JWT Decoder
Inspect JWT header and payload — no signature verification.
See how it works
Watch a quick simulation of this tool in action — no file needed.
How to use JWT Decoder
Follow these steps — everything happens instantly in your browser.
- 1
Step 1. Paste your JWT (three dot-separated Base64URL parts).
- 2
Step 2. The header and payload are decoded and pretty-printed automatically.
- 3
Step 3. Copy either section or the signature as needed.
- 4
Step 4. Remember: this only decodes — never trust claims without verifying the signature.
Why use this tool
Private by design
All processing happens locally in your browser. Open DevTools → Network and you'll see zero file uploads. Ever.
Instant
No upload wait, no queue, no server round-trip. Results appear the moment you drop a file.
Free & unlimited
No accounts, no watermarks, no daily caps. Use it as many times as you like, forever.
Works everywhere
Desktop, tablet or phone — every tool is responsive and installable as a PWA for offline use.
Frequently asked questions
Everything you might want to know about jwt decoder.
JSON Formatter
Beautify, minify and validate JSON — 100% in your browser.
Base64 Encode / Decode
Convert text to and from Base64 — Unicode-safe, no uploads.
Hash Generator
Compute SHA-1, SHA-256 and SHA-512 hashes — locally.
URL Encode / Decode
Percent-encode or decode URLs and query strings — locally.