Convert kilograms to pounds (1 kilogram = 2.20462 lb). Live result + reference table.
Convert pounds to kilograms (1 pound = 0.453592 kg). Live result + reference table.
Convert grams to ounces (1 gram = 0.035274 oz). Live result + reference table.
Convert ounces to grams (1 ounce = 28.3495 g). Live result + reference table.
Convert kilograms to stone (1 kilogram = 0.157473 st). Live result + reference table.
Convert stone to kilograms (1 stone = 6.35029 kg). Live result + reference table.
Convert pounds to ounces (1 pound = 16 oz). Live result + reference table.
Convert ounces to pounds (1 ounce = 0.0625 lb). Live result + reference table.
Convert liters to US gallons (1 liter = 0.264172 gal). Live result + reference table.
Convert US gallons to liters (1 US gallon = 3.78541 L). Live result + reference table.
Convert milliliters to US cups (1 milliliter = 0.004227 cup). Live result + reference table.
Convert US cups to milliliters (1 US cup = 236.588 ml). Live result + reference table.
Convert miles per hour to kilometers per hour (1 mile per hour = 1.60934 km/h). Live result + reference table.
Convert kilometers per hour to miles per hour (1 kilometer per hour = 0.621371 mph). Live result + reference table.
Convert megabytes to gigabytes (1 megabyte = 0.001 GB). Live result + reference table.
Convert gigabytes to megabytes (1 gigabyte = 1000 MB). Live result + reference table.
Convert kilobytes to megabytes (1 kilobyte = 0.001 MB). Live result + reference table.
Convert megabytes to kilobytes (1 megabyte = 1000 KB). Live result + reference table.
Convert Celsius to Fahrenheit (multiply by 9/5 and add 32). Live result + reference table.
Convert Fahrenheit to Celsius (subtract 32, then multiply by 5/9). Live result + reference table.
Convert Celsius to Kelvin (add 273.15). Live result + reference table.
Convert Kelvin to Celsius (subtract 273.15). Live result + reference table.
Convert millimeters to centimeters (1 millimeter = 0.1 cm). Live result + reference table.
Convert centimeters to millimeters (1 centimeter = 10 mm). Live result + reference table.
Convert kilometers to feet (1 kilometer = 3280.84 ft). Live result + reference table.
Convert feet to kilometers (1 foot = 0.000305 km). Live result + reference table.
Convert miles to yards (1 mile = 1760 yd). Live result + reference table.
Convert yards to miles (1 yard = 0.000568 mi). Live result + reference table.
Convert yards to feet (1 yard = 3 ft). Live result + reference table.
Convert feet to yards (1 foot = 0.333333 yd). Live result + reference table.
Convert miles to feet (1 mile = 5280 ft). Live result + reference table.
Convert feet to miles (1 foot = 0.000189 mi). Live result + reference table.
Convert milligrams to grams (1 milligram = 0.001 g). Live result + reference table.
Convert grams to milligrams (1 gram = 1000 mg). Live result + reference table.
Convert tonnes to kilograms (1 tonne = 1000 kg). Live result + reference table.
Convert kilograms to tonnes (1 kilogram = 0.001 t). Live result + reference table.
Convert grams to pounds (1 gram = 0.002205 lb). Live result + reference table.
Convert pounds to grams (1 pound = 453.592 g). Live result + reference table.
Convert ounces to kilograms (1 ounce = 0.02835 kg). Live result + reference table.
Convert kilograms to ounces (1 kilogram = 35.274 oz). Live result + reference table.
Convert tablespoons to milliliters (1 tablespoon = 14.7868 ml). Live result + reference table.
Convert milliliters to tablespoons (1 milliliter = 0.067628 tbsp). Live result + reference table.
Convert teaspoons to milliliters (1 teaspoon = 4.92892 ml). Live result + reference table.
Convert milliliters to teaspoons (1 milliliter = 0.202884 tsp). Live result + reference table.
Convert US pints to milliliters (1 US pint = 473.176 ml). Live result + reference table.
Convert milliliters to US pints (1 milliliter = 0.002113 pt). Live result + reference table.
Convert US quarts to liters (1 US quart = 0.946353 L). Live result + reference table.
Convert liters to US quarts (1 liter = 1.05669 qt). Live result + reference table.
Convert US fluid ounces to milliliters (1 US fluid ounce = 29.5735 ml). Live result + reference table.
Convert milliliters to US fluid ounces (1 milliliter = 0.033814 fl oz). Live result + reference table.
Convert knots to kilometers per hour (1 knot = 1.852 km/h). Live result + reference table.
Convert kilometers per hour to knots (1 kilometer per hour = 0.539957 kn). Live result + reference table.
Convert knots to miles per hour (1 knot = 1.15078 mph). Live result + reference table.
Convert miles per hour to knots (1 mile per hour = 0.868976 kn). Live result + reference table.
Convert meters per second to kilometers per hour (1 meter per second = 3.6 km/h). Live result + reference table.
Convert kilometers per hour to meters per second (1 kilometer per hour = 0.277778 m/s). Live result + reference table.
Convert feet per second to miles per hour (1 foot per second = 0.681818 mph). Live result + reference table.
Convert miles per hour to feet per second (1 mile per hour = 1.46667 ft/s). Live result + reference table.
Convert gigabytes to terabytes (1 gigabyte = 0.001 TB). Live result + reference table.
Convert terabytes to gigabytes (1 terabyte = 1000 GB). Live result + reference table.
Convert bytes to kilobytes (1 byte = 0.001 KB). Live result + reference table.
Convert kilobytes to bytes (1 kilobyte = 1000 B). Live result + reference table.
Convert bits to bytes (1 bit = 0.125 B). Live result + reference table.
Convert bytes to bits (1 byte = 8 bit). Live result + reference table.
Convert square meters to square feet (1 square meter = 10.7639 ft²). Live result + reference table.
Convert square feet to square meters (1 square foot = 0.092903 m²). Live result + reference table.
Convert acres to hectares (1 acre = 0.404686 ha). Live result + reference table.
