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Instantly decode and inspect JWT tokens with this app. It's Free and offline.
Decode and inspect JWT tokens offline — with expiry detection and history.
A FREE, offline, privacy-first app to decode and inspect JWT tokens instantly. Usage is very simple: ## Paste a token and see: - The decoded Header, Payload, and Signature, each color-coded for instant readability - Syntax-highlighted JSON with clearly labeled keys and values - Smart claim chips for standard fields — issuer, subject, audience, scopes, roles, and more - Expiry status at a glance — expired tokens are flagged immediately, with a human-readable countdown ("Expires in 3h 22m" or "Expired 2d 14h ago") - Issued-at and not-before timestamps converted to local date and time ## Designed for daily developer use: - Auto-decode on paste — the moment you paste a token, the result appears - One-tap clipboard paste - Built-in sample tokens to explore the UI without needing a real token - History panel that stores your last 30 decoded tokens for quick reference - Tap any history entry to reload and re-inspect it ## Clean, distraction-free interface: - Light and dark mode, with automatic detection based on system preference - Collapsible sections for Header, Payload, and Signature — focus on what matters - Monospace rendering for all token data - Works fully offline — no network access needed, no data ever leaves your device ## Privacy first: JWT Decoder decodes tokens entirely on-device using standard Base64 parsing. Your tokens are never sent to any server. History is stored only in local app storage and can be cleared at any time. ## Perfect for: - Debugging OAuth2 and OpenID Connect flows - Reviewing access tokens and ID tokens - Inspecting claims during API development - Learning how JWTs are structured Simple, fast, private, and built for developers.