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JWT Decoder & Builder

Decode, verify signatures, and generate JWT tokens with full payload inspection.

JWT Token
Header
Payload
Signature

Signature cannot be verified without a secret. Use the Verify tab.

⚠️
JWT Token
Algorithm
Secret (HMAC)
Public Key (PEM)
⚠️
Header
Payload
Algorithm
Secret (HMAC)
Private Key (PKCS#8 PEM)

Need EC keys, larger RSA, or JWK output? Open the Key Pair Generator →

Public Key — use this to verify
Generated JWT
Header Payload Signature
⚠️
Saved tool data