Convert hectares to acres (1 hectare = 2.47105 ac). Live result + reference table.
Convert square kilometers to square miles (1 square kilometer = 0.386102 mi²). Live result + reference table.
Convert square miles to square kilometers (1 square mile = 2.58999 km²). Live result + reference table.
Convert square feet to square yards (1 square foot = 0.111111 yd²). Live result + reference table.
Convert square yards to square feet (1 square yard = 9 ft²). Live result + reference table.
Convert bar to psi (1 bar = 14.5038 psi). Live result + reference table.
Convert psi to bar (1 psi = 0.068948 bar). Live result + reference table.
Convert psi to kilopascals (1 psi = 6.89476 kPa). Live result + reference table.
Convert kilopascals to psi (1 kilopascal = 0.145038 psi). Live result + reference table.
Convert atmospheres to bar (1 atmosphere = 1.01325 bar). Live result + reference table.
Convert bar to atmospheres (1 bar = 0.986923 atm). Live result + reference table.
Convert kilocalories to kilojoules (1 kilocalorie = 4.184 kJ). Live result + reference table.
Convert kilojoules to kilocalories (1 kilojoule = 0.239006 kcal). Live result + reference table.
Convert calories to joules (1 calorie = 4.184 J). Live result + reference table.
Convert joules to calories (1 joule = 0.239006 cal). Live result + reference table.
Convert degrees to radians (1 degree = 0.017453 rad). Live result + reference table.
Convert radians to degrees (1 radian = 57.2958 deg). Live result + reference table.
Convert horsepower to kilowatts (1 horsepower = 0.7457 kW). Live result + reference table.
Convert kilowatts to horsepower (1 kilowatt = 1.34102 hp). Live result + reference table.
Convert meters to centimeters (1 meter = 100 cm). Live result + reference table.
Convert centimeters to meters (1 centimeter = 0.01 m). Live result + reference table.
Convert meters to inches (1 meter = 39.3701 in). Live result + reference table.
Convert inches to meters (1 inch = 0.0254 m). Live result + reference table.
Convert inches to yards (1 inch = 0.027778 yd). Live result + reference table.
Convert yards to inches (1 yard = 36 in). Live result + reference table.
Convert grams to kilograms (1 gram = 0.001 kg). Live result + reference table.
Convert kilograms to grams (1 kilogram = 1000 g). Live result + reference table.
Convert pounds to stone (1 pound = 0.071429 st). Live result + reference table.
Convert stone to pounds (1 stone = 14 lb). Live result + reference table.
Convert US cups to tablespoons (1 US cup = 16 tbsp). Live result + reference table.
Convert tablespoons to US cups (1 tablespoon = 0.0625 cup). Live result + reference table.
Convert tablespoons to teaspoons (1 tablespoon = 3 tsp). Live result + reference table.
Convert teaspoons to tablespoons (1 teaspoon = 0.333333 tbsp). Live result + reference table.
Convert US gallons to US cups (1 US gallon = 16 cup). Live result + reference table.
Convert US cups to US gallons (1 US cup = 0.0625 gal). Live result + reference table.
Convert US quarts to US cups (1 US quart = 4 cup). Live result + reference table.
Convert US cups to US quarts (1 US cup = 0.25 qt). Live result + reference table.
Convert US pints to US cups (1 US pint = 2 cup). Live result + reference table.
Convert US cups to US pints (1 US cup = 0.5 pt). Live result + reference table.
Convert liters to milliliters (1 liter = 1000 ml). Live result + reference table.
Convert milliliters to liters (1 milliliter = 0.001 L). Live result + reference table.
Convert kilobytes to gigabytes (1 kilobyte = 1e-06 GB). Live result + reference table.
Convert gigabytes to kilobytes (1 gigabyte = 1e+06 KB). Live result + reference table.
Convert megabytes to terabytes (1 megabyte = 1e-06 TB). Live result + reference table.
Convert terabytes to megabytes (1 terabyte = 1e+06 MB). Live result + reference table.
Convert square meters to acres (1 square meter = 0.000247 ac). Live result + reference table.
Convert acres to square meters (1 acre = 4046.86 m²). Live result + reference table.
Convert square yards to square meters (1 square yard = 0.836127 m²). Live result + reference table.
Convert square meters to square yards (1 square meter = 1.19599 yd²). Live result + reference table.
Convert kilowatt-hours to watt-hours (1 kilowatt-hour = 1000 Wh). Live result + reference table.
Convert watt-hours to kilowatt-hours (1 watt-hour = 0.001 kWh). Live result + reference table.
Convert kilocalories to calories (1 kilocalorie = 1000 cal). Live result + reference table.
Convert calories to kilocalories (1 calorie = 0.001 kcal). Live result + reference table.
Convert atmospheres to psi (1 atmosphere = 14.6959 psi). Live result + reference table.
Convert psi to atmospheres (1 psi = 0.068046 atm). Live result + reference table.
Convert horsepower to watts (1 horsepower = 745.7 W). Live result + reference table.
Convert watts to horsepower (1 watt = 0.001341 hp). Live result + reference table.
Convert seconds to minutes (1 second = 0.016667 min). Live result + reference table.
Convert minutes to seconds (1 minute = 60 s). Live result + reference table.
Convert minutes to hours (1 minute = 0.016667 hr). Live result + reference table.
Convert hours to minutes (1 hour = 60 min). Live result + reference table.
Convert hours to days (1 hour = 0.041667 d). Live result + reference table.
Convert days to hours (1 day = 24 hr). Live result + reference table.
Convert days to weeks (1 day = 0.142857 wk). Live result + reference table.
Convert weeks to days (1 week = 7 d). Live result + reference table.
Convert milliseconds to seconds (1 millisecond = 0.001 s). Live result + reference table.
Convert seconds to milliseconds (1 second = 1000 ms). Live result + reference table.
Convert megahertz to gigahertz (1 megahertz = 0.001 GHz). Live result + reference table.
Convert gigahertz to megahertz (1 gigahertz = 1000 MHz). Live result + reference table.
Convert kilohertz to megahertz (1 kilohertz = 0.001 MHz). Live result + reference table.
