Developer & Data
Encode, hash, decode and format the things developers deal with daily — JSON, Base64, URLs, JWTs, regex, colours, UUIDs, passwords, timestamps and archive formats. Free forever, no daily limit.
Free developer and data tools
These developer tools run entirely in your browser, so a token, a payload or a secret you paste in never leaves your machine. They are free forever with no daily limit and no account — the quick, no-nonsense utilities you reach for while building.
Which one do you need?
These are the small utilities you reach for in the middle of something else. Base64, URL encoder, Number base converter and Unix timestamp converter all work in both directions, so decoding is as easy as encoding. JSON formatter validates while it pretty-prints and tells you the line and column when something is wrong. CSV ⇄ JSON uses a proper RFC-4180 parser, so a comma inside a quoted field does not shred the row. JWT decoder shows a token’s header and payload without sending it anywhere. Hash generator does SHA-1, SHA-256 and SHA-512 through the browser’s own crypto, and Bcrypt password hash is a separate tool on purpose. UUID generator, Password generator, Regex tester and Color converter finish the set.
Common questions
Is it safe to paste a token or a secret here?
Yes, and this is the category where it matters most. Every tool on this page runs in your browser, through the Web Crypto API or plain JavaScript. Nothing is sent to us, so a JWT, an API key or a password you paste never leaves your machine. You do not have to take our word for it: open your browser’s network tab and watch that no request goes out.
Are these free forever?
Yes. This whole category is free, permanently, with no daily limit and no account. They cost us nothing to run because your own device does the work — and they are how a lot of people find the site in the first place.
Why is bcrypt a separate tool from the hash generator?
Because the two exist for opposite reasons. SHA-256 is built to be fast, which is what you want for a checksum and precisely what you do not want for a password. Bcrypt is deliberately slow and salted. Putting them behind one button would quietly invite the wrong choice.