Developer Utilities

Small developer utilities that work as you type: decode JWTs, encode and decode Base64 or URLs, hash text and files, generate UUIDs and passwords, and convert timestamps.

How to use Developer Utilities

Pick a utility, such as JWT Decoder or Timestamp Converter.
Paste your token, text or value into the input.
Read the result, which updates as you type.
Use Copy to take the output with you.

Frequently asked questions

Is it safe to paste tokens and secrets here?

The encoders, hash, JWT, UUID, password, timestamp and cron tools run entirely in your browser and send nothing to a server. What's My IP is the one utility that contacts the server, because it needs to see your connection.

Do these tools work offline?

Once the page has loaded, everything except What's My IP works without a connection, since it is all computed locally.

Are the developer tools free?

Yes. There is no account, no rate limit and no sign-up.

All tools

Board: Hand-drawn whiteboard with live to-do, code, table and API cards. Multiplayer and encrypted.
Diff Checker: Compare two texts or files side by side. Line and word highlights, JSON mode, ignore whitespace, export a patch.
JSON Viewer: Paste JSON to validate, format, minify and explore it as a collapsible tree.
CSS Formatter: Beautify messy CSS or minify it for production. Handles nesting, @media and comments.
Developer Utilities: JWT decoder, Base64/URL/HTML encoder, hashes, UUID/ULID and password generators, timestamp converter, cron explainer and what's my IP.
PDF Tools: Edit, merge, split, compress, convert (Word, Excel, PowerPoint, JPG), OCR, sign, protect, unlock, redact and compare PDFs. Files stay on your device.
Image Tools: Compress, resize, crop and convert (HEIC to JPG, WebP, AVIF, Base64). Optimise and render SVGs. Generate QR codes, favicons and OG images.
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