Convert megahertz to kilohertz (1 megahertz = 1000 kHz). Live result + reference table.
Convert hertz to kilohertz (1 hertz = 0.001 kHz). Live result + reference table.
Convert kilohertz to hertz (1 kilohertz = 1000 Hz). Live result + reference table.
Convert megabits per second to megabytes per second (1 megabit per second = 0.125 MB/s). Live result + reference table.
Convert megabytes per second to megabits per second (1 megabyte per second = 8 Mbps). Live result + reference table.
Convert gigabits per second to megabits per second (1 gigabit per second = 1000 Mbps). Live result + reference table.
Convert megabits per second to gigabits per second (1 megabit per second = 0.001 Gbps). Live result + reference table.
Convert megabits per second to kilobits per second (1 megabit per second = 1000 kbps). Live result + reference table.
Convert kilobits per second to megabits per second (1 kilobit per second = 0.001 Mbps). Live result + reference table.
Convert newton metres to foot-pounds (1 newton metre = 0.737562 ft·lb). Live result + reference table.
Convert foot-pounds to newton metres (1 foot-pound = 1.35582 N·m). Live result + reference table.
Convert newton metres to inch-pounds (1 newton metre = 8.85075 in·lb). Live result + reference table.
Convert inch-pounds to newton metres (1 inch-pound = 0.112985 N·m). Live result + reference table.
Convert foot-pounds to inch-pounds (1 foot-pound = 12 in·lb). Live result + reference table.
Convert inch-pounds to foot-pounds (1 inch-pound = 0.083333 ft·lb). Live result + reference table.
Convert newtons to pounds-force (1 newton = 0.224809 lbf). Live result + reference table.
Convert pounds-force to newtons (1 pound-force = 4.44822 N). Live result + reference table.
Convert kilograms-force to newtons (1 kilogram-force = 9.80665 N). Live result + reference table.
Convert newtons to kilograms-force (1 newton = 0.101972 kgf). Live result + reference table.
Convert kilonewtons to newtons (1 kilonewton = 1000 N). Live result + reference table.
Convert newtons to kilonewtons (1 newton = 0.001 kN). Live result + reference table.
Convert US gallons to US quarts (1 US gallon = 4 qt). Live result + reference table.
Convert US quarts to US gallons (1 US quart = 0.25 gal). Live result + reference table.
Convert US gallons to US pints (1 US gallon = 8 pt). Live result + reference table.
Convert US pints to US gallons (1 US pint = 0.125 gal). Live result + reference table.
Convert US quarts to US pints (1 US quart = 2 pt). Live result + reference table.
Convert US pints to US quarts (1 US pint = 0.5 qt). Live result + reference table.
Convert US cups to US fluid ounces (1 US cup = 8 fl oz). Live result + reference table.
Convert US fluid ounces to US cups (1 US fluid ounce = 0.125 cup). Live result + reference table.
Convert US gallons to US fluid ounces (1 US gallon = 128 fl oz). Live result + reference table.
Convert US fluid ounces to US gallons (1 US fluid ounce = 0.007812 gal). Live result + reference table.
Convert feet to inches (1 foot = 12 in). Live result + reference table.
Convert inches to feet (1 inch = 0.083333 ft). Live result + reference table.
Convert meters to millimeters (1 meter = 1000 mm). Live result + reference table.
Convert millimeters to meters (1 millimeter = 0.001 m). Live result + reference table.
Convert acres to square feet (1 acre = 43560 ft²). Live result + reference table.
Convert square feet to acres (1 square foot = 2.3e-05 ac). Live result + reference table.
Convert millimeters of mercury to kilopascals (1 millimeter of mercury = 0.133322 kPa). Live result + reference table.
Convert kilopascals to millimeters of mercury (1 kilopascal = 7.50062 mmHg). Live result + reference table.
Convert millimeters of mercury to psi (1 millimeter of mercury = 0.019337 psi). Live result + reference table.
Convert psi to millimeters of mercury (1 psi = 51.7149 mmHg). Live result + reference table.
Convert joules to kilojoules (1 joule = 0.001 kJ). Live result + reference table.
Convert kilojoules to joules (1 kilojoule = 1000 J). Live result + reference table.
Convert degrees to gradians (1 degree = 1.11111 gon). Live result + reference table.
Convert gradians to degrees (1 gradian = 0.9 deg). Live result + reference table.
Convert seconds to hours (1 second = 0.000278 hr). Live result + reference table.
Convert hours to seconds (1 hour = 3600 s). Live result + reference table.
Convert Fahrenheit to Kelvin (subtract 32, multiply by 5/9, then add 273.15). Live result + reference table.
Convert Kelvin to Fahrenheit (multiply by 9/5, then subtract 459.67). Live result + reference table.
Convert revolutions per minute to hertz (1 revolution per minute = 0.016667 Hz). Live result + reference table.
Convert hertz to revolutions per minute (1 hertz = 60 rpm). Live result + reference table.
Convert carats to grams (1 carat = 0.2 g). Live result + reference table.
Convert grams to carats (1 gram = 5 ct). Live result + reference table.
Convert short tons to kilograms (1 short ton = 907.185 kg). Live result + reference table.
Convert kilograms to short tons (1 kilogram = 0.001102 ton). Live result + reference table.
Convert short tons to pounds (1 short ton = 2000 lb). Live result + reference table.
Convert pounds to short tons (1 pound = 0.0005 ton). Live result + reference table.
Convert kilograms to milligrams (1 kilogram = 1e+06 mg). Live result + reference table.
Convert milligrams to kilograms (1 milligram = 1e-06 kg). Live result + reference table.
Convert BTU to kilojoules (1 BTU = 1.05506 kJ). Live result + reference table.
Convert kilojoules to BTU (1 kilojoule = 0.947817 BTU). Live result + reference table.
Convert BTU to watt-hours (1 BTU = 0.293071 Wh). Live result + reference table.
Convert watt-hours to BTU (1 watt-hour = 3.41214 BTU). Live result + reference table.
