66 Free Online Developer, Design & Media Tools
66 developer, design, math, and media tools that run in your browser. Your files stay on your device.
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AI & Canvas Studio
Sketch canvas with shape suggestions and SVG export
- Sketch Studio — Sketch rough doodles and swap them for clean clipart, then add shapes, text and images and export your canvas as PNG, JPEG, SVG or JSON.
Security & Crypto
Passwords, MD5/SHA hashes, HMAC, Base64 and JWT decoding
- JWT Decoder & Inspector — Paste a JSON Web Token to decode its header and payload into readable JSON and see right away whether the exp claim has expired.
- Random Password Generator — Create random passwords from 4 to 64 characters, choose letters, numbers and symbols, see an entropy estimate, and generate up to 10 at once.
- Hash, HMAC and Text Encoding Generator — Type text once and get MD5, SHA-1, SHA-256, SHA-512 and HMAC-SHA256 digests plus Base64, URL-encoded and HTML-escaped versions, updated live.
- Text Encoder and SHA Hash Inspector — Convert text to Base64, hex, URL encoding and HTML numeric entities, or switch tabs to view SHA-256 and SHA-512 hashes, all in your browser.
Image & Favicons
Filters, resize, format conversion, favicons, sprites and QR codes
- Image Filters and Adjustments — Adjust brightness, contrast, saturation and hue, or apply blur, pixelate, grayscale, invert and vignette to a photo with a live preview.
- Resize, Rotate and Flip Image — Resize an image to exact pixel dimensions with an optional aspect-ratio lock, rotate it in 90-degree steps, or flip it horizontally or vertically.
- SVG to PNG, JPEG and WebP Converter — Open an SVG or other image, preview it, and save it as PNG, JPEG or WebP with an adjustable quality setting, all inside your browser.
- Favicon and App Icon Generator — Turn one image into a ZIP of PNG favicons and app icons from 16x16 to 512x512, plus a site.webmanifest file for your website.
- CSS Sprite Sheet Generator — Drop several icons and get ready-to-use CSS classes with the width, height and background-position of each image in a vertical sprite layout.
- Add Text Watermark to Image — Stamp a text watermark on a photo with your own wording, font size, color, opacity and corner or center position, then download the result.
- Extract Color Palette from Image — Upload a picture to see its eight most common colors as hex codes, and click any swatch to copy the value to your clipboard.
- Batch Image Converter (WebP, AVIF, JPEG, PNG) — Convert many images at once to WebP, AVIF, JPEG or PNG with a quality slider, compare file sizes, and download them singly or as a ZIP.
- SVG Minifier — Paste SVG markup to strip comments and the XML declaration and collapse whitespace, then see the byte savings and copy the smaller code.
- QR Code Generator — Create QR codes for links, Wi-Fi, vCard contacts, email, SMS, chat links or text. Add a center logo and download PNG or SVG.
- Image to Base64 Converter (Data URI) — Convert any image to a Base64 string or data URI for HTML, CSS or JSON, with ready-made img and background-image snippets. Runs in your browser.
- Base64 to Image Converter (Decode & View) — Paste a Base64 string or data URI, preview the decoded image and download it with the correct file type. Works for PNG, JPEG, GIF, WebP and more.
PDF Suite
Merge, rotate, watermark, sign and edit PDF metadata
- Merge PDF Files — Combine two or more PDF files into one document in your browser. Pages keep their original order, and nothing is uploaded to a server.
- Images to PDF Converter — Turn JPEG and PNG images into a single PDF with one image per page. The conversion runs locally in your browser with no upload.
- Rotate PDF Pages — Rotate every page of a PDF by 90, 180, or 270 degrees and download the fixed file. Works in your browser without uploading the document.
- Add Text Watermark to PDF — Stamp a diagonal text watermark such as DRAFT or CONFIDENTIAL across every page of a PDF. Processing stays in your browser.
- Draw and Add a Signature to PDF — Draw your signature with the mouse and place it on the last page of a PDF. Simple local signing that never uploads your document.
- PDF Metadata Editor — Set the title, author, subject, and keywords stored inside a PDF file. Edit document properties in your browser with no upload.
Screen recorder, audio cutter, volume and speed
- Screen and Tab Recorder — Record your screen, an app window, or a browser tab with optional microphone narration, then save it as a WebM video. No install needed.
- Audio Cutter, Volume Booster & Speed — Trim an audio clip, raise or lower its volume, and change playback speed, then export the result as WAV. Runs locally in your browser.
- Local Video Player — Open and play an MP4, WebM, or MOV file in your browser without uploading it. A quick way to check a video file on any computer.
Developer & Code
Formatters, diff checker, regex tester, playground and generators
- Shareable Data Link Generator — Pack text, code, JSON or Markdown into a compressed link with optional AES-256 password protection. Nothing is stored on a server.
- HTML, CSS & JavaScript Playground — Write HTML, CSS and JavaScript in three editors and see the result in a live sandboxed preview that updates as you type.
- Text & Code Diff Checker — Compare two texts or files side by side or in unified view, highlight word or line changes, and download the differences as a patch file.
- .htaccess Redirect Generator — Generate Apache .htaccess rules to force HTTPS, set www or non-www, add a 301 redirect, block an IP address and enable GZIP compression.
- JSON, HTML, CSS, SQL & XML Formatter — Beautify or minify JSON, HTML, CSS, SQL and XML in one place. Paste your code, pick the language and copy clean, indented output.
- Regex Tester & Code Generator — Test regular expressions against sample text, see every match and capture group, preview replacements and copy code in four languages.
