
Tools
238 tools, free, no sign-up
Free tools, no sign-up. Most run entirely in your browser.
238 tools
Text & type
Count, compare, convert and set writing.
Document ConverterConvert documents between Markdown, HTML, plain text, Word and EPUB, in your browser.
Text EditorA distraction-free Markdown writer with live preview, focus modes and full screen, saved in your browser as you type.
Font File ExplorerOpen a TTF, OTF or WOFF font to see its names, metrics, features and every glyph.
Glyph BrowserBrowse and search Unicode characters by block, and copy any glyph or its code.
Large TypeShow a word or a phone number as big as the screen allows, for reading across a room.
Line Height CalculatorWork out line height and leading from a font size and a ratio, with the CSS to copy.
Paper SizesDimensions of ISO A, B and C, US and other paper sizes in mm, inches, points and pixels.
PX to REMConvert pixels to rem and back against any root font size.
Text DiffCompare two texts and see which lines and words were added, removed or changed.
Typography CalculatorConvert between pixels, points, picas, agates, ciceros, inches, millimetres, centimetres, em and rem.
Word CounterCount words, characters, sentences and paragraphs, with reading time and the most used words.
Text ScratchpadA scratchpad for text, with tools to change case, sort, dedupe, trim, find and replace, and pull out emails or links.
Dev
Format, decode and test the formats code passes around.
Cron BuilderBuild a cron expression field by field, read it in plain words and see its next five runs in your time zone.
JSON FormatterFormat, minify or browse JSON as a tree, with the line and column of any syntax error.
Request BuilderCompose an HTTP request from a method, URL, query, headers and body, and copy it as a cURL command or raw HTTP.
Tailwind Cheat SheetSearch about 300 common Tailwind CSS classes by name or by the CSS they write, see each one applied live, and copy it.
UUID GeneratorMake up to 100 UUID v4, UUID v7 or Nano IDs at once, and see which bits hold the time, the version and the randomness.
HTTP Status CodesSearch every HTTP status code by number, name or meaning, with its defining RFC, whether it is cacheable and its registry state.
JWT DecoderDecode a JSON Web Token in your browser: read the header and payload, see when it was issued and expires, and check an HMAC signature with a secret.
Meta Tag GeneratorWrite the head tags for a page: title, description, canonical link, robots, Open Graph and X card tags, ready to paste, with character counts.
Regex TesterTest a JavaScript regular expression against your text: see every match highlighted, capture groups, named groups, and a replace preview.
Graphing CalculatorPlot functions of x, pan and zoom the plane, trace values step by step and save the graph as a PNG.
IPA TranscriberTurn English text into International Phonetic Alphabet symbols with stress marks, and fix any word by hand.
Calculators
Algebra, graphs, bases, units and time.
Algebra CalculatorSimplify, expand and factor expressions, solve equations, and take derivatives and integrals, with the answer typeset.
Base ConverterConvert whole numbers between decimal, hex, binary and octal up to 64 bits, flip bits by hand and try AND, OR, XOR, NOT and shifts.
EncoderEncode and decode Base64 and URL escapes, or hash text with MD5, SHA-1, SHA-256 and SHA-512, and see how each one maps.
Scientific CalculatorA full keypad with trigonometry in degrees or radians, powers, roots, logs, factorials, physical constants and a history of every sum.
Time CalculatorConvert Unix timestamps, add or subtract days, weeks and months, and read one moment across time zones.
Unit ConverterConvert length, weight, temperature, data, speed, volume, area, time and pressure, with every unit side by side.
Codes & secrets
QR codes, barcodes, passwords and old ciphers.
Barcode GeneratorMake Data Matrix, Aztec, PDF417, Micro QR, Code 128, Code 39, EAN-13 and UPC-A barcodes as PNG or SVG, one or a batch.
Cipher DecoderDecode Caesar, Vigenère, Atbash and other classical ciphers, or let it guess the cipher.
Password GeneratorGenerate strong random passwords or multi-word passphrases, made in your browser.
QR GeneratorMake styled QR codes for links, text, Wi-Fi and contacts, with your colours, dot shapes and logo, as PNG or SVG.
Colour
Convert, check, mix and pull colours from images.
Colour ConverterType a colour in any notation and read it in HEX, RGB, HSL, HSV, CMYK, LAB, LCH, OKLAB and OKLCH.
Colour AtlasOne colour opened up: every notation, its gamut, contrast, harmonies, tints and shades, and how it looks to colour-blind eyes.
Contrast CheckerCheck text and background colours against WCAG 2.2 and get the nearest colours that pass.
Colour-blind SimulatorSee a colour or an image the way nine kinds of colour vision deficiency would, side by side with the original.
