Free online JWT and decoder. Decode JSON Web Token header, payload, and signature. Supports HS256, RS256 and other algorithms with signature verification (key required). Base64 decoding with pretty JSON display.
๐ก Tip: JWT has 3 parts separated by dots. Header and Payload are Base64URL-encoded JSON. All decoding happens locally in your browser.
How to Use the JWT Debugger
Encode or decode with the JWT Debugger in three steps:
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Enter Your Text or Data
Type or paste the text, string, or data you want to encode or decode into the input area. The tool supports standard text input and file upload for batch processing. -
Choose the Operation
Select whether you want to "Encode" or "Decode" your data, and optionally configure any algorithm-specific parameters (such as key size or hash type). -
Get the Result
The encoded or decoded output appears instantly. Click "Copy" to copy to your clipboard or "Download" to save. All computation happens on your device โ Enter JWT Token, Header and other inputs stay in your browser.
FAQ
About Free JWT Debugger - Online Tool
Free online JWT and decoder. Decode JSON Web Token header, payload, and signature. Supports HS256, RS256 and other algorithms with signature verification (key required). Base64 decoding with pretty JSON display. Try now!
How to Use Free JWT Debugger - Online Tool?
Enter your content in the input area, click the action button, and view the result. All computation happens on your device โ Enter JWT Token, Header and other inputs stay in your browser.