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JWT Decoder
FreeNo signup required · Works in your browser
Paste a JWT and instantly see the decoded header, payload, and signature. Verify expiration times, check claims, and debug authentication issues. No data is ever sent to a server.
What you can do
Instant JWT header and payload decoding
Expiration time validation
Signature algorithm detection
Pretty-printed JSON output
Works offline — tokens never leave your browser
Popular templates
Pre-configured for your specific use case
Frequently Asked Questions
Is the JWT Decoder really free?
Yes, 100% free. No signup, no credit card, no hidden fees. Use it as many times as you need for any project.
Can I use it for commercial projects?
Absolutely. The output is yours — use it for personal projects, client work, or your startup. No restrictions.
Who built this?
Josué Barros, a software engineer (ex-Sephora · ex-Bradesco · ex-Indeed). Part of the BoilerForge free tools suite.