Harmony GeneratorBuild complementary, triadic, analogous and nine other colour harmonies on a draggable wheel in OKLCH, LCH or HSL.
Palette GeneratorGenerate five-colour palettes by colour theory, mood, era, nature or art, lock the ones you like, and export CSS, SCSS, JSON or SVG.
Palette CollectionBrowse 285 hand-picked palettes in ten collections, from classic and vintage to keycaps and art movements, and export any of them.
Tailwind Shades GeneratorTurn one colour into a 50 to 950 shade ramp and copy it as a Tailwind v4 theme, CSS variables or a v3 config.
Gradient GeneratorDesign linear, radial, conic, four-corner and freeform gradients, blend them in OKLab, and copy the CSS or export a PNG up to 8192 px.
Palette ExtractorPull a three to eleven colour palette out of any image: the most common, vivid, muted, light, dark, warm, cool or rare accent colours.
Pixel PickerOpen an image, point at any pixel to read its colour in every notation, and keep the ones you want.
Images
Compress, convert, cut, trace and edit images in the browser.
Image AtlasOpen a photo to read its file facts, camera and exposure data, GPS location, colour profile and RGB histogram.
Background RemoverCut the subject out of a photo with an in-browser model, then save a transparent PNG or put it on a colour.
Artwork EnhancerAdd a fine layer of colour grain to digital art so flat fills look like paint or film, with a before and after view.
Favicon GennyTurn a logo into a full favicon set: PNG icons from 16 to 512 px, a favicon.ico, a ZIP and the HTML for your head.
Image ClipperCut the empty transparent border off a PNG or WebP so the image is trimmed to its visible pixels.
Image CompressorShrink a JPEG, WebP, PNG or AVIF in your browser and see the size saved before you download.
Image ConverterConvert images between PNG, JPEG, WebP, AVIF, GIF, BMP, TIFF, ICO and ICNS, with resize and a ZIP for batches.
Image DeskewerStraighten a photo of a page, whiteboard, sign or screen taken at an angle by dragging its four corners.
Image MaskerCut a picture into a shape such as a squircle, star or blob, or into your own SVG, and save it as a transparent PNG.
Image SplitterCut an image into a grid of equal tiles for carousels or sprite sheets, and download them as a ZIP.
Image StitcherJoin two or more images into one picture, in a free layout or an even grid, and save it as PNG, JPEG or WebP.
Image TracerTurn a raster image into a scalable SVG with colour quantising, 16 presets and fine control over smoothing.
Metadata StripperSee the GPS, camera, author and other hidden metadata in a JPEG, PNG, WebP, GIF or PDF, then download a clean copy.
Placeholder GennyMake a placeholder image of any size with your colours and label, as PNG or SVG, or copy it as a data URI.
SVG OptimiserShrink SVG code with SVGO as you paste it, preview the result and see how many bytes were saved.
Base64 Image EncoderTurn images into Base64 data URIs to paste into HTML, CSS or JSON, one or many at a time.
Paste ImagePaste a screenshot from the clipboard, crop it, and save it as a file or copy it back.
SubstrataArrange, crop, adjust and mark up images on one canvas, then export PNG, JPEG or WebP. All in your browser.
WorkflowsRun a batch of images through resize, crop, convert, compress, watermark, strip and rename steps, then download a zip.
Audio & video
Trim, convert, record and subtitle media without uploading it.
Timecode CalculatorAdd and subtract SMPTE timecodes at any broadcast frame rate, drop-frame included, with the frame count and real time.
Subtitle ConverterConvert SRT and WebVTT both ways, shift every cue, and retime between frame rates.
Waveform GeneratorTurn a song or voice clip into a waveform picture, as PNG or SVG, in your colours and size.
Audio NormaliserMeasure a file's loudness in LUFS and bring it to a streaming, podcast or broadcast target, without clipping.
Audio TrimmerCut a stretch of audio on its waveform, add fade in and out, and save it as WAV.
Video MuterStrip the sound from a video without re-encoding it, as MP4, MOV, WebM or MKV.
Audio ExtractorPull the soundtrack out of a video as WAV, M4A, Ogg or FLAC, in your browser.
Video TrimmerCut a clip out of a video by in and out points, losslessly at keyframes or frame-exact.
Video to GIFTurn a few seconds of video into a looping GIF, choosing the range, frame rate and width.
Frame ExtractorGrab full-size PNG stills from a video, frame by frame, or make a contact sheet of the whole thing.
Audio AtlasOpen an audio or video file and see its container details, waveform, average spectrum, peak, RMS and integrated loudness in LUFS.
Video AtlasOpen a video to read its container, codec, frame size and rate, and download a contact sheet of evenly spaced frames stamped with time.
Auto SubtitleTurn speech in a video or audio file into timed subtitles with Whisper running on your own device, then edit them and save SRT or VTT.
