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3D Photo Bring a photo to life with a 3D camera move: an AI model reads its depth, then save it as a video, without uploading it AES Encryption Encrypt and decrypt text with a password (AES-256-GCM), in your browser AI Image Check See whether an image says it was made or edited by AI: its Content Credentials (C2PA), checked, its IPTC metadata and the traces of AI generators, without uploading it API Tester Send HTTP requests and inspect the response Archive Extractor Open a ZIP, RAR, 7z, TAR or GZ archive, see what it holds and extract one file or all of them, from password-protected ZIPs too, without uploading it ASCII Art Turn a text into a big ASCII art banner, in over 60 FIGlet fonts, to paste in a README, a code comment or a terminal ASCII Tree Turn an indented list into an ASCII folder tree Aspect Ratio Resize dimensions while keeping the aspect ratio Audio Converter Convert a song, a recording or the sound of a video to MP3, M4A, Opus or WAV, cut it and fade it in or out, without uploading it Audio Spectrum See the frequencies of a sound, from your microphone or an audio file: live spectrum, spectrogram, loudest frequency and note Background Remover Remove the background of an image with an AI model or by color, touch it up with a brush, without uploading it Barcode Generator Make an EAN, UPC, ISBN, Code 128, ITF-14, Data Matrix, PDF417 or Aztec barcode, its check digit computed, as SVG or PNG Base64 Encode and decode Base64 text BMI Calculator Your body mass index from your height and weight, in metric or imperial units, its WHO category and the healthy weight range for your height Box Shadow Generator Layer box shadows with a live preview, or paste one to edit it, and copy its CSS Brick Mosaic Turn a photo into a mosaic of building bricks, in the colors still made, with the pieces to order and a plate-by-plate PDF, without uploading it Calculator Compute an expression as you type it: percents, powers, roots, trigonometry, with a history Calendar Event Make an event file (.ics) and Add to Google Calendar or Outlook links, with its time zone and reminder CanvAscii Draw freehand and get ASCII art Case Converter Convert text to UPPERCASE, Title Case, camelCase, snake_case and more, and clean up, sort or shuffle its lines Certificate Decoder Read an X.509 certificate, a chain or a CSR: names, issuer, expiry, key, extensions and fingerprints Chart Maker Turn a table pasted from a spreadsheet or a CSV into a bar, line, area, pie or scatter chart, and download it as SVG or PNG, without uploading it Chmod Calculator Convert Unix file permissions between octal, symbolic and checkboxes Classic Ciphers Encode and decode Caesar, ROT13, Vigenère, Atbash, affine, rail fence, A1Z26 and Morse code, and crack a Caesar or Vigenère message Clipboard Inspector Paste to see every format a copy holds: its plain text with the invisible characters shown, the HTML with its hidden styles and text, the tracking in its links, its images Code Editor Edit code in tabs with syntax highlighting, search and completion, in files of your device or of a workspace kept in your browser Code Screenshot Turn code into an image to post: highlighted in its language, in a window on a gradient, as a sharp PNG Color Converter Convert a color between HEX, RGB, HSL and OKLCH and check its contrast Command Checker Paste a shell command found online before running it: what each part does, and what's risky in it (a script piped to bash, hidden characters, a disk wiped) Cron Expression Explain a crontab schedule and list its next runs Cross-Stitch Pattern Turn a photo or a drawing into a cross-stitch pattern in DMC threads, with its symbols, the skeins to buy and a printable PDF, without uploading it CSP Evaluator Spot the weak sources and mistakes of a Content-Security-Policy, and test URLs against it CSS clamp() Generator Make a font size or spacing scale with the screen width, between a min and a max CSS Gradient Generator Build a linear, radial or conic gradient from color stops and copy its CSS CSS Unit Converter Convert px, rem, em, %, vw, vh, pt and the other CSS lengths, for your root font size and viewport CSV to SQL Turn CSV data into INSERT statements, with an optional CREATE TABLE CSV Viewer Open a CSV too big for a spreadsheet, sort and filter its rows, see what each column holds and save the rows you kept, without uploading it curl Converter Turn a curl command into fetch, Python, PHP or Go code, and a fetch call back into curl Data over Sound Send a text or a small file to a nearby phone or computer as a sound, audible or near ultrasound: a speaker, a microphone, no network Data URL Convert a file or image into a data URL Date Difference Days, weeks and business days between two dates, or a date plus or minus a duration DNS Lookup Query the DNS records of a domain Docker Compose Converter Turn docker run commands