JWT Verify Online — RS256, ES256, HS256 vs Pasted JWKS
Verify a compact JWT signature against pasted JWKS or JWK in your browser. Optional audience, issuer, clock skew, and HS256 secret. Paste-only — no remote JWKS fetch. Signature verify ≠ authorization.
Developer notes
• Paste compact JWT + JWKS JSON (not a URL). • v1 algorithms: RS256, ES256, HS256. • verify ≠ trust or authorization. • Copy result never includes raw private JWKS material. • 512 KB per field.
Options
When teams pick this route
• Debug API auth with a JWKS from provider docs. • Check exp/aud/iss after jwt-decode. • Validate HS256 test tokens with jwt-encode fixtures.
Worked examples
RS256 JWT + matching JWKS
JWT
Result
documentation.securityTools.jwtVerify.examples.two.title
JWT
Result
Related tools
Decode without verify: jwt-decode. Sign HS256: jwt-encode. Inspect keys: inspect-jwks.
JWT verify FAQ
Paste-only verify
Can I paste a JWKS URL?
No. Paste the JSON body of the JWKS — nothing is fetched from the network.
Does verify mean the user is trusted?
No. This checks signature and optional claims only — not authorization or identity provider trust.
When should I use jwt-decode?
Use jwt-decode to read header/payload without verifying. Use this tool when you have the signing keys.
Which algorithms are supported?
v1: RS256, ES256, HS256. Others return unsupported_algorithm.
Security & tokens
JWKS, X.509 certificates, and secrets scan — browser-local.
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