JWT Decoder & Verifier
Paste a JSON Web Token to decode and inspect its header, payload, signature and key claims (iss, exp, iat, aud, sub). Verify HMAC signatures locally — your token and secret never leave the browser.
About JWT Decoder & Verifier
Decode and inspect JSON Web Tokens (JWT) online. View header, payload, signature, expiry & claims. Verify HS256/HS384/HS512 signatures locally — never sent to any server.
Our free JWT Decoder & Verifier on AllOnlineTools.org helps you get results in seconds without installing software or creating an account. It is designed for everyday users, professionals and students who need a reliable developer utility online.
Everything runs in your web browser when possible, so your content stays on your device. We do not store your files or text on our servers for these client-side tools. Open the tool, complete your task, and download or copy the result — that is it.
How to use JWT Decoder & Verifier
- Open JWT Decoder & Verifier on AllOnlineTools.org.
- Paste or type your input into the text area.
- Choose options (format, encode/decode, sort order, etc.) if shown.
- View the result instantly in your browser.
- Copy or download the output.
Why use our JWT Decoder & Verifier?
- Format, validate and minify code in the browser
- JSON, HTML, CSS, JavaScript and more
- Nothing sent to a server unless you use a URL-fetch feature
- Free developer utilities — no install
- Copy output with one click
Frequently asked questions
Can this tool verify RS256 tokens?
This decoder inspects header and payload and can verify HMAC (HS256/384/512) signatures locally. RS256 verification requires the public key, which you can paste if the tool supports it.
Is it safe to paste my JWT here?
Tokens are processed in your browser and are not sent to our servers. Still, avoid sharing live production tokens in untrusted environments.
What if my token is encrypted (JWE)?
JWE tokens cannot be decoded without the decryption key. This tool is for standard signed JWTs.
Is the JWT Decoder free?
Yes. Free with no account required.