Developer

JWT decoder

Decode and inspect JSON Web Token headers, payloads, and expiration claims. Nothing is sent to a server.

100% private. All processing happens locally in your browser — no files or data are ever sent to a server.

How to use JWT decoder

01 Paste or type your input into the text field provided
02 The output generates instantly as you type
03 Click Copy to send the result straight to your clipboard

Frequently asked questions

Common questions about JWT decoder.

Is JWT decoder free to use?

Yes, JWT decoder is completely free. No account, subscription, or payment is ever required — just open the page and start using it.

Does JWT decoder upload my data to a server?

No. JWT decoder runs entirely in your web browser using client-side JavaScript. Your files, text, and data never leave your device, making it 100% private.

Can I use JWT decoder on my phone or tablet?

Yes. JWT decoder is fully responsive and works on all modern smartphones, tablets, and desktop browsers without installing any app.

Does JWT decoder work without an internet connection?

Yes. Once the page has loaded, JWT decoder works fully offline — all processing is done locally in your browser.

More Developer tools

JSON formatter

Prettify, validate, and minify JSON. Highlights syntax errors in real time.

Developer

Base64 encoder

Encode text or files to Base64 format. Essential for embedding assets in code.

Developer

Base64 decoder

Decode Base64 strings back to plain text or binary data.

Developer

About JWT decoder

JSON Web Tokens (JWTs) are a compact, URL-safe format for transmitting signed information between parties. A JWT consists of three Base64url-encoded sections separated by dots: a header (algorithm and token type), a payload (claims including user ID, roles, issued-at, and expiration time), and a cryptographic signature. The JWT Decoder extracts and formats the header and payload for easy inspection, checks whether the token has expired based on the 'exp' claim, and shows the issue and expiry times in readable format. All decoding is performed locally in your browser — tokens are never sent to a server. This is the safest way to inspect JWTs during development and debugging.