Developer tools

These pages format data, encode text, and generate values developers look up every day.

The work happens in this browser. Close the tab and the text is gone, because it was never uploaded.

Format JSON, hash text, decode a JWT, and generate UUIDs in the browser. What you type is not sent to a server.

Pretty-print or minify a JSON value.

Turn text or a file into Base64, or back.

Percent-encode text for a query string.

Make version-4 UUIDs, up to 100 at a time.

A hex digest for text or a file.

A random password of the length you set.

Read a JSON Web Token without checking its signature.

Seconds or milliseconds since 1970, and back.

See what a JavaScript pattern matches.

Move between a picker, hex, RGB, and HSL.

Rewrite the case of words you paste.

A live count of the text in the box.

See which lines changed between two texts.

A QR image for text or a URL you type.

Placeholder paragraphs that start with Lorem ipsum.