Screen RecorderRecord a screen, window or browser tab with optional tab sound and microphone, preview the take and download it as a video file.
Subtitle StudioWrite or load SRT and VTT subtitles, preview them on your video with your own font and position, and burn them into a new video.
Voice RecorderRecord from your microphone with a live level meter, pause and resume, play the take back and download it as WebM, Ogg, M4A or WAV.
PDF & print
Merge, split, edit and impose PDFs for print.
PDF OrganiserMerge PDFs, split them into parts, and reorder, rotate, copy or delete pages from thumbnails.
PDF PreflightCheck a PDF for print: page boxes and bleed, fonts, colour spaces, image resolution and transparency, with findings per page.
Image to PDFTurn JPG, PNG and WebP images into one PDF, with paper size, orientation, margins, fit and optional 3 mm print bleed.
PDF to ImagesRender PDF pages to PNG, JPEG or WebP at the resolution you choose, all pages or a range, downloaded singly or as a ZIP.
PDF Rotate and CropTurn pages in quarter turns and trim margins in millimetres, on all pages or just the ones you pick, with a live preview.
PDF Page NumbererAdd page numbers in arabic, roman or letter style, with a text template, and an optional DRAFT stamp or watermark, on any PDF.
PDF CompressorShrink a PDF in your browser by repacking it and re-encoding photos as lighter JPEGs, with the before and after size shown.
PDF ImposerRearrange a PDF's pages onto printer sheets for booklets, perfect-bound books, step-and-repeat runs and N-up grids, with crop marks.
Zine ImposerDrop in page images and get a print-ready sheet for a one-cut mini zine or an accordion zine, with optional bleed and fold marks.
Errata PDF EditorFix a PDF in the browser: type text, white out mistakes, highlight, add a picture or draw a signature, then download the edited file.
Marketing
Campaign arithmetic: rates, costs, returns and links.
CTR CalculatorWork out click-through rate from impressions and clicks, and compare it with the usual rate for the channel.
Marketing ROI CalculatorTurn ad spend, revenue and cost of goods into profit, ROI, ROAS, margin and break-even revenue.
Bounce Rate CalculatorFind the share of sessions that bounced from your session and bounce counts, with the share that stayed.
A/B Test Sample Size CalculatorEstimate how many visitors each variant needs to detect a lift in conversion rate, and how many days that takes.
Traffic Value CalculatorEstimate what a month of website traffic is worth in orders, revenue and profit, and what each visitor brings.
Page Speed Revenue CalculatorEstimate the extra orders and revenue a faster page could bring, using a conversion lift you choose per second saved.
Cost Per Acquisition CalculatorDivide campaign spend by acquisitions to get CPA, and see the profit per customer if you know what each is worth.
Retention Rate CalculatorWork out the share of customers you kept over a period from the start count, end count and new customers added.
Conversion Rate CalculatorDivide conversions by visitors, see how many visitors each conversion takes, and how many you need to hit a target rate.
CPM CalculatorCalculate cost per thousand impressions, or solve for the total cost or the impressions when you know the other two.
Customer Lifetime Value CalculatorEstimate what a customer is worth in profit over their lifetime from order value, purchases a year, years kept and margin.
Cost Per Lead CalculatorDivide spend by leads to get CPL, and the cost of each customer when you know how many leads close.
Cost Per View CalculatorDivide video ad spend by views to get the cost per view, and the cost of a thousand views.
NPS CalculatorCompute Net Promoter Score from promoter, passive and detractor counts, or by pasting the raw 0 to 10 survey scores.
Engagement Rate CalculatorAdd up likes, comments, shares and other interactions and divide by followers, reach or impressions.
ROAS CalculatorDivide ad revenue by ad spend for return on ad spend, and see the break-even ROAS and profit for your margin.
CAC Payback Period CalculatorFind how many months a customer takes to repay their acquisition cost, from monthly revenue, margin and running costs.
CAC CalculatorAdd up every cost of winning customers and divide by customers won, with each cost line's share of the total.
Churn Rate CalculatorWork out churn from customers at the start and customers lost, with the monthly and yearly equivalents and expected lifetime.
MRR and ARR CalculatorRoll a starting MRR forward with new, expansion and churned revenue to get ending MRR, ARR, growth and net revenue retention.
UTM Link BuilderAdd UTM source, medium, campaign and optional tags to a URL, with options to lowercase values and tidy spaces.
Funnel VisualizerEnter the number of people at each step of a funnel to see conversion from the top, step to step, and where most are lost.
Tracking Pixel GeneratorBuild the HTML for a 1x1 tracking pixel from your endpoint, with query parameters, a cache buster and a referrer policy.
