JWT Decoder

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Decode JWT header and payload locally. Default status is Decoded / Signature NOT verified; optional HS256 verify is separate from expiration checks.

Security uses 17.03.2026 Free Browser

JWT Decoder

JWT Token

Privacy: the token stays in your browser. Nothing is uploaded.

Optional HS256 signature verification

Only after you verify here will the UI say signature verified or failed. Decoding alone never implies a valid signature.

Secret key (HS256)

Verification result

Enter a secret key to verify signature

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JWT Decoder

JWT Decoder

JWT Structure

Header

Payload

Signature

Token Analysis

Custom claims

Optional HS256 signature verification

What is JWT Decoder?

How to Use

Frequently Asked Questions

JWT Decoder

JWT Decoder

JWT Structure

Header

Payload

Signature

Token Analysis

Custom claims

Optional HS256 signature verification

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What is JWT Decoder?

How to Use

Frequently Asked Questions