Encoded JWT
Verify Signature with Secret/Key
Decoded Header
Decoded Payload
What is JWT Decoding?
JSON Web Tokens (JWT) are compact, URL-safe tokens used for securely transmitting information between parties. A JWT consists of three parts: header, payload, and signature. This tool decodes JWTs to reveal the header and payload contents, and can verify the signature to ensure the token hasn't been tampered with.
How to Use the JWT Decoder Tool
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Paste your JWT token into the input field. The tool automatically decodes it in real-time.
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View the decoded header and payload as formatted JSON.
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Optionally, verify the signature by entering the secret key (for HMAC algorithms like HS256) or public key in PEM format (for RSA/ECDSA algorithms).
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Use the copy buttons to copy any field content to your clipboard.
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The tool supports multiple algorithms: HS256, HS384, HS512, RS256, RS384, RS512, ES256, ES384, ES512.
This free online JWT decoder is fast, secure, and works entirely in your browser. No data is sent to any server. Perfect for developers, security professionals, and anyone working with JSON Web Tokens. The tool provides instant decoding and signature verification for HMAC, RSA, and ECDSA algorithms.
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