Enter JWT Parts
Provide the header, payload, and signing credential.
JWT encoder
JWT encoder
- ✓Free to use
- ✓No registration
- ϟSimple workflow
- ✓Works on any device
Input & results
Enter your content and choose the action you need.
Configure your token claims
Build and sign JSON Web Tokens locally using HMAC, RSA, RSA-PSS, or ECDSA algorithms.
Configure the token parts and select Encode JWT.
Generated JWT Token
Your signed token and decoded preview appear here.
Your encoded JWT will appear here.
Decoded Preview
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Keep secrets and private keys safe. Signing happens only in your browser.
100% Secure
Payloads and keys never leave your browser.
Instant Encoding
Generate signed tokens without server delays.
Multiple Algorithms
HMAC, RSA, RSA-PSS, and ECDSA.
Copy & Export
Copy or download generated JWT tokens.
Privacy Focused
Secrets and payloads stay on your device.
Practical guide
How to use JWT encoder
What this tool helps you do
A JWT encoder constructs the header and payload representation used by JSON Web Tokens. Creating a token is not enough to make an authentication system secure: signing keys, allowed algorithms, claims, transport, expiry, and server verification must all be designed together.
When it is useful
- Learning JWT structure
- Creating non-production test fixtures
- Inspecting claim serialization
- Testing a controlled verification flow
A practical example
For a test token, include a short expiry, expected issuer and audience, then verify it with a separate trusted implementation configured to accept only the intended algorithm.
Limitations and common mistakes
Do not place secrets or unnecessary personal data in the readable payload. Never expose production signing keys in a browser tool, and do not accept unsigned or algorithm-confused tokens on a server.
Frequently asked questions
Is the payload encrypted?
No. Standard JWT payloads are encoded and readable unless a separate encryption standard is used.
Can I use a generated token in production?
Only tokens issued through your reviewed authentication system with protected keys should be trusted in production.