Convert terabytes to petabytes (1 terabyte = 0.001 PB). Live result + reference table.
Convert petabytes to terabytes (1 petabyte = 1000 TB). Live result + reference table.
Convert bytes to megabytes (1 byte = 1e-06 MB). Live result + reference table.
Convert megabytes to bytes (1 megabyte = 1e+06 B). Live result + reference table.
Convert bytes to gigabytes (1 byte = 0 GB). Live result + reference table.
Convert gigabytes to bytes (1 gigabyte = 1e+09 B). Live result + reference table.
Convert kilowatts to watts (1 kilowatt = 1000 W). Live result + reference table.
Convert watts to kilowatts (1 watt = 0.001 kW). Live result + reference table.
Convert megawatts to kilowatts (1 megawatt = 1000 kW). Live result + reference table.
Convert kilowatts to megawatts (1 kilowatt = 0.001 MW). Live result + reference table.
Convert square feet to square inches (1 square foot = 144 in²). Live result + reference table.
Convert square inches to square feet (1 square inch = 0.006944 ft²). Live result + reference table.
Convert square meters to square centimeters (1 square meter = 10000 cm²). Live result + reference table.
Convert square centimeters to square meters (1 square centimeter = 0.0001 m²). Live result + reference table.
Convert meters per second to miles per hour (1 meter per second = 2.23694 mph). Live result + reference table.
Convert miles per hour to meters per second (1 mile per hour = 0.44704 m/s). Live result + reference table.
Convert feet per second to meters per second (1 foot per second = 0.3048 m/s). Live result + reference table.
Convert meters per second to feet per second (1 meter per second = 3.28084 ft/s). Live result + reference table.
Convert knots to meters per second (1 knot = 0.514444 m/s). Live result + reference table.
Convert meters per second to knots (1 meter per second = 1.94384 kn). Live result + reference table.
Convert psi to pascals (1 psi = 6894.76 Pa). Live result + reference table.
Convert pascals to psi (1 pascal = 0.000145 psi). Live result + reference table.
Convert nautical miles to kilometers (1 nautical mile = 1.852 km). Live result + reference table.
Convert kilometers to nautical miles (1 kilometer = 0.539957 nmi). Live result + reference table.
Convert nautical miles to miles (1 nautical mile = 1.15078 mi). Live result + reference table.
Convert miles to nautical miles (1 mile = 0.868976 nmi). Live result + reference table.
Convert US pints to liters (1 US pint = 0.473176 L). Live result + reference table.
Convert liters to US pints (1 liter = 2.11338 pt). Live result + reference table.
Convert US fluid ounces to liters (1 US fluid ounce = 0.029574 L). Live result + reference table.
Convert liters to US fluid ounces (1 liter = 33.814 fl oz). Live result + reference table.
Convert liters to US cups (1 liter = 4.22675 cup). Live result + reference table.
Convert US cups to liters (1 US cup = 0.236588 L). Live result + reference table.
Convert US gallons to milliliters (1 US gallon = 3785.41 ml). Live result + reference table.
Convert milliliters to US gallons (1 milliliter = 0.000264 gal). Live result + reference table.
Convert US quarts to milliliters (1 US quart = 946.353 ml). Live result + reference table.
Convert milliliters to US quarts (1 milliliter = 0.001057 qt). Live result + reference table.
Convert square miles to acres (1 square mile = 640 ac). Live result + reference table.
Convert acres to square miles (1 acre = 0.001563 mi²). Live result + reference table.
Convert acres to square yards (1 acre = 4840 yd²). Live result + reference table.
Convert square yards to acres (1 square yard = 0.000207 ac). Live result + reference table.
Convert square kilometers to hectares (1 square kilometer = 100 ha). Live result + reference table.
Convert hectares to square kilometers (1 hectare = 0.01 km²). Live result + reference table.
Convert square meters to square kilometers (1 square meter = 1e-06 km²). Live result + reference table.
Convert square kilometers to square meters (1 square kilometer = 1e+06 m²). Live result + reference table.
Convert pascals to kilopascals (1 pascal = 0.001 kPa). Live result + reference table.
Convert kilopascals to pascals (1 kilopascal = 1000 Pa). Live result + reference table.
Convert millimeters of mercury to atmospheres (1 millimeter of mercury = 0.001316 atm). Live result + reference table.
Convert atmospheres to millimeters of mercury (1 atmosphere = 760 mmHg). Live result + reference table.
Convert BTU to kilowatt-hours (1 BTU = 0.000293 kWh). Live result + reference table.
Convert kilowatt-hours to BTU (1 kilowatt-hour = 3412.14 BTU). Live result + reference table.
Convert seconds to days (1 second = 1.2e-05 d). Live result + reference table.
Convert days to seconds (1 day = 86400 s). Live result + reference table.
Convert hours to weeks (1 hour = 0.005952 wk). Live result + reference table.
Convert weeks to hours (1 week = 168 hr). Live result + reference table.
Convert tonnes to pounds (1 tonne = 2204.62 lb). Live result + reference table.
Convert pounds to tonnes (1 pound = 0.000454 t). Live result + reference table.
Convert carats to milligrams (1 carat = 200 mg). Live result + reference table.
Convert milligrams to carats (1 milligram = 0.005 ct). Live result + reference table.
Convert knots to feet per second (1 knot = 1.68781 ft/s). Live result + reference table.
Convert feet per second to knots (1 foot per second = 0.592484 kn). Live result + reference table.
Convert radians to gradians (1 radian = 63.662 gon). Live result + reference table.
Convert gradians to radians (1 gradian = 0.015708 rad). Live result + reference table.
Convert pounds-force to kilograms-force (1 pound-force = 0.453592 kgf). Live result + reference table.
Convert kilograms-force to pounds-force (1 kilogram-force = 2.20462 lbf). Live result + reference table.
Convert gigabits per second to megabytes per second (1 gigabit per second = 125 MB/s). Live result + reference table.
Convert megabytes per second to gigabits per second (1 megabyte per second = 0.008 Gbps). Live result + reference table.
Convert miles to meters (1 mile = 1609.34 m). Live result + reference table.
