A fast, private developer toolbox
These are the little utilities you reach for a dozen times a day — pretty- printing an API response, decoding a JWT, generating a UUID or hashing a string. Because they run entirely in your browser, they are quick and you can safely paste in tokens and payloads without them ever touching a server.
Tidy and check data with the JSON Formatter, JSON Diff and Text Compare. Convert with Base64, URL Encode/Decode, HTML Encode/Decode and Number Base Converter. Inspect and generate with the JWT Decoder, Hash Generator, UUID Generator, Case Converter, Color Converter and Lorem Ipsum generator. Learn more in our JSON formatting guide.
Frequently asked questions
Are these developer tools free? Yes — all of them are free with no sign-up and no usage limits.
Is anything I paste sent to a server? No. Every tool runs client-side in your browser, so tokens, hashes and JSON you paste never leave your device.
Can I use these on sensitive data? Because nothing is uploaded, these tools are safer for sensitive input than server-based ones — though you should still follow your own security policies.