What is JWT Decoder?
Free online JWT decoder. Parse JSON Web Token headers, payloads, and signatures. Auto-decode Base64 content, show expiry and issued-at times in real time. All decoding happens locally — tokens are never uploaded.
Use Cases
- ◆Token debugging
- ◆API auth troubleshooting
- ◆JWT learning
- ◆Security auditing
How to Use
- 1Paste JWT token
- 2Auto-decode all three parts
- 3View payload and expiry
- 4Copy needed fields
Features
- ✓Three-part parsing
- ✓Auto Base64 decode
- ✓Expiry check
- ✓Browser-based
FAQ
What is the difference between JWT and JWE?
JWT is encoded (not encrypted) — anyone can decode it. JWE is encrypted and requires a key to read.
Is my token uploaded?
No, all decoding happens locally in your browser.
Is this tool free?
Yes — completely free. No accounts, no paywalls. Just open the page and go.
Does my data get sent to a server?
No. Everything runs in your browser. Your data never leaves your device.
Does it work on my phone?
Absolutely. Works great on phones, tablets, and desktops alike.
How fast is it?
Instant for most inputs. Large datasets might take a second or two.