JWT Decoder

Paste a JSON Web Token to instantly decode its header, payload and claims. Everything runs in your browser — your token never leaves your device.

Invalid JWT format
Header Algorithm & token type
Payload Claims & data
Signature
Signature verification requires your secret key and cannot be done client-side securely. This tool decodes only — do not trust unsigned tokens in production.
Related Tools
64
Base64 Encode / Decode
Encode and decode Base64 strings
#
Hash Generator
MD5, SHA-1, SHA-256 & SHA-512
{ }
JSON Formatter
Pretty print and validate JSON
%20
URL Encode / Decode
Percent-encode and decode URLs
⇄
Text Diff Checker
Compare two texts and spot changes
🕐
Timestamp Converter
Convert Unix timestamps to dates