55 Free Online Developer, Design & Media Tools

55 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.

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.

Audio & Video

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, 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.
• 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.

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

• Color Picker, Palettes & Contrast Checker — Pick a color to get HEX, RGB and HSL values, see five harmony palettes, blend two colors, check WCAG contrast and build CSS gradients.

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.