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Use the labelled fields in the workspace above. If example values are provided, try them first or replace them with your own.
Developer tools · Free online tool
JWT decoder
Decode JWT header and payload claims locally and inspect common time fields.
3 guest runs per rolling 24 hours10 with a free accountPrivate inputsMobile-friendly
JWT decoder workspace
Runs locally in your browser
Important: this tool only decodes a token. It does not verify the signature or prove authenticity.
Decoded header
Decoded payload
Signature segment
Use it with confidence
How to use the JWT decoder.
Calculate and review
Use the main action when needed. The first two Base64URL segments are decoded and parsed as JSON; time claims are displayed as dates.
Try a worked example
Paste a three-part token to inspect alg, sub, iat and exp without transmitting the token.
Check the assumptions
Decoding does not verify the signature or prove that a token is authentic. Never treat this output as validation.
Helpful answers
JWT decoder FAQs.
Is the JWT decoder free?
Yes. Guests receive 3 runs per rolling 24 hours, verified free accounts receive 10, and Premium subscribers receive unlimited normal use.
Does UtilHub upload or save my inputs?
No. This tool runs in your browser and UtilHub does not receive or store the values you enter. Your browser or device may still retain normal local history or form data.
How does this JWT decoder work?
The first two Base64URL segments are decoded and parsed as JSON; time claims are displayed as dates.
What should I check before using the result?
Decoding does not verify the signature or prove that a token is authentic. Never treat this output as validation.