Is my JWT token safe when using this tool?

Absolutely. All decoding, verification, and generation happen directly in your browser. Your tokens never leave your device.

Can I verify JWT signatures?

Yes, you can paste your secret key (HS256) or public key (RS256) to verify the signature locally.

Use the 'Batch' tab. Paste multiple tokens (one per line) and decode them simultaneously.

Yes, the 'Generate' tab allows you to create JWTs with custom payloads and secret keys for testing purposes.

Decode, verify, batch, and generate — all in your browser.

Verify Signature (optional)

Header

{ }

Payload

{ }

Signature

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Standard Claims Explained

iss Issuersub Subject aud Audienceexp Expiration Time nbf Not Beforeiat Issued At jti JWT ID

🔒 100% Private?
All processing happens locally in your browser. No data leaves your device, ever.

⏱️ Expiration Detection
Automatically highlights expired tokens and shows remaining validity period.

📦 Batch Decode
Paste multiple JWTs (one per line) or upload a file to decode them all at once.

🛠️ Generate & Verify
Create test tokens with custom payloads and verify signatures using HS256/RS256.

📋 History & Export
Recent tokens are saved locally; export batch results as CSV for further analysis.

❓ What is JWT?
JSON Web Token is a compact, URL-safe means of representing claims to be transferred between two parties.

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