- JSON to Types & Mock Data Generator — Turn a sample JSON object into TypeScript, Go, Python or Rust types, and generate arrays of 5 to 50 mock records from the same shape.
- HAR File Viewer — Open a HAR file to list every network request with method, status, time and size, filter by URL or method, and read response bodies.
- CSS Glassmorphism & Box Shadow Generator — Adjust sliders to design frosted-glass panels and soft box shadows with a live preview, then copy the ready-made CSS code.
- cURL to Code Converter — Paste a cURL command and get matching request code in TypeScript, Python, Go or Rust, ready to copy into your project.
Data & Converters
CSV/JSON/XML, number bases, byte sizes, units and data files
- SQLite Database Browser and SQL Runner — Open a SQLite database file, browse its tables, run SQL queries, and export results to CSV or JSON. The file is opened locally and never uploaded.
- YAML to JSON and TypeScript Converter — Paste YAML or JSON config and instantly get formatted YAML, formatted JSON and a TypeScript interface side by side, with clear parse errors.
- Zstandard (.zst) Decompressor and Viewer — Decompress .zst, .tar.zst and .tzst files in your browser, preview JSON, CSV, Parquet or text inside, and download the result or a ZIP.
- Parquet File Viewer and CSV/JSON Export — Open a Parquet file in your browser to search, sort and page through rows, inspect column types, and export the data to CSV or JSON.
- CSV, JSON, XML and HTML Table Converter — Convert CSV to JSON, JSON to CSV, CSV to an HTML table, or JSON to XML. Paste your data and the output updates as you type.
- Binary, Hex, Octal and Decimal Converter — Type a number in binary, octal, decimal or hexadecimal and see the other bases update instantly, along with its ASCII character.
- Byte Size Converter (KB, MB, GB, TB, GiB) — Enter a size in bytes to see it in KB, MB, GB and TB plus binary KiB, MiB and GiB, so decimal and binary units are easy to compare.
- Length, Weight, Temperature, Speed Converter — Convert length, weight, temperature and speed between metric and US units, such as meters to feet, kilograms to pounds or Celsius to Fahrenheit.
Text & Lists
Sort and clean lists, HTML to text, plus Markdown editing and reading
- Markdown to HTML Live Editor — Write Markdown with a live HTML preview, track word count and reading time, and copy either the Markdown source or the rendered HTML.
- Markdown File Reader — Open .md files in a clean reading view with frontmatter, a table of contents and tabs for several files, and export each one to HTML.
- HTML to Text Converter: Extract Text from HTML — Convert HTML to plain text online. Extract clean readable text from HTML code, files or emails, keeping paragraphs, lists and tables, plus all links.
- Text & List Editor: Sort, Clean, Convert — Sort or shuffle lines, remove duplicates and blank lines, change case, find and replace, and count words and characters in one text editor.
- Word Counter with Reading Level and Keyword Density — Count words, characters, sentences and pages as you type, with reading level, reading and speaking time, keyword density, writing goals and read-aloud.
- Character Counter with Length Limits — Count characters with and without spaces as you type and see how much room is left for title tags, meta descriptions, text messages and social posts.
- Keyword Density Checker — Find the words and 2, 3 and 4-word phrases you repeat most, with counts and percentages, and filter out common words so the real keywords stand out.
- Case Converter: Sentence, Title, Upper, Lower — Switch text to Sentence case, lower case, UPPER CASE, Title Case, alternating or inverse case in one click, then copy it. Undo restores the original.
- Words per Page Calculator — Estimate how many pages a word count fills, or how many words you need for a page count, by font, font size and single, 1.5 or double line spacing.
- Word Count Difference: Before and After Editing — Paste the original and edited versions of a text to see how many words, characters, sentences and paragraphs were added or cut, with percentages.
- Random Word Generator — Generate up to 50 random nouns, verbs or adjectives, optionally starting with chosen letters, for writing prompts, games, names and brainstorming.
Math & Randomness
Calculator, percentages, rule of three, dice and random numbers
- Scientific Calculator — On-screen calculator with parentheses, square root, base-10 log, pi and sine, cosine and tangent in radians. Click buttons and press = to solve.
- Percentage Calculator — Work out what X percent of a number is and the percentage increase or decrease between two values, with results updating as you type.
- Rule of Three Calculator — Solve proportions with the rule of three: enter A, B and C to find X, with a switch for inverse proportion problems like workers versus hours.
- Dice Roller and Coin Flip — Roll one to four six-sided dice or flip a coin. See each die, the total of every roll, and a short history of your recent rolls and tosses.
- Random Number Generator — Generate a set of random whole numbers between a minimum and maximum you choose. Set the quantity and get a fresh list with one click.
Color Harmonies
Color codes, harmonies, blending and WCAG contrast
Date & Time
Date difference, date math, timer and stopwatch
- Date Difference and Business Days — Pick two dates to see the days between them, the weekday-only business day count, weeks and days, and an approximate number of months.
- Add or Subtract Days from a Date — Add or subtract days, weeks, months or years from any date and see the resulting calendar date, including its weekday, right away.
- Countdown Timer — Start a countdown with preset lengths of 1, 3, 5, 10 or 25 minutes. Pause and resume anytime, and hear a short chime when time runs out.
- Online Stopwatch with Laps — Time anything to the hundredth of a second. Start, pause and resume, record lap times while running, and reset to clear the clock and laps.
Network & Internet
Internet speed test with ping, jitter and latency under load