JWT Payload Decoder
Decode JWT payload online free. Extract claims and header. Browser-based.
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JWT Payload Decoder
Paste a JWT and decode its middle (payload) segment to JSON.
Why it matters: A JWT decoder helps you inspect claims without verifying signatures.
How to use Base64
- 1 Type or paste your text into the input box above.
- 2 Click Encode to turn text into Base64, or Decode to convert it back.
- 3 Toggle URL-safe mode for links, or UTF-8 for emoji and accents.
- 4 Use JWT / API-key / JSON modes for developer workflows.
- 5 Copy the result or open a specialized tool from the hub below.
Frequently Asked Questions
The middle part of a JWT (separated by dots) containing claims like user ID, roles, and expiration time, encoded in Base64URL.
Yes. We only decode the payload locally. We never validate signatures or send tokens to any server. Never share secret keys.
The signature is cryptographic hash, not Base64-encoded data. It's meant to be verified, not decoded. Encoding and decoding happen entirely in your browser, so your text never leaves your device. The tool supports standard, URL-safe, and UTF-8 Base64 modes.
You can view it, but editing it breaks the signature. Only the issuer can create valid JWTs. Encoding and decoding happen entirely in your browser, so your text never leaves your device. The tool supports standard, URL-safe, and UTF-8 Base64 modes.
No. The signature is a cryptographic hash, not encoded data. It is meant to be verified, not read. Encoding and decoding happen entirely in your browser, so your text never leaves your device. The tool supports standard, URL-safe, and UTF-8 Base64 modes.
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Encode, decode, and inspect Base64 for web, APIs, and JWTs.
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