Free Online JWT Decoder

A JWT decoder splits an RFC 7519 token into its three Base64URL parts and pretty-prints the header and payload so you can inspect the claims.

Your data is processed entirely in your browser and never sent to any server.

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How to Use This Developer Tool

  1. Paste your JWT into the input area.
  2. Read the decoded header and payload as pretty-printed JSON.
  3. Check the exp claim — expired tokens are flagged inline.
  4. Use the per-field copy buttons to grab a specific claim.

What Is a JWT Decoder?

JWTs are the dominant token format for stateless authentication: a Base64URL-encoded header and payload joined to a signature by dots. The header and payload aren't encrypted — anyone with the token can decode and read the claims. The signature only proves the token wasn't modified, not that it's secret.

This decoder parses the structure, pretty-prints both segments as JSON, highlights the standard claims (`iss`, `sub`, `aud`, `exp`, `iat`, `nbf`), and flags expired tokens by comparing `exp` to the current epoch. Signature verification is intentionally not performed — that requires the issuer's public key. Decoding runs entirely in your browser so production access tokens stay on your machine.

Frequently Asked Questions

What does a JWT decoder show?
It decodes the header (algorithm, type) and payload (claims like sub, exp, iat) from the Base64 parts. It does NOT verify the signature—use your auth library for that.
Is it safe to paste my JWT?
JWTs often contain sensitive data. Use only with test tokens or in private. Never paste production tokens in public tools. Consider local/offline decoders.
Why can't I verify the signature?
Verification needs the secret or public key. Online decoders don't have your keys. Decoding is for inspection only; verification happens in your app.

Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.

Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.

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