JWT Decoder

How to use:

1. Paste your JWT token into the input box.
2. Click Decode JWT to see the header, payload, and signature in separate boxes below.
3. Copy any section you need using the Copy button at the top right of each box.
4. If your token is invalid, you’ll get a clear error message.

Why This JWT Decoder Is My Go-To (And Maybe Yours Too)

If you’ve ever worked with APIs, authentication, or modern web apps, you know how often JWTs (JSON Web Tokens) pop up. But let’s be real—decoding JWTs by hand or trusting random online tools with your tokens? Not ideal. That’s why I built this JWT Decoder on 1tools.app: so you can instantly decode your tokens, right in your browser, with zero privacy worries.

Here’s how it works: paste your JWT, hit Decode, and you’ll see the header, payload, and signature—each in its own box, formatted for easy reading. Want to copy just the payload for debugging, or the header for a quick check? One click, done. No need to wade through messy output or risk pasting sensitive tokens into unknown sites.

Everything happens locally—your JWT never leaves your device. That means your secrets stay secret, and you stay in control. I made sure the interface is clean, fast, and works great on both desktop and mobile. Whether you’re a developer, a tester, or just curious about what’s inside a JWT, this tool is built for you.

I also added clear error messages, so if your token isn’t valid, you’ll know right away. And because I know how annoying it is to re-copy things, every section has its own Copy button—no more manual highlighting or accidental mistakes.

No sign-ups, no ads, no tracking. Just a straightforward JWT decoder you can trust, whenever you need it. Bookmark this page, and next time you’re working with JWTs—whether for work, study, or just curiosity—you’ll have a reliable, private tool at your fingertips. That’s the 1tools.app way: simple, secure, and always there when you need it.