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JWT Encoder

Generate HS256, HS384 or HS512 JSON Web Tokens directly in the browser for testing and local workflows.

Local

Runs locally in your browser by default — nothing is uploaded first.

Input

Algorithm

Secret

Header JSON

{
  "typ": "JWT",
  "alg": "HS256"
}

{
  "typ": "JWT",
  "alg": "HS256"
}

Payload JSON

{
  "sub": "uvlio-user",
  "iss": "uvlio",
  "role": "demo"
}

{
  "sub": "uvlio-user",
  "iss": "uvlio",
  "role": "demo"
}

The token preview updates automatically when header, payload, algorithm, or secret changes.

Result

Unsigned previewAdd a secret to sign the token

Use the token for local testing, demos, and browser-first API workflows.

Signing state

Unsigned preview

alg

HS256

Header

Payload

JWT token

text

eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ1dmxpby11c2VyIiwiaXNzIjoidXZsaW8iLCJyb2xlIjoiZGVtbyJ9.

JWT Encoder runs locally in your browser by default, so you can work with the content without uploading it first.

JWT Encoder: Generate HS256, HS384 or HS512 JSON Web Tokens directly in the browser for testing and local workflows. Run it in the browser and continue into related workflows when needed.

Handle one-off tasks quickly
Finish the first step directly in the browser
Continue into related tools for the next action

Does JWT Encoder run locally or in the cloud?

JWT Encoder runs locally in your browser by default, so you can work with the content without uploading it first.

What usually comes after JWT Encoder?

A common next step is to continue into related workflows such as Code and Data Formatting Tools.

Is a JWT encrypted?

A standard signed JWT is not. The payload is base64url text that anyone with the token can read. Encryption requires the separate JWE format.

Reading a JWT: What Decoding Shows and What It Proves

A JWT is three base64url segments, and decoding one tells you nothing about whether it is genuine. How to read the claims, and why tokens break in URLs.

collectionCode and Data Formatting Tools collectionID, Password and Hash Tools collectionCryptography and Security Tools

About JWT Encoder

JWT Encoder: Generate HS256, HS384 or HS512 JSON Web Tokens directly in the browser for testing and local workflows. Run it in the browser and continue into related workflows when needed.