into a compose.yaml, and a Compose file back into docker run commands Document Scanner Scan paper with your camera or from photos: each page found, straightened and cleaned of its shadows, all saved as one PDF, without uploading them Domain Availability Check whether a domain name is free to register Download Time Calculator How long a file takes to download at a given speed, or the speed it needs to come down in a given time, bits and bytes sorted out Dummy File Generator Create test files of an exact size, valid or corrupted: images, PDF, text, raw or custom bytes E-Invoice Viewer Read a Factur-X, ZUGFeRD or XRechnung invoice, PDF or XML: its parties, lines, VAT and totals, checked, without uploading it Electronics Calculator Read a resistor's color bands or SMD code and a capacitor's code, apply Ohm's law, size an LED's resistor or a voltage divider, add parts in series or parallel Email Header Analyzer Trace the servers a mail went through, with the delays, and read its SPF, DKIM and DMARC results Email Security Check a domain's SPF, DKIM and DMARC records Enc-It Base64, MD5, SHA-1, SHA-256 and SHA-512 of a string EXIF Editor Edit the description, camera, dates and GPS location of a JPEG, PNG or WebP image without re-encoding it EXIF Remover Remove EXIF, GPS, XMP and other metadata from JPEG, PNG, WebP, GIF, HEIC and AVIF images without re-encoding them Expense Splitter Split the costs of a trip or a shared flat: who paid what and for whom, each one's balance, and the fewest transfers to settle up Fake Data Generator Generate mock data for tests: names, emails, addresses, dates, IDs and more, as JSON, CSV or SQL inserts Favicon Generator Make a favicon.ico, the Apple touch icon and the web app manifest from an image or a few letters, without uploading it File Checksum Hash a file with MD5, SHA-1 or SHA-2 and check it against the published checksum File Metadata Inspect file properties and image EXIF data Font Inspector See what a font holds, its glyphs, OpenType features, variable axes, metrics and license, then subset it and convert it to WOFF2 for the web, without uploading it Format Converter Convert data between JSON, YAML and CSV Fuel Cost Calculator What a trip costs in fuel or electricity, from the distance, the consumption and the price, in L/100 km, mpg or kWh, and each one's share Gamepad Tester Test a game controller: every button and trigger, the sticks with their drift and circularity, and the vibration Glitch Art Break an image on purpose: a corrupted JPEG, shifted slices, sorted pixels, split colors and scan lines, saved as a PNG, without uploading it Grade Calculator The weighted average of your grades, out of 20, 10 or 100, and the grade you need on the next exam to reach the average you want Graphing Calculator Plot functions, equations and inequalities, polar and parametric curves, with sliders, and read their roots, extremes and crossings Handwriting Font Print a template, fill it in by hand, scan or photograph it, and get a font of your own handwriting to install, without uploading it Hex Editor View and edit the bytes of a file in hex or as text, without uploading it HMAC Generator Sign a message with a secret key and check a webhook signature htpasswd Generator Create the user:hash lines of an Apache or Nginx basic auth file HTTP Status Codes Look up what each HTTP status code means and when it is sent Hum to Sheet Music Hum, sing or whistle a tune and get its notes as sheet music, MIDI, MusicXML or ABC, from your microphone or an audio file, without uploading it IBAN Checker Check an IBAN before a transfer: its length and check digits for its country, the French RIB key and other national checks, the typos that would make it valid, and its BIC ID Watermark Write who a copy of your ID card, passport or payslip is for across it, so it can't be reused elsewhere, without uploading it Image Compare Compare two images with a slider, an overlay or a blink, and see the pixels that differ, counted and framed, without uploading them Image Cropper Crop, rotate and flip an image, freely or to a ratio (1:1, 16:9…), without uploading it Image Dither Turn an image into 1-bit or retro pixel art, dithered with Floyd–Steinberg, Atkinson or Bayer in the Game Boy, CGA, C64 or PICO-8 colors, without uploading it Image Optimizer Compress, resize and convert an image, HEIC photos included, and strip its metadata, without uploading it Image Prompt Builder Write a prompt for Midjourney, Flux, Stable Diffusion or GPT Image, explain the parameters of one, and convert it from one model's syntax to another's Image Redactor Black out the faces, emails, IP addresses, keys or any area of an image, found for you or drawn, without uploading it Image to ASCII Turn an image into ASCII art, in characters or Braille dots, in color or not, to copy as text or save as PNG, HTML or for a terminal, without uploading it Image to SVG Turn a logo, an icon