Free JWT Decoder Online
Use this free JWT decoder to read the header and payload of a JSON Web Token. Private, browser-based, and signature verification is never performed.
What is JWT Decoder?
JWT Decoder reads the header and payload of a JSON Web Token and shows them as readable JSON. It is useful for debugging authentication and inspecting claims such as expiry and issuer. This tool decodes only — it does not verify signatures.
How to use this tool
- Paste your JWT into the input box.
- View the decoded header and payload.
- Inspect the claims you need.
- Copy any section you want.
Features
- Decode the JWT header
- Decode the JWT payload
- Pretty-printed JSON output
- Copy header or payload
- Clear notice that signatures are not verified
This tool runs in your browser. Your files and text are not uploaded to our servers, and we do not store your input.
Frequently asked questions
Does this verify the JWT signature?+
No. This tool only decodes the token. It does not verify the signature, so never trust a token based on decoding alone.
Is it safe to paste a real token?+
Decoding happens entirely in your browser and nothing is uploaded. Still, avoid sharing production tokens that are currently valid.
Why can't my token be decoded?+
A JWT must have three Base64URL parts separated by dots. If it does not, the tool shows an error.
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