JWT Encoder/Decoder
Encode and decode JSON Web Tokens (JWT). Free online JWT encoder/decoder with signature verification and multiple algorithms support.
JWT Token
Header
Payload
Token Info
Token Info
Generated Token
Header
Payload
🔐 Signing Configuration
Generated JWT Token
About JWT Encoder/Decoder
Encode and decode JSON Web Tokens (JWT) with support for multiple algorithms including HMAC (HS256/384/512), RSA (RS256/384/512), and ECDSA (ES256/384/512). This comprehensive tool allows you to encode new tokens with custom headers and payloads, decode existing tokens to view their contents, and optionally verify signatures. All operations run entirely in your browser, ensuring your tokens and keys remain private and secure.
🔍 Decode Mode
Decode any JWT token to view its header, payload, and token information. Optionally verify signatures with your secret or public key (HMAC, RSA, or EC).
⚙️ Encode Mode
Encode new JWT tokens by defining custom headers and payloads. Supports symmetric (HMAC) and asymmetric (RSA, ECDSA) signing algorithms with text secrets, PEM, or JWK keys.
Security Note: Remember that JWT payloads are encoded, not encrypted. Never include sensitive information in the payload unless additional encryption is applied. Always verify tokens on the server side.
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