Convert meters to miles (1 meter = 0.000621 mi). Live result + reference table.
Convert gigabytes to petabytes (1 gigabyte = 1e-06 PB). Live result + reference table.
Convert petabytes to gigabytes (1 petabyte = 1e+06 GB). Live result + reference table.
Convert grams per cubic centimetre to kilograms per cubic metre (1 gram per cubic centimetre = 1000 kg/m³). Live result + reference table.
Convert kilograms per cubic metre to grams per cubic centimetre (1 kilogram per cubic metre = 0.001 g/cm³). Live result + reference table.
Convert grams per cubic centimetre to pounds per cubic foot (1 gram per cubic centimetre = 62.428 lb/ft³). Live result + reference table.
Convert pounds per cubic foot to grams per cubic centimetre (1 pound per cubic foot = 0.016018 g/cm³). Live result + reference table.
Convert foot-candles to lux (1 foot-candle = 10.7639 lx). Live result + reference table.
Convert lux to foot-candles (1 lux = 0.092903 fc). Live result + reference table.
Calculate exact age or difference between two dates. Years, months, days, weeks, hours, minutes.
Three timers in one. Work sessions, accurate stopwatch, countdown. Notifications for background tabs.
Unix timestamp to human date and back. Live clock, relative time, seconds or milliseconds.
Paste any cron expression and see it in plain English plus the next 5 run times.
Convert times between any zones. Live world clock for your favorite cities.
Count business days between two dates. Skips weekends, with optional public-holiday exclusions.
Date ↔ ordinal day (1-366), ISO 8601 week number, quarter, days remaining in year, year progress %.
Live days / hours / minutes / seconds to any future date. Presets for New Year, Christmas, custom moment.
Convert between ISO 8601, US, EU, RFC 2822, Unix timestamps. Edit any field — all others update live.
Project-deadline math — add/subtract days, weeks, months, years. Business-day mode skips weekends.
Sunrise + sunset + day length + twilight phases for any lat / lng / date. NOAA algorithm.
Current moon phase + illumination + next full / new moon dates. Pick any date.
Exact duration between two dates and times, broken into days/hours/minutes and totals.
Is a year a leap year? See the rule and the next leap years.
What weekday is any date? ‘What day was I born’ — past or future.
ISO 8601 week number for any date — Monday-start, first-Thursday rule.
Birth date → western star sign, with symbol, element and date range.
Birth year → Chinese zodiac animal + element (Metal Rat, Wood Dragon…).
Dog/cat age → human years, size-aware (not the ×7 myth).
Clean monthly calendar for any month/year, Monday or Sunday start, print-ready.
How many days a month has, plus its first and last weekday and leap-year February.
The birthstone and birth flower for any month, with their meaning.
Which quarter a date is in (calendar or fiscal), with the range and days left.
Calculate tips and split the bill between any number of people. Multi-currency, instant results.
Monthly payment, total interest, and full amortization schedule. Multi-currency, with extra payment scenarios.
Convert between hourly, daily, weekly, monthly and yearly pay. Configurable hours per week and weeks off.
Calculate compound growth of an investment over time with optional monthly contributions and annual growth rate.
Work out the final price after a discount, the original price from a sale price, or the discount percentage saved.
Net ↔ gross with country presets. Germany 19%, UK 20%, Austria 20%, and more. Bidirectional input.
Cost + price → margin & markup, or cost + target margin → selling price. For Etsy, Amazon, Shopify sellers.
Calculate your minimum freelance rate from take-home goal, tax, overhead, working days and billable ratio.
How much to save monthly to reach a goal, or how long it takes at your current rate. Compound interest baked in.
Future or past purchasing power. What $100 in 1990 is worth now, or what $5k today buys in 20 years.
Return on investment — ROI %, net profit, annualised %. Compare projects of different durations fairly.
Assets minus liabilities, line-by-line. Multi-currency. Your numbers never leave the browser.
PayPal / Stripe / Wise fees and net payout, plus reverse 'charge to receive X'.
Break-even units and revenue from fixed costs, price and variable cost per unit.
Down payment, loan amount and LTV from price and percentage.
Fee & net from a charge, or gross-up to receive an exact amount.
Split take-home pay into needs (50%), wants (30%), savings (20%).
Snowball vs avalanche payoff plan for multiple debts: months to clear and total interest.
Months and interest to clear a card balance, or the payment to clear it by a date.
Monthly mortgage payment with principal, interest, tax, insurance and PMI, plus total interest.
Years to double, triple or quadruple your money at a given rate of return.
Convert between APR (nominal) and APY (effective) for any compounding frequency.
Generate strong, random passwords. Configurable length, symbols, look-alike exclusion. Cryptographically secure.
Entropy in bits, estimated online + offline crack time, common-pattern detection. Password never leaves the browser.
Memorable + cryptographically strong passphrases from the EFF wordlist. Entropy bits shown — runs in your browser.
MD5, SHA-1, SHA-256, SHA-512. Works on text or any file. Computed locally in your browser.
HMAC-SHA1/SHA-256/SHA-384/SHA-512 for API signing, JWT, webhook verification. Hex or Base64 output.
Decode JSON Web Tokens. See header, payload, and signature. Human-readable exp/iat timestamps.
Build and sign JSON Web Tokens with HS256/HS384/HS512 in your browser. Pairs with the existing JWT decoder.
Hash passwords with bcrypt at adjustable cost, or verify a password against an existing hash. Runs locally.
Create Apache and Nginx .htpasswd entries. Choose bcrypt or APR1 MD5. Copy the full one-line entry.
Classic letter-shift cipher with live preview. Any shift from 1 to 25, plus the ROT13 default. Both directions.
AES-GCM-256 with PBKDF2 key derivation. Browser-native via SubtleCrypto — password + plaintext stay local.
Generate Google-Authenticator-compatible 2FA codes from a base32 secret. RFC 6238. Live countdown.
Encode/decode text with the Vigenere keyword cipher. Two-way, live, browser-only.
Secure random API keys and tokens: hex, Base64, Base64URL or alphanumeric, bulk.
