How to use the JWT Decoder (No Signature Verification)
Fill in the fields above and the result appears straight away. Everything runs in your browser, so nothing you type is uploaded.
How it works
Base64URL-decode the first two JWT segments.
Examples
- With the default values
Header: { "alg": "none" }
Limitations and assumptions
JWTs are credentials. Decoding is not verification or decryption. Never paste live production tokens into an untrusted tool.
Frequently asked questions
What does the JWT Decoder (No Signature Verification) do?
Decode the header and payload of a compact JSON Web Token locally. This does not verify its signature.
How does the JWT Decoder (No Signature Verification) work?
Fill in the fields above and the result appears straight away. Everything runs in your browser, so nothing you type is uploaded.
What should I keep in mind when using the JWT Decoder (No Signature Verification)?
JWTs are credentials. Decoding is not verification or decryption. Never paste live production tokens into an untrusted tool.
Can I see an example of the JWT Decoder (No Signature Verification)?
Decoding reveals the JSON header and payload but does not establish authenticity.
Is the JWT Decoder (No Signature Verification) free to use?
Yes. It is free, needs no account and runs in your browser.