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JWT Base64URL Encoder Decoder

Encode and decode JWT Base64URL strings, convert JWT header and payload JSON, add or remove padding, and compare Base64 with Base64URL directly in your browser.

Choose a Base64URL Task

Paste a JWT header, payload, signature-safe Base64URL value, or a full JWT separated by dots.

Options

Pretty JSON formats decoded or encoded JSON with indentation.

Output

JWT Base64URL output will appear here.
JWT Base64URL encoding and decoding happens directly in your browser. Your token parts and pasted text are not uploaded to a server.

Encoding and Decoding JWT Base64URL Parts

JWT header and payload parts use Base64URL encoding. It looks similar to normal Base64, but it replaces characters that can be awkward in URLs and usually removes padding. That is why JWT parts often contain hyphens and underscores instead of plus and slash.

This JWT Base64URL Encoder Decoder helps you decode JWT parts into readable JSON, encode JSON into JWT-safe Base64URL, and convert between normal Base64 and Base64URL formats.

Working With JWT Header and Payload Text

  1. Choose whether to decode, encode, or convert Base64 formats.
  2. Paste a full JWT, JWT part, JSON, text, Base64, or Base64URL value.
  3. Select clean output, JSON, or explanation output.
  4. Review decoded parts, warnings, and formatting notes.
  5. Copy the result for debugging, documentation, or local testing.

Common JWT Base64URL Use Cases

  • Decoding a JWT payload without verifying the signature.
  • Encoding a sample JWT header or payload for testing.
  • Converting Base64 strings into URL-safe Base64URL text.
  • Adding or removing Base64URL padding.
  • Checking whether a JWT part contains valid JSON.
  • Preparing safe examples for API documentation or debugging notes.

Example JWT Payload

{
  "sub": "1234567890",
  "name": "Yoryantra User",
  "iat": 1717075200
}

This Does Not Verify JWT Signatures

Base64URL decoding only turns JWT parts into readable text. It does not prove that the token is valid, trusted, unexpired, or signed with the correct key.

Use this tool for reading and formatting JWT parts. For real authentication or authorization decisions, your application must verify the JWT signature and claims on the server.

Frequently Asked Questions

What is Base64URL in JWT?

Base64URL is a URL-safe version of Base64 used by JWT header and payload parts. It uses - and _ instead of + and /.

Can this decode a full JWT?

Yes. Paste a full JWT and the tool will decode the header and payload parts when possible.

Does this verify the JWT signature?

No. This tool only encodes and decodes Base64URL text. It does not verify signatures or token trust.

Should I paste real tokens here?

Avoid pasting real production tokens into any online tool. Use safe test tokens or remove sensitive values before sharing.

Is my JWT uploaded anywhere?

No. Encoding and decoding happens directly in your browser, and your input is not uploaded to a server.