How to Use JWT Decoder

Decode and inspect JSON Web Token header and payload. Free, no signup, works offline.

Step-by-Step Guide

1
Open JWT Decoder
Navigate to the JWT Decoder tool page on DevKit. No signup or download required.
2
Enter your input
Paste or type your data in the input area. All processing happens locally in your browser — nothing is sent to any server.
3
Click the action button
Press the main action button to process your input. Results appear instantly below.
4
Copy the result
Click the "Copy" button to copy the output to your clipboard. You can also use the Share button to create a shareable link.
5
Switch direction
Many converter tools work both ways. Use the alternate button to reverse the conversion.
6
Check your history
Your last 10 results are saved locally. Click "History" below the tool to access previous outputs.

•All data stays in your browser. Safe for sensitive information like API keys and tokens.
•Use Ctrl+K (Cmd+K on Mac) to quickly search and jump to any tool.
•Star your favorite tools for quick access from the homepage.
•Tip: Never paste production JWTs into online tools that send data to a server. DevKit is safe — it decodes locally.