JWT Decoder
Decodes JSON Web Tokens into their header and payload, pretty-printed with every registered claim (exp, iat, nbf, iss, sub, aud) explained and expiry checked against your clock — without sending the token anywhere.
Runs 100% in your browser — nothing you paste leaves your device.
Read the full guide to this tool
Notes
- Decoding does not verify the signature: the header and payload are just Base64Url-encoded JSON, readable by anyone who holds the token.
- Never paste production tokens into online tools that send them to a server — this one runs entirely in your browser.
- Runs 100% in your browser — nothing you paste leaves your device.
Explore the idea
Related tools
Base64 / URL / HTML Encoder-Decoder
Encode and decode Base64, hex, URL percent-encoding and HTML entities — with auto-detect, bulk lines and file drop.
Hash Generator
MD5, SHA-1/256/384/512, CRC32, file checksums, bcrypt and digest compare.
HMAC Calculator
HMAC-SHA256/512/1/MD5 with text or hex inputs, hex + Base64 output, and timing-safe verify.
String Length Inspector
Characters, UTF-8 bytes, UTF-16 units and graphemes of any text.
Byte Size Converter
Convert between KB, KiB, MB, MiB and friends.
CSS Gradient, Shadow & Radius Generator
Visual generators for gradients, box-shadows and border radii.