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JWT Encoder

Build and sign JSON Web Tokens. Edit header and payload JSON, choose an algorithm, and generate a signed token.

Encoder

Signing key

Signed JWT

Security

Client-side onlyAll decoding, verification, and signing runs in your browser. Nothing is sent to a server.
Production tokensAvoid pasting real production JWTs or signing secrets into any online tool.
Payload dataJWT payloads are only Base64URL-encoded, not encrypted. Never store sensitive PII in claims.
ExpirationUse short-lived access tokens and refresh flows instead of long-lived JWTs.