100% Client-Side

JWT Encoder

Free online JWT encoder. Create and sign JSON Web Tokens (JWT) with HS256, HS384, or HS512 directly in your browser. — runs 100% in your browser, client-side only. No data is sent to any server. Free to use, no account required.

Free Client-Side No Login No Storage
Loading tool...
JWT Decoder & Inspector Decode and inspect JWT tokens — header, payload, claims at a glance HMAC Generator Generate HMAC message authentication codes — SHA256, SHA512, SHA1, MD5 Base64 Encoder Encode text or binary data to Base64 — standard and URL-safe variants

How to Use the JWT Encoder

  1. Enter a JSON payload with your claims.
  2. Choose an algorithm (HS256/384/512).
  3. Enter a secret key for HMAC signing.
  4. Click Create JWT to generate the token.

Uses the Web Crypto API for HMAC signing. Your secret never leaves the browser. For RS256/ES256, use a library like jose.js.

What is JWT Encoder?

undefined

Common Uses

Frequently Asked Questions