JWT Encoder

Encode and sign your JSON payload into a secure JWT using HS256.

Last Updated: October 2026
100% Client-Side — Your data never leaves your device

Why this tool is safe

Your data never leaves your device — everything runs in your browser.

No server uploads. Other tools send your files to their servers. Ours don't.
Zero tracking of content. We never see, store, or log anything you convert.
Works offline. Once loaded, the tool works without an internet connection.
No account required. Instantly use all tools completely free without signing up.

Frequently Asked Questions

Search below or browse through our most commonly asked questions.

No, this tool uses the Web Crypto API to sign your token entirely client-side. Your secret key and payload never leave your browser.

Related Tools

Base64 Converter

Encode text to Base64 or decode Base64 to text — all in one tool

JWT Decoder

Decode and inspect the header and payload of JSON Web Tokens (JWT) locally

HMAC Generator

Generate HMAC-SHA256/384/512 signatures and JWT tokens in your browser

JSON to Base64

Format, minify, and encode JSON to Base64 instantly. Validate your JSON before encoding