or a drawing into a vector SVG, in color or black and white, to enlarge it without blur, without uploading it Image Upscaler Enlarge a photo or a drawing 2 or 4 times with an AI model that sharpens it, without uploading it Inflation Calculator What a sum from a past year is worth today, from official price indices: France since 1901 in francs or euros, the US since 1913, the UK since 1800, the rest of Europe since 1996 Invisible Text Hide a secret message in an ordinary text with invisible characters, and reveal what a pasted text hides Is It Up? Check whether a website is up or down for everyone, and how fast it answers Jigsaw Puzzle Cut a photo into a jigsaw puzzle of 24 to 500 pieces and solve it against the clock, without uploading it JSON Formatter Format, minify and validate JSON JSON to Types Generate TypeScript, Go, Python or PHP types from a JSON sample JWT Decoder Decode a JSON Web Token, inspect its claims and verify its signature Keyboard Events Press a key to see its key, code, keyCode, location and modifiers Knitting Chart Turn a photo into a colorwork chart for knitting, stitch by stitch, sized to your gauge, stranded or intarsia, with its floats or balls checked and a printable PDF, without uploading it Lithophane Maker Turn a photo into a lithophane to 3D print, flat, curved or a lamp cylinder, seen lit from behind in 3D before saving its STL, without uploading it Loan Calculator The monthly payment, total cost and APR of a mortgage or any loan, with insurance and fees, how much you can borrow on your income, an early repayment and the full schedule Lorem Ipsum Generate placeholder text as paragraphs, sentences or words, plain or HTML MAC Address Lookup Find who made a device from its MAC address, or see that it's a phone's private random one, for one address or the whole list of your router or arp -a Margin Calculator The margin, markup and profit from a cost and a selling price, or the price that gives the margin or markup you want Markdown Preview Render Markdown live and copy the resulting HTML Markdown Table Edit a grid or paste CSV and get an aligned Markdown table Meme Generator Put a caption on a photo, in white Impact-style letters or in a band above it, and move the texts where you want, without uploading it Metronome Keep time from 20 to 300 BPM: time signature, accents, subdivisions, tap tempo, and a trainer that speeds up or drops bars Mind Map Build a mind map with the keyboard or from an indented list, and export it as SVG, PNG or Markdown Minifier Minify JavaScript, HTML and CSS Music Visualizer Watch your music move like in Winamp or Windows Media Player: spectrum bars, oscilloscope, MilkDrop-style tunnels and kaleidoscopes, in full screen, from your files, your microphone or another tab Note Write a note in a simple text editor, saved in your browser Number Base Converter Convert a number between decimal, hex, binary, octal or any base, and edit its bits Number to Words Write a number or an amount in words, in English or French, as on a check, and as an ordinal Object Remover Paint over a person, an object or a text in a photo to make it disappear, the background filled in by an AI model, without uploading it OCR Read the text of an image or a scanned PDF, on your device Pace Calculator Find a run's pace, time or distance from the other two, with the splits and your likely times over 5K, 10K, a half and a full marathon Palette Extract the dominant colors of an image Password Generator Generate passwords, passphrases, UUIDs and random tokens Password Hash Hash a password with Argon2 or bcrypt, or check a password against a hash PDF Compressor Make a PDF smaller by recompressing its images and slimming its fonts, without uploading it PDF Filler Fill in a PDF form, or type text, ticks, crosses and dates anywhere on a PDF, then download it, without uploading it PDF Inspector See what a PDF holds before you open it: scripts, automatic actions, links, attachments, signatures and properties PDF Password Protect a PDF with a password or restrict its printing and copying, or remove the password of one you can open, without uploading it PDF Signer Sign a PDF with a signature you draw, type or take from an image, and add the date or your name, without uploading it PDF to Image Turn the pages of a PDF into JPG, PNG or WebP images, at the resolution you choose, without uploading it PDF to Word Turn a PDF into a Word document you can edit (DOCX), its headings, lists, tables and pictures kept, without uploading it PDF Toolkit Merge, split, reorder, rotate and delete PDF pages, and turn images into a PDF, without uploading them Percentage Calculator A percent of a number, what percent one number is of another, the change from one to the other, and a number before or after a rise or a discount Phonetic Alphabet Spell a name, a reference or a password with the NATO alphabet (Alfa, Bravo…) or another, and hear it Photo