How to use jwt decoder
- Paste text into the editor. Inputs are limited to one million characters.
- Choose an operation where available, then run the tool.
- Review the result, copy it or save a text file.
A simple example
A Base64URL JSON header and payload are decoded into separate fields. Claims are displayed as supplied.
What to keep in mind
No signature verification, login validation, key lookup, expiry validation or JWE decryption. Unsafe numeric values and nesting beyond 100 levels are rejected. Do not trust decoded claims for access decisions. Sensitive tokens stay in this browser.
Good questions. Clear answers.
Does my text leave the device?
No. This tool processes text in your browser and does not retain it.
Can I undo a change?
Your original input stays in the input editor. The result appears separately.