Base64 / URL / JWT Codec

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Encode and decode Base64, URLs, and JWTs entirely in your browser.

100% client-side · no data leaves this device

Input

Output

{
  "header": {
    "alg": "HS256",
    "typ": "JWT"
  },
  "payload": {
    "sub": "kw-user",
    "name": "KeyboardWarrior",
    "iat": 1700000000,
    "role": "dev"
  },
  "signature": "signature-demo-only"
}