A JSON Web Token (RFC 7519) is a compact claim format with Header, Payload, and Signature segments, each Base64URL-encoded and joined by dots.

Is my JWT sent to a server when I decode it?

No. Decoding runs entirely in your browser; the token never leaves your device.

How do I decode JWT online?

Paste the full JWT to decode header and payload instantly. For HS algorithms, enter your secret to verify locally.

Why can't I verify an RS256 signature here?

Asymmetric algorithms need the public key on a server; this tool only verifies HMAC (HS*) locally.

JWT Decode Online - Decoder & Validator

JWT Decode Online

JWT decode online free. Parse JSON Web Token headers, payloads, and signatures in your browser—no upload. Supports HS256, RS256, and more for API debugging.

Enter JWT Token

Part of tool topic

JWT Debugging & API Auth Tools

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