JWT Generator — Create HS256 Tokens Online

Generate signed JWT tokens with HMAC-SHA256. Edit the header and payload as JSON, enter a secret, and get a color-coded JWT. 100% browser-based using Web Crypto API.

Warning: This tool is for development and testing purposes only. Do not use it to generate tokens for production authentication systems. Never share real secrets in online tools.

Frequently Asked Questions

JWT (JSON Web Token) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. It consists of three parts: a header (algorithm and token type), a payload (claims), and a signature. The signature ensures the token has not been tampered with.
HMAC-SHA256 (HS256) is a symmetric signing algorithm for JWTs. It uses a shared secret key to create a hash-based message authentication code. Both the sender and receiver must have the same secret key. This tool uses the Web Crypto API (SubtleCrypto) for cryptographic operations.
No. This tool is intended for development, testing, and learning purposes only. Never enter production secrets or generate tokens for real authentication systems using online tools. In production, generate tokens server-side using your backend framework's JWT library.

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Last updated: June 2026