Encrypt/decrypt by shifting letters any amount (0–25). ROT13 included, live output.
Mirror the alphabet (A↔Z, B↔Y…). Self-inverse, keeps case & punctuation.
XOR text with a repeating key → hex, and back. UTF-8 aware, fully client-side.
SHA-256 / SHA-1 / SHA-512 checksum of a file, with optional compare. No upload.
Encode/decode the rail fence (zigzag) transposition cipher with any number of rails.
Convert letters to alphabet numbers (A=1 … Z=26) and back. Common puzzle cipher.
Encode/decode the Baconian cipher (each letter as five A's and B's).
Encode/decode the affine cipher (a·x + b mod 26) with a coprime multiplier.
Encode/decode the Polybius square (letters to row-column digit pairs, I/J shared).
Encode/decode the keyword columnar transposition cipher.
Generate permanent QR codes for free. No redirects, no expiration, no tracking. Works forever.
Pick random names from a list, generate numbers, flip coins, roll dice. Truly random, not pseudo-random.
Generate fake users, addresses, dates for prototyping. Export as JSON, CSV, NDJSON, SQL, or TypeScript.
Roll any combo of D4, D6, D8, D10, D12, D20, D100. D&D-style dice notation supported (e.g. 3d6+2).
Flip a virtual coin. Run single flips or batches of 100 and see the streak and heads/tails ratio.
Convert between text and Morse code instantly. International Morse alphabet, optional audio playback.
Themed random handles — gamer, professional, cute, dev, dark. Style (snake/camel/pascal) and number suffix.
GitHub-style abstract avatars from any text. Hash-derived, deterministic. Download PNG or SVG.
Solid-color PNG/JPG with dimension labels. Custom colors, preset sizes for HD, IG square, Story, OG image.
Letter on a colored circle / square — Gmail / Slack style. Custom colors, shapes, sizes. PNG + SVG export.
Tailwind-style 50-900 palette from any base color. HEX / RGB / HSL, copy CSS variables or Tailwind config.
Free browser notepad with autosave to localStorage. No account, no upload — your notes stay private.
Random name picker with animation. Class raffles, giveaways, team decisions. Crypto-secure randomness.
Random Yes / No / Maybe with one click. Plus custom options mode. The trick is noticing your reaction.
Type a word, get giant block-letter ASCII art. Multiple styles. Copy-paste into terminals, READMEs, banners.
Spell text in Alpha-Bravo-Charlie. For reading codes and names clearly over the phone.
Generate Code128, EAN, UPC, Code39 barcodes. Download as PNG or SVG, browser-only.
Shuffle a list into random order, dedupe, or pick a random subset. Crypto-random.
Generate random colors (hex/RGB/HSL) or a whole palette. One-click copy.
Split a list of names into random balanced teams. Crypto-random, fair.
Random gift-exchange pairings where nobody gets themselves. Paste names, draw.
Single-elimination bracket from a participant list. Random seeding, auto byes.
Random 'Would You Rather' questions for parties, road trips and icebreakers.
Ask a yes/no question, get one of the classic 20 Magic 8 Ball answers.
Secure random numeric PINs of any length, generated in your browser.
Generate random full names (gender + count) for test data, characters, mock-ups.
Funny placeholder text — pirate, hipster or corporate-buzzword style.
QR code that connects phones to your Wi-Fi by scanning, no password typing.
Contact QR code that saves your details to a phone, for business cards and signatures.
Realistic fake people (name, email, phone, address, job) for test data and demos.
Random lottery picks with presets for popular games or your own custom range.
Play rock paper scissors against the computer and keep score.
Generate random English words for brainstorming, games and writing prompts.
Decode QR codes from an image or your camera, in the browser. Reads the text or link inside.
Scan EAN / UPC / Code 128 barcodes from an image or camera. Reads the number inside.
Browse and copy Japanese text faces (¯\_(ツ)_/¯) by mood. Click to copy.
Format, validate, minify, and sort JSON. Error messages with line numbers. Escape and unescape strings.
Encode and decode Base64. Works with text and files. URL-safe variant supported.
Convert between CSV and JSON. Handles quoted fields, custom delimiters, auto-detects direction.
Format messy SQL queries. Indented clauses, keyword case, comma style. Handles comments and strings correctly.
Compare two JSON documents structurally. See added, removed, and changed values per path.
Paste a JSON sample, get a JSON Schema. Auto-detects types, formats, enums, required fields.
Convert YAML to JSON or JSON to YAML. Format and validate. Handles anchors, aliases, multi-line strings.
Format, minify, and convert XML. Handles attributes, namespaces, CDATA, processing instructions.
Every HTTP status code with common causes and what to do. Searchable, filterable, jump-by-code.
Collapse whitespace, strip comments and inline CSS/JS — or beautify back with consistent indentation.
Strip comments and whitespace for production, or re-expand minified CSS into readable indented form.
Compact JavaScript by removing comments and whitespace, or format minified JS with consistent indentation.
Break any URL into protocol, host, port, path, query, fragment. See each query param on its own line. Decode on.
Paste any User-Agent string to see the browser, engine, OS and device it identifies as. Detects major edge cases.
Encode and decode URL components. Parse query strings into a readable table.
Test JavaScript regex with live match highlighting, capture groups, and replace.
Encode special characters to HTML entities and back. Named or numeric, safe or full.
Convert text to 8-bit binary and back. UTF-8 aware so emojis and accents round-trip correctly.
Generate cryptographically random v4 UUIDs. Batch up to 1000 at a time. Multiple formats.
Combine curated templates for languages, frameworks, IDEs, and operating systems. Inlined, no external fetches.
Calculate IPv4 subnet ranges, masks, host counts, and binary representations from any CIDR notation.
Convert between octal, symbolic, and chmod commands. Visual checkboxes for user/group/other.
See how your page appears in Google — desktop + mobile snippets with title (60 char) and description (155 char) truncation.
Visual builder for robots.txt — user-agent rules, allow / disallow paths, sitemap link, crawl-delay. Block AI crawlers preset.
