JWT Debugger - Encode & Decode Locally
Create signed JWTs with HS256/HS384/HS512 or decode tokens side by side. All cryptography runs in your browser; nothing is sent to a server.
Frequently asked questions
No. Signing and decoding use Web Crypto locally. Nothing is sent to LocalTools servers for processing.
The debugger shows segments; signature verification against trusted keys is a separate step your backend should perform.