JWT Decoder
Decode a JSON Web Token's header and payload (does not verify the signature). Free, fast, no sign-up required.
How to use JWT Decoder
- Open the tool at the top of this page.
- Upload your file or enter your text/data.
- Click the action button and download your result instantly — no sign-up needed.
About JWT Decoder
Category: Developer Tools. Decode a JSON Web Token's header and payload (does not verify the signature). No account or installation required. Works on any device — Windows, Mac, Android, iPhone.
Free limit: 40 MB per file · Premium limit: 500 MB per file · Files auto-deleted in 1 hour.
Frequently Asked Questions
Is this tool free?
Yes. Toolysite is 100% free to use. No account required.
Do I need to install anything?
No. Everything works online in your browser. No software download needed.
Is my data safe?
Yes. Your files are processed securely, never shared, and automatically deleted within 1 hour.
What is the file upload limit?
Free users can upload up to 40 MB — which is higher than most tools websites. For larger files up to 500 MB, upgrade to Premium.