JWT Decoder
Decode any JWT's header, payload, and signature — with human-readable expiry timestamps. 100% local.
JWT Token
Registered Claims
Human-readable timestamps from the payload.
Expiration (exp)
9/23/2025, 4:00:00 AM — EXPIRED
Issued at (iat)
8/24/2025, 1:46:40 AM
Epoch (unix) exp
1758600000
Header
Algorithm and token type.
{
"alg": "HS256",
"typ": "JWT"
}Payload
Claims contained in the token.
{
"sub": "1234567890",
"name": "CompressPix",
"iat": 1756000000,
"exp": 1758600000
}Signature
Raw signature segment (not verified — verification needs the secret key).
21 characters · decoded locally, signature not cryptographically verified
Raw Token
Decoded in your browser — the token never leaves your device.
By Vizo ToolLast updated August 20264 min read
JWT Decoder — Decode Header, Payload & Expiry
The JWT Decoder breaks a JSON Web Token into its three parts — header, payload, and signature — with everything decoded and pretty-printed for you. It also surfaces the registered claims like exp, iat, and nbf as human-readable timestamps, so you can see exactly when a token expires.
Great for debugging auth flows, verifying token contents during development, or checking whether a token is still valid. Decoding happens entirely in your browser — tokens are never sent anywhere.
- Header & payload decode
- Expiry & timestamps
- Human-readable times
- 100% browser-based
Why Use JWT Decoder?
Full Token Breakdown
Header, payload, and signature separated and labeled clearly.
Human-Readable Claims
exp, iat, nbf, and more shown as readable local dates, not epoch numbers.
Expiry Awareness
Instantly see if the token is expired, and when it will expire.
100% Private
Decoding runs in your browser — tokens never leave your device.
Features
Three-Part Decoding
Header, payload, and signature displayed in separate panels.
Pretty-Printed JSON
Both JSON parts are formatted for easy reading.
Claim Timestamps
exp, iat, and nbf rendered as human-readable dates.
Expiry Status
A badge shows whether the token is valid, expired, or not yet valid.
Copy Segments
Copy the raw token or any decoded segment with one click.
Signature Info
Shows the signature length so you can verify it was signed.
How to Decode a JWT
Decode any JWT in three steps.
Paste the token
Paste your JWT (the full three-part token) into the input.
Read the breakdown
Header and payload appear decoded; exp, iat, and nbf show as readable dates.
Check expiry & copy
See the expiry status, then copy any segment you need.
Frequently Asked Questions
Got questions? We've got answers.
What is a JWT?▼
A JWT (JSON Web Token) is a compact token with three Base64URL-encoded parts: header, payload, and signature, used for authentication and authorization.
Is the JWT decoder free?▼
Yes, completely free with no sign-ups.
Are tokens sent anywhere?▼
No — decoding happens entirely in your browser.
Does it verify the signature?▼
No, this tool decodes and displays the contents. Signature verification requires the secret key and is done on the server.
What is the exp claim?▼
exp is the expiration time of the token, shown here as a human-readable date plus a valid/expired badge.
What are iat and nbf?▼
iat is the issued-at time and nbf is the not-before time — both are rendered as readable dates.
Can I copy the decoded payload?▼
Yes, copy the pretty-printed payload or the raw token with one click.
Why is my token showing as expired?▼
The exp claim is in the past. If you believe it should be valid, check your token generation time and clock.
Does it work with any JWT algorithm?▼
Yes, it decodes the header regardless of algorithm (HS256, RS256, ES256, etc.) — decoding doesn't need the key.
Can I paste an access token from my app?▼
Yes, any standard three-part JWT works. Remember: only paste tokens you're allowed to see.
Does it work on mobile?▼
Yes, fully responsive.
What's the difference between a JWT and a session?▼
A JWT is stateless — the server validates the signature without storing session data. This decoder helps you inspect what's inside a token.
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