JWT Viewer
JWT Viewer decodes a JWT header and payload and shows the algorithm and claim status, without verifying the signature. Free, fast, and completely private.
JWT Viewer is a browser-based web developer tool on WebDevToolsBase. JWT Viewer decodes a JWT header and payload and shows the algorithm and claim status, without verifying the signature. Free, fast, and completely private. To use it, paste your input and view the result directly in your browser — no signup and nothing to install.
JWT Viewer is a free JWT Tools utility that runs entirely in your browser — nothing you enter is uploaded.
How to use JWT Viewer
- Drop your JWT into the field at the top of JWT Viewer.
- Watch the output update instantly while you adjust the JWT.
- Finish by choosing Copy to take the output with you.
About this tool
JWT Viewer runs entirely in your browser. JWT Viewer decodes a JSON Web Token in your browser, showing the header and payload without verifying secrets remotely.
The token is parsed on your device and never transmitted. Your input never leaves the page, and no account or install is required.
Frequently asked questions
What is JWT Viewer for?
Use JWT Viewer to process your input without installing anything; everything happens client-side.
Do I need an account for JWT Viewer?
No — JWT Viewer needs no account, sign-up or installation.
Does JWT Viewer upload my data?
No — JWT Viewer processes everything locally in your browser, so nothing you enter is uploaded or stored.
Does JWT Viewer verify the JWT signature?
JWT Viewer decodes the token locally so you can inspect its header and payload; verification needs the matching key.
Can I use JWT Viewer without a connection?
Yes — after the first load JWT Viewer runs entirely offline.