Booth Play with your webcam: Time Warp scan, slit-scan, trails, fisheye, thermal, ASCII and more, then take a photo, a strip of four or a clip, nothing uploaded Photo Editor Adjust a photo's light and colors: exposure, contrast, highlights and shadows, white balance, saturation, clarity, vignette and grain, or pick a ready-made look, without uploading it Pixel Art Editor Draw pixel art and sprites with a pencil, fill, lines and shapes, in the PICO-8 or Game Boy colors, animate them frame by frame and save a PNG, a sprite sheet or a GIF Placeholder Image Make a placeholder image of any size, with its colors and label, as PNG, JPEG, WebP, SVG or a data URL Pointer Events Touch, click or draw to see each pointer, its pressure, size and tilt, and the gesture it makes Post-Quantum Check See whether a site, a certificate or an SSH, PGP or JWK key would resist a quantum computer, when NIST retires its algorithms and what replaces them Proportion Calculator The rule of three: three values of a proportion, direct or inverse, give the fourth, or check whether four are in proportion QR & Barcode Scanner Read the QR codes and barcodes of an image or of your camera, and see where a link leads before you open it QR Code Generate a QR code from any text or URL QR File Transfer Send a file from one device to another through a stream of QR codes: one screen, one camera, no network, no cable Random Draw Draw winners, shuffle a list, split it into teams or pick random numbers Recipe Scaler Scale a recipe to more or fewer servings or another pan, and turn its cups and spoons into grams, ingredient by ingredient Redirect Checker See every redirect a link goes through and where it finally leads: shortened links, trackers added on the way, loops, broken ends Regex Tester Test a regular expression and inspect its matches and groups Reverse DNS Find the hostname behind an IP address robots.txt Tester Check which URLs a robots.txt lets each crawler visit, and spot its mistakes Roman Numerals Convert numbers and dates to Roman numerals and back, with how each one is built Savings Calculator What your savings grow to with compound interest and monthly deposits, after tax and inflation, or what to put aside each month for a goal Screen Recorder Record your screen, a window or a tab, with your microphone, the sound it plays and your camera in a bubble, then download the video: no watermark, no time limit, nothing uploaded Screen Ruler A ruler at actual size on your screen, calibrated with a bank card: measure an object in cm or inches, find a ring size, see a coin or a sheet at 1:1 Screen Test Find dead or stuck pixels, backlight bleed and color banding in full screen, measure the refresh rate and see the motion blur of your display Screenshot Beautifier Put a screenshot on a gradient background, in a window or browser frame, with rounded corners and a shadow, ready to post, without uploading it Secret Santa Draw a Secret Santa that keeps couples and exclusions apart, then pass the device around: each person sees only their own pick Secret Split Split a recovery phrase or a password into shares to give out: any 3 of 5 rebuild it, fewer tell nothing (Shamir's secret sharing) Semver Checker Check which versions satisfy a range (^1.2.3, ~2.0, >=1 <3…), see what it means, then compare and sort versions as npm does Site Security Check a site's TLS certificate and security headers Sleep Calculator When to go to bed to wake up at a given time, or when to wake up if you go to bed now, in whole sleep cycles Sliding Puzzle Play the 15 puzzle with numbers or your own photo, from 3 × 3 to 6 × 6, against the clock and the move count, without uploading it Sound Level Meter Measure noise in decibels with your microphone: A, C or Z weighting, Leq, max and peak, your daily noise dose, and a night log of each loud sound with its recording Spectrogram Painter Turn an image or a text into a sound whose spectrogram draws it, like the face Aphex Twin hid in Windowlicker, as a WAV, without uploading it Speech to Text Transcribe an audio or video file into text or subtitles (SRT, VTT) with Whisper, on your device: a meeting, an interview, a voice message, in 99 languages Speed Test Measure your download and upload speed, latency and jitter SQL Formatter Format SQL queries, in the dialect of PostgreSQL, MySQL, SQL Server, Oracle, SQLite… SSTV Decode the slow-scan TV pictures a radio receives, the space station's included, live or from a recording, and turn a picture into SSTV sound to transmit Star Map The night sky of a date and a place, as it was: stars, constellations, the Moon and the planets, as a poster to print Steganography Hide a text or a file in the pixels of an image, encrypted with a password if you like, and read what one hides, without uploading it String Escaper Escape and unescape a string for JSON, JavaScript, SQL, shell, regex, CSV, HTML or URL Subnet Calculator Network, netmask