Paste URLs — get a valid sitemap.xml with lastmod, changefreq, priority. Download as file.
JSON-LD for Article, FAQ, Product, LocalBusiness, Recipe, HowTo, Event, Organization, BreadcrumbList.
Paste Markdown — get a table of contents with GitHub-style anchor links. Configurable depth.
Write JSONPath queries ($.foo[*].bar), see matches live. Filter expressions + slices supported.
Generate TypeScript interfaces from JSON with inferred types and nested interfaces.
Convert HTML to React JSX — className, style objects, self-closing tags, camelCased attributes.
Build a copy-paste curl command from a form: method, URL, headers, JSON body, auth.
Escape or unescape strings for JSON, JS, HTML, URL and backslash sequences. Two-way.
Generate Nano IDs and sortable ULIDs in bulk. Cryptographically random, URL-safe.
Minify SVG, strip editor cruft + metadata, export as optimized SVG, CSS data-URI or img tag.
Luhn-valid fake card numbers for testing payment forms. Visa/MC/Amex/Discover. Validator too.
Bitcoin-style Base58 (no confusing 0 O I l). Encode text or decode back. Two-way.
Generate dynamic Discord
Build HTML table markup: rows, columns, header row, borders, striping. Live preview.
HTTP status code + full redirect chain (301 → 200) for any URL. Find broken links.
Inspect any URL's response headers + security-header checklist (HSTS, CSP, XFO).
File extension ↔ Content-Type MIME lookup, searchable reference table.
ASCII reference: decimal, hex, octal, binary and character for every code.
AND/OR/XOR/NOT and bit shifts on two integers, shown in dec, hex and binary.
IPv4 ↔ binary, hex and 32-bit integer.
Convert JSON to Go structs with json tags and inferred types.
Live-render pasted HTML in a sandboxed iframe. Test snippets and markup instantly.
Convert text to hexadecimal bytes and hex back to text. UTF-8 aware.
Encode/decode text ↔ RFC 4648 Base32, UTF-8 aware, fully client-side.
Convert dotenv files to JSON and back. Handles comments & quoted values.
Generate random MAC addresses — pick separator, case and count.
Generate Python @dataclass definitions from JSON, with nested classes & types.
Generate serde Rust structs from JSON — inferred types, snake_case, nested.
Generate Kotlin data classes from JSON — inferred types, nested classes.
Generate an Apache .htaccess — HTTPS, www, gzip, caching, error pages.
Pick a task → the exact git command + a plain explanation (undo, branch, stash…).
Format & indent GraphQL queries, mutations and schemas — even minified input.
Edit CSV in a table — add/remove rows & columns, export. Handles quoted fields.
Generate sortable 26-char ULIDs with an embedded timestamp, a UUID alternative.
Compact URL-safe random IDs with custom length and alphabet, a UUID alternative.
Generate a ready-to-use LICENSE file (MIT, ISC, BSD, Unlicense) with your name and year.
Generate an .editorconfig file for consistent indentation and whitespace across editors.
Validate an IBAN with the mod-97 checksum and country length, formatted for reading.
Validate ISBN-10 / ISBN-13 by check digit and convert between the two formats.
Encode/decode text ↔ Ascii85 (Base85), more compact than Base64. UTF-8 aware.
Explore JSON as a collapsible, colour-coded tree. Great for large API payloads.
Convert INI config files to JSON and back. Handles sections and comments.
Flatten nested JSON to dot-notation keys and unflatten back. For configs and i18n.
Convert JSON Lines (NDJSON) to a JSON array and back. For logs and data pipelines.
Parse a URL query string into JSON and build one back. Handles encoding and arrays.
Per-character Unicode code point, HTML entity, and UTF-8/UTF-16 bytes. Handles emoji.
Click speed test, how many clicks per second can you do? 1, 5 and 10 second modes.
Test your reflexes, wait for green then click fast, see your reaction time in ms.
Press keys to check they work, shows key name, JS code and keyCode, plus held keys.
Fullscreen solid colors to find dead or stuck pixels on any screen.
Your screen resolution, viewport, pixel ratio, aspect ratio and color depth.
Show your browser's User-Agent string, browser, OS and languages with one-click copy.
Check your camera works with a live preview and snapshot. Nothing is uploaded.
Check your microphone picks up sound with a live level meter. Nothing is uploaded.
Test controller buttons and sticks live in the browser. Xbox, PlayStation, USB pads.
Test a touchscreen or trackpad: live contact points, coordinates and multi-touch count.
Adjustable-tempo metronome with time signature, accented downbeat and visual beat.
Tap along to a song to find its tempo (BPM), averaged over recent taps.
Sine / square / triangle / sawtooth tones at any Hz. Speaker test, hearing test, tuning reference.
Play a tone gliding between two frequencies, linear or logarithmic, any waveform.
Generate binaural beats with brainwave presets or custom frequencies. Use headphones.
Play white, pink or brown noise for focus or sleep, with volume and a timer.
Play telephone keypad touch-tones (DTMF), single keys or a whole dialed number.
Find the highest frequency you can hear, with age reference points. Fun, not medical.
Record from your mic, download as WebM or MP4. Pause / resume. Browser-only — no upload.
Cut a clip from an audio file by start/end time, download as WAV. In your browser.
Duration, sample rate, channels and bitrate of an audio file. Decoded locally, no upload.
Hear typed text spoken aloud via Web Speech API. Pick voice + rate + pitch + volume. Local OS voices.
Speak into your mic, watch text appear. 60+ languages. Chrome / Edge / Brave / Chromium browsers.
Decode a 4, 5 or 6-band resistor into resistance, tolerance and temp coefficient, or look up bands for a value.
Find the series resistor for an LED from supply, forward voltage and current, with the nearest E12 value.
Total resistance for any number of resistors in series (sum) and in parallel (reciprocal) at once.
Output voltage of a resistive divider, or solve for a resistor to hit a target, plus the divider current.
Enter any 2 of V, I, R, P → get the other two. V=I·R, P=V·I.
Frequency, period and duty cycle for a 555 in astable mode, or pulse width in monostable, from R1, R2, C.
