JWT Decoder & Encoder
Paste a JWT to instantly decode its header, payload, and verify the signature. Encode new tokens with HMAC, RSA, or ECDSA signing. Supports all standard algorithms. Nothing is sent to any server.
Decode a JWTNo UploadFiles stay on your device
No SignupNo account required
Runs in BrowserWorks offline too
Free ForeverNo limits, no watermarks
What you get
- ✓Decode header, payload, and signature
- ✓Verify signatures (HMAC, RSA, ECDSA, RSA-PSS)
- ✓Encode tokens with all algorithms
- ✓Color-coded token display
- ✓Human-readable timestamps
- ✓12 algorithm sample tokens
Frequently asked questions
Is my JWT sent to a server?
No. All decoding, encoding, and signature verification happens in your browser. Your tokens never leave your device.
Which algorithms are supported?
HS256, HS384, HS512, RS256, RS384, RS512, ES256, ES384, ES512, PS256, PS384, PS512 — all standard JWA algorithms except EdDSA.
Free · No account · No upload · Works offline