Data & Text
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) instantly. Paste any JWT to see the decoded header, payload, signature status, standard claim explanations, expiration risk, issuer/audience checks, and a copyable claim audit handoff that avoids raw token values.
Runs in your browser
Nothing uploaded
Free, no signup
Ctrl + Enter to run · Recent brings back your last inputs · Everything stays in this browser
FAQ
JWT Decoder: questions
Is it safe to paste my JWT here?
Decoding and the claim audit happen 100% in your browser — your token never leaves your machine. Treat JWTs like passwords and avoid pasting production tokens in shared environments.
Can this verify the signature?
No — verifying requires the secret key or public key. This tool decodes the Base64URL-encoded header and payload, flags risky claim patterns, and creates a verification checklist for your backend or CI review.
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