Developer and web tools
Encode, decode, check and convert the bits of text and data the web runs on. 12 free tools, with no sign-up. Nothing you enter leaves your device.
Encode and decode 4
- Base64 converterTurn text into Base64 and back (UTF-8 safe, so accents and emoji work), switch to URL-safe Base64, turn a file into Base64 or a data: URL, and save Base64 back as a file. #T877
- URL encoderPercent-encode text for a web address and decode it back, as a part (encodeURIComponent) or a whole address (encodeURI), and read a pasted address's query string as a table. #T850
- JWT decoderPaste a JSON Web Token to see its header and payload as tidy JSON, with iat, nbf and exp shown as dates and whether it has expired. The token stays on your device and the signature is not checked. #T851
- Hash checkerWork out the SHA-256, SHA-512, SHA-384, SHA-1 and MD5 hash of text or a file in your browser, and paste an expected checksum to see whether it matches. #T852
Text and data 5
- Regex testerType a regular expression and some text to see every match highlighted, each numbered and named group listed, and a live preview of a replacement with $1. #T853
- UUID generatorMake 1 to 500 UUIDs at once, random (version 4) or time-ordered (version 7), in upper or lower case, with or without hyphens. Copy or download them, or paste a UUID to see if it is valid and which version it is. #T854
- Timestamp converterTurn a Unix timestamp in seconds or milliseconds into a readable date in UTC, your own time and any time zone, with ISO 8601 and RFC 2822 forms and how long ago it was. Or turn a date back into a timestamp. #T855
- Sort linesPaste a list to sort it A to Z, Z to A, naturally (9 before 10) or by length, reverse or shuffle it, remove duplicate and blank lines, trim spaces and add line numbers, with counts before and after. #T856
- Slug makerTurn titles into URL slugs and safe file names: lower case, accents removed, hyphens or underscores, an optional length limit and many lines at once. #T912
Colours and icons 3
- Colour converterType or pick a colour and get HEX, RGB, HSL, CMYK and its CSS name, with tints, shades and WCAG contrast against white and black. #T857
- Favicon makerMake a favicon.ico plus 16, 32, 48, 180, 192 and 512 px PNG icons from your image or a letter on a colour, with the HTML to paste. Download them all as a zip. #T858
- Photo paletteChoose a photo and get its 5 to 10 main colours with HEX and RGB codes and how much of the picture each one covers. Copy them as CSS or save a swatch strip. #T859
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