and host range of an IPv4 or IPv6 subnet SVG Optimizer Clean and minify an SVG with SVGO, preview it before and after, get it as a file, a data URL or CSS Task Frequency How long a goal takes at a given pace, or the pace it needs Text Diff Compare two texts and highlight what changed Text Stats Count characters, words, sentences and more Text to Speech Read a text aloud with your browser's voices, at the speed and pitch you choose Time Lock Lock a message so it can only be read after hours or days of computing, with no server and no one to trust (a time-lock puzzle) Time Zone Converter Convert a time between time zones and cities, and line up the hours of the day to plan a meeting Timer Count down, time laps with a stopwatch or work in Pomodoro rounds, in full screen, with a sound and a notification when the time is up Timestamp Converter Convert Unix timestamps to dates and back Tip Calculator The tip on a bill and the total, split between several people, each share rounded up if you like To-Do List Keep a quick to-do list, saved in your browser Tone Generator Play a tone at any frequency, sweep from low to high to test your hearing or speakers, or white, pink and brown noise TOTP Generator Get the current two-factor code of a secret, or make a new secret and its QR code for an authenticator app Tuner Tune a guitar, bass, ukulele, violin or any instrument with your microphone: the note you play, how many cents off, and the string to tune Typing Fingerprint Learn how each person types a phrase, the time each key is held and the time between keys, then tell who is typing from the rhythm alone Typing Test Measure your typing speed in words per minute and your accuracy, in English, French, German or Spanish, and see on your keyboard the keys that slow you down Unicode Inspector Reveal invisible characters, look-alike letters and encoding issues in a text Unit Converter Convert lengths, weights, temperatures, volumes, data sizes and more, into every unit at once URL Parser Break down a URL, edit its query parameters, encode and decode URL to Markdown Turn a web page's main content into clean Markdown, without menus, ads or footer UUID Decoder Read the version and creation date of a UUID or ULID, convert it to other formats, and make name-based UUIDs VAT Calculator Add or remove VAT from a price, at your country's rates or any other Video Compressor Make a video smaller, to a quality or a file size, trim it, lower its resolution or remove its sound, without uploading it Video to GIF Turn a video or a screen recording into an animated GIF or WebP: trim it, choose its size and frame rate, without uploading it Vocal Remover Split a song into its vocals and its music, or into vocals, drums, bass and the rest, with an AI model, without uploading it: karaoke, a cappella, practice Voice Recorder Record your voice or any sound from your microphone, pause and resume, play it back and download it as M4A, WebM or WAV Webcam & Mic Test Test your webcam, microphone and speakers: live preview with the real resolution and frame rate, sound level, a recording to play back, left and right channels What The Hash Identify a hash type among 200+ formats What's My IP Your public IP address and what your browser tells every site WHOIS Lookup Who registered a domain, an IP address or an AS number, through which registrar, and when it expires Word Cloud Turn a text into a cloud of its most frequent words, the common ones left out, and download it as SVG or PNG, without uploading it Word to PDF Convert Word documents to PDF, and Excel and PowerPoint files too (DOCX, DOC, XLSX, PPTX, ODT…), with LibreOffice running in your browser, without uploading them XML Formatter Format, minify and validate XML, and query it with XPath XSS Helper Encode a string for URL, HTML, JavaScript and CSS contexts

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License Generator

Pick an open source license and get its LICENSE file and source file header

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Permissive

Anyone may reuse your code, even in closed software, as long as they keep your copyright notice.

MIT Short and simple, the most used. Apache 2.0 Adds a patent grant. Changes must be stated. BSD 3-Clause Also bars using your name to promote their version. BSD 2-Clause The MIT terms, in other words. ISC The MIT terms, in fewer words.

Copyleft

Anyone may reuse your code, but must share the source of their changes, under the same license.

MPL 2.0 Only the files they change stay open. LGPL 3.0 The library stays open, not the apps using it. GPL 3.0 The whole program they distribute stays open. AGPL 3.0 Like the GPL, even when it only runs on a server.

Public domain

Anyone may do anything with your code, without even crediting you.

Unlicense Written for software. CC0 1.0 For any work: code, data, documents.

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