Colour Picker and Contrast CheckerPick a colour and read it as HEX, RGB and HSL, then check its contrast against another colour for WCAG text and UI rules.
Open Graph Tag GeneratorFill in a page’s title, description and image to get the Open Graph and X card meta tags, with a link-card preview.
Privacy Policy BuilderAnswer a short questionnaire about your site and get a plain-language privacy policy draft in English or Vietnamese.
LinkedIn Font GeneratorTurn text into bold, italic, script and other Unicode styles you can paste into posts, comments, your headline and About section.
Discord Font GeneratorTurn text into bold, italic, script and other Unicode styles you can paste into messages, nicknames, display names, server and channel names.
X Font GeneratorTurn text into bold, italic, script and other Unicode styles you can paste into posts, replies, your display name and bio.
Reddit Font GeneratorTurn text into bold, italic, script and other Unicode styles you can paste into post titles, post bodies, comments and your profile about.
Facebook Font GeneratorTurn text into bold, italic, script and other Unicode styles you can paste into posts, comments, Page posts and your profile intro.
Instagram Font GeneratorTurn text into bold, italic, script and other Unicode styles you can paste into your bio, the Name field, captions and comments.
Threads Font GeneratorTurn text into bold, italic, script and other Unicode styles you can paste into posts, replies and your bio.
YouTube Font GeneratorTurn text into bold, italic, script and other Unicode styles you can paste into video titles, descriptions, comments and community posts.
TikTok Font GeneratorTurn text into bold, italic, script and other Unicode styles you can paste into captions, comments, your name and bio.
Pinterest Font GeneratorTurn text into bold, italic, script and other Unicode styles you can paste into Pin titles, Pin descriptions and board names.
VK Font GeneratorTurn text into bold, italic, script and other Unicode styles you can paste into posts, comments, your status and community names.
Bluesky Font GeneratorTurn text into bold, italic, script and other Unicode styles you can paste into posts, replies, your display name and bio.
Slack Font GeneratorTurn text into bold, italic, script and other Unicode styles you can paste into messages, your status and your display name.
Telegram Font GeneratorTurn text into bold, italic, script and other Unicode styles you can paste into messages, channel posts, your name and bio.
X Character CounterCount characters as X does and see how close you are to each limit, from the post or reply (280) down.
Threads Character CounterCount characters as Threads does and see how close you are to each limit, from the post or reply (500) down.
Instagram Character CounterCount characters as Instagram does and see how close you are to each limit, from the caption (2,200) down.
Facebook Character CounterCount characters as Facebook does and see how close you are to each limit, from the post (63,206) down.
LinkedIn Character CounterCount characters as LinkedIn does and see how close you are to each limit, from the post (3,000) down.
TikTok Character CounterCount characters as TikTok does and see how close you are to each limit, from the caption (4,000) down.
YouTube Character CounterCount characters as YouTube does and see how close you are to each limit, from the video title (100) down.
Pinterest Character CounterCount characters as Pinterest does and see how close you are to each limit, from the pin title (100) down.
Reddit Character CounterCount characters as Reddit does and see how close you are to each limit, from the post title (300) down.
Bluesky Character CounterCount characters as Bluesky does and see how close you are to each limit, from the post or reply (300) down.
SEO & site checks
Titles, descriptions, tags and what a page loads.
Cookie & Tracker ScannerSee the cookies a page sets in its HTTP response and the analytics, ad and session-recording scripts in its HTML.
Core Web Vitals CheckerCheck a page's LCP, INP and CLS from real Chrome visits, plus a Lighthouse lab run, on mobile or desktop.
Analytics DetectorFind which analytics tools, tag managers and ad pixels a website loads, with their IDs and how much each one tracks.
SEO Title GeneratorFive AI-written title tags for a page, built around your keywords and sized for search results.
Meta Description GeneratorFour AI-written meta descriptions that sum up a page and give searchers a reason to click.
Curiosities
Morse, Braille, IPA, Shavian and other alphabets, plus odd units.
Shavian TransliteratorWrite English in the Shavian alphabet by sound, from a pronouncing dictionary, then fix any word letter by letter.
Morse Code TranslatorTurn text into Morse and back, key it in with dots and dashes, and hear it played at the speed you choose.
Braille ConverterTurn text into Unified English Braille cells and back, see each cell embossed, and count the pages it fills.
NATO Phonetic AlphabetSpell text out as Alfa, Bravo, Charlie (or the German DIN 5009 words), read spellings back, and see each letter's signal flag.
Stupid UnitsMeasure anything in bananas, Eiffel Towers, blue whales, Big Macs or Warhols, across ten kinds of quantity.
Recipe TableWrite a recipe in plain text and get a Cooking for Engineers table: scale it, switch units, print it or copy it.

Social images
Crop, matte and size images for each platform.