Developer
JWT decoder
Decode JWT header and payload locally.
LocalFree
This tool runs on your device in the browser.
Instructions and limitations
TOOL GUIDE
What this tool is for
JWT decoder — Decode JWT header and payload locally.
Useful for development, debugging, and local testing before you move reviewed output into a production project.
Common uses
- Test sample data locally
- Debug a development task
- Prepare reviewed project output
Learning and testing use
Review all output before production use. Do not paste API keys, access tokens, passwords, or other production secrets into analysis or testing tools.