Decode the 3-digit code on a ceramic capacitor (like 104 or 223) into pF, nF and µF, with tolerance.
The -3dB cutoff of a first-order RC low-pass or high-pass filter, or solve for R or C from a target.
Resonant frequency of an LC tank circuit from L and C, or solve for L or C to tune to a target.
Convert a power or voltage ratio to decibels and back (10·log for power, 20·log for voltage).
Estimate runtime from battery capacity (mAh / Ah) and device current draw, with a derating factor.
Near, far and total depth of field from focal length, aperture, distance and sensor.
Hyperfocal distance for maximum depth of field, by focal length, aperture and sensor.
Angle of view and frame width from focal length and sensor size.
35mm-equivalent focal length and aperture for any sensor crop factor.
Exposure value from aperture, shutter and ISO, plus scene light value.
New shutter speed after an ND filter, by stops or filter number.
Flash distance or aperture from guide number and ISO.
Frames, clip length and storage for a time-lapse shoot.
Longest shutter before star trails, by focal length and crop factor.
Print size from pixels and DPI, or the pixels a print needs.
Half-wave dipole length (total and each leg) for any frequency.
Radiator and radial lengths for a quarter-wave ground-plane vertical.
Total and side length of a full-wave delta or quad loop.
Radiator and matching-stub lengths for a J-pole VHF/UHF antenna.
EFHW wire length plus the harmonic bands it also covers.
Starting-point reflector, driven and director lengths plus spacing for a Yagi.
SWR to reflection coefficient, return loss, mismatch loss and reflected power.
dBi to dBd, and ERP / EIRP from power, feedline loss and gain.
Convert RF power between dBm, watts, milliwatts and dBW.
Physical length of a quarter or half-wave coax stub, by velocity factor.
Frequency to wavelength in metres, feet and inches, plus the ham band.
Lowest-lobe elevation angle of a horizontal antenna from its height over ground.
Loaded Q and fractional bandwidth from centre frequency and bandwidth.
Grid locator to lat/long, plus distance and beam heading to another grid.
Real cost of a print: filament used, electricity and a failure allowance.
Convert filament grams to metres and back, per material and diameter.
Weigh a spool to see the grams and metres left, and if your print fits.
Cost of an SLA/MSLA print from ml used, bottle price and waste allowance.
Corrected extruder steps/mm from a measured 100 mm extrusion test.
Corrected slicer flow / extrusion multiplier from a measured single wall.
Scale factor and compensated size so a print shrinks to the target dimension.
mm³/s from layer height x line width x speed, vs your hotend melt limit.
Magnification, exit pupil and useful range from scope, eyepiece and Barlow.
Solve focal length, aperture or f/number from the other two.
Sky the eyepiece shows: apparent field / magnification, with Moon widths.
Exit pupil from aperture / magnification or eyepiece / focal ratio.
Telescope resolving power (Dawes 116/D, Rayleigh 138/D) from aperture.
Faintest stars a telescope shows, plus light grasp vs the naked eye.
Convert light-years, parsecs, AU, km and miles, with light travel time.
Arcsec/pixel, sensor field of view and sampling verdict for astrophotography.
Note values in ms and Hz for any tempo — delay, pre-delay and LFO sync times.
Note to Hz and Hz to nearest note (with cents), adjustable A4 reference.
Interval between two frequencies in cents and semitones, or cents to ratio.
Loop length in seconds, samples and file size from bars, BPM and sample rate.
Key ↔ Camelot code with the harmonically compatible keys for DJ mixing.
BPM change to speed ratio, vari-speed pitch shift in semitones and new length.
SharpDev.Tools is a curated collection of 785 free online tools for developers, writers, designers and content creators — organized into 24 categories covering text, code, design, PDFs, images, calculators, generators, social-media counters and developer utilities. Every tool runs in your browser; no upload, no sign-up, no ads, no cookies.
Yes — every tool is free, with no sign-up, no ads, no usage limits, no premium tier. SharpDev.Tools is funded entirely by side-project budget; there are no paywalls or upsells.
No. There is no account system on SharpDev.Tools. Open any tool URL and use it immediately.
No. Every tool runs entirely in your browser via JavaScript / WebAssembly. Even PDF tools, image processing, OCR and cryptography happen locally. The only exceptions are tools that explicitly fetch from a public API (e.g. YouTube thumbnail downloader) — those make the API call from your browser, not a server.
No cookies. Zero cookies, no consent banner needed. The site uses privacy-friendly aggregate analytics (Plausible) to measure pageviews — no personal data, no cross-site tracking, GDPR-compliant by design.
Every tool page has a 'Found a bug?' section that opens a quick form. For new-tool requests, the Request page lets you describe what you'd like to see built.
Social Media
9 toolsHashtag Generator
Enter a topic and get a curated list of popular and long-tail hashtags. Copy the whole pack or pick individually.
Emoji Finder & Picker
Searchable emoji picker with 300+ emojis across 9 categories. Click any emoji to copy. Recently used pinned up top.
Bio / Link-in-bio Builder
Build a clean bio with Unicode styling (bold, italic, script) and emoji dividers. Character counter for Instagram, Twitter, TikTok bios.
OG & Twitter Card Generator
Generate Open Graph and Twitter Card meta tags. Live preview for Facebook, Twitter, LinkedIn, Slack.
Email Signature Generator
Build a clean HTML email signature. Four templates, live preview. Works in Gmail, Outlook, Apple Mail.
UTM Link Builder
Build clean campaign URLs for Google Analytics. Source, medium, campaign, content, term — lowercase-normalized.
Mention & Hashtag Extractor
Paste any text — pull every @mention, #hashtag and URL. Deduplicated, sortable, copy-ready.
Multi-Platform Char Counter
Paste once, see limits for Twitter, Instagram, LinkedIn, TikTok, Threads, Bluesky, Mastodon, Pinterest, Facebook.
Username / Handle Checker
Validate your handle format across Twitter, Instagram, TikTok, GitHub, Reddit, YouTube, LinkedIn, Bluesky and more.