Developer tools
Quick developer utilities that run in your browser.
- No sign-up
- No watermark
- Files stay on your device
- 33 tools in one place
Photo: Daniil Komov / Unsplash
Most used
Most popular
- What is my IP?PopularThis page shows the public IP address that websites see when you connect, tells you whether…
- ASCII tablePopularEvery ASCII character from 0 to 127, plus the extended range 128–255, with decimal…
- Base64 encode and decodePopularConvert text to Base64 and back, turn any file into a Base64 string or data URI, and download…
- Color code converter (HEX, RGB, HSL)Type any color code or pick a color to get HEX, RGB, RGBA and HSL at once, ready to copy into…
- JSON formatter and validatorPaste JSON to pretty-print it, minify it or check that it is valid.
- Resistor color code calculatorClick the bands to read a resistor's value and tolerance, type a value to get its colors, or…
All other tools
27 more tools, A to Z.
- ASCII art generatorType a word and get it drawn in big block letters made of characters, ready to paste into a…
- Create ZIP fileZip files and entire folders in your browser.
- Cron expression generatorType a cron expression to see what it means in plain English and when it will run next, or…
- CSS grid generatorBuild a CSS Grid layout visually: set column and row sizes, gaps, and draw named areas by…
- CSS minifier and beautifierCompress your stylesheet for production and see how many bytes you saved, or turn minified CSS…
- CSV viewer and editorOpen a CSV file as a clean table in your browser, search and sort it, fix cells, add or delete…
- Fix text encoding (mojibake)Repair text where special characters turned into junk like é, ’ or –.
- Hash generator (SHA-256, MD5)Calculate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 at once for any text or file, then paste a…
- HTML entity encoderEscape text so it shows up literally in a web page instead of being read as HTML, or turn…
- HTML formatterTurn minified or messy HTML into neatly indented code, or compress it into a compact file…
- JavaScript formatterPaste cramped or minified JavaScript and get readable, consistently indented code back.
- JSON to CSV converterTurn a JSON array into a CSV table you can open in Excel or Google Sheets, or convert CSV back…
- JWT decoderPaste a JSON Web Token to see its header and payload, check whether it has expired, and verify…
- Markdown to HTML converterWrite Markdown and see the HTML and a live preview side by side, or paste formatted text from…
- Random string generatorCreate random strings for test data, tokens, coupon codes or IDs.
- Regex testerWrite a regular expression, paste some test text and see every match highlighted as you type…
- SQL formatterTurn a one-line or messy SQL query into clean, indented code with consistent keyword case, for…
- Subnet calculatorEnter an IP address with a prefix or mask to get the network, broadcast, first and last usable…
- Unicode characters and symbolsClick a symbol to copy it, from em dashes and curly quotes to arrows, math signs and check…
- Unicode escape converterTurn text into JavaScript, Python, HTML, CSS or URL escape sequences, and decode escapes back…
- Unix timestamp converterSee the current Unix time, turn any epoch timestamp into a readable date in your time zone and…
- Unzip files (ZIP, RAR, 7z)Open ZIP, RAR, 7z, TAR and GZ archives right in your browser.
- URL encode and decodePercent-encode text for safe use in links and query strings, or decode a messy URL back into…
- UUID generatorCreate random version 4 or time-sortable version 7 UUIDs, from one to ten thousand at a time…
- What browser am I using?Instantly see your browser name and version, operating system, screen and window size…
- XML formatterPretty-print messy XML with consistent indentation, check that it is well-formed, or minify it…
- YAML to JSON converterConvert YAML config files to JSON and back, or check a YAML file for syntax errors with the…
Recommended
Related categories
Text tools
68 tools
Count characters, change case, sort and clean up text, or copy special symbols in one click.
Explore →
People also use
- CM to inchesType a length in centimeters to get inches as a decimal, as a fraction you can find on a tape…
- KG to lbsConvert kilograms to pounds for body weight, luggage, gym plates or shipping.
- MM to inchesConvert millimeters to inches as a decimal and as the nearest fraction, handy for drill bits…
- Merge PDFCombine several PDFs and images into a single PDF.
- JPG to PDFPut one or many images into a single PDF.
- PDF to JPGSave each PDF page as a JPG image.
- Reverse image searchFind where an image comes from, spot fake profiles and locate higher-resolution copies.
- Meme generatorMake a meme from any picture: add bold top and bottom text with the classic outline, adjust the…