Free Online Tool

The Best Free JWT Decoder & Encoder

Paste any JWT and instantly see its decoded header, payload, and signature — all in your browser. Ideal for debugging auth issues without pasting secrets into third-party sites.

Open JWT Decoder — Free
No account required — ever Processed in your browser Free forever

What makes this the best free JWT Encoder & Decoder?

Decode any JWT token to see header and payload
Verify signature with your secret key (client-side)
Inspect expiry, issuer, and custom claims at a glance
100% browser-side execution
Encode new JWTs with custom payloads
Supports HS256, HS384, and HS512 algorithms

Common use cases

1

Debugging auth token contents during development

2

Checking if a JWT has expired without a server round-trip

3

Verifying token claims match what your backend sends

4

Generating test JWTs for API development

Why Tools Network?

100% Private

Everything runs in your browser. All processing is done locally. Safe for confidential work.

Instant Results

No uploads, no server delays. Results update as you type — because your browser does the work.

Always Free

No trial. No credit card. No paywall after 5 uses. Every tool on this site is free, forever.

Try JWT Encoder & Decoder now — free

No signup. No install. Open it in your browser and start using it in seconds.

Open JWT Decoder — Free