How do I use the jwt decoder / encoder?

Decode, inspect, verify and encode JWT with HS256 or RS256. Explain claims in plain language. All in your browser – no data sent to servers. Simply visit the tool page and start using it immediately. No registration or installation required.

Is jwt decoder / encoder free to use?

Yes, all our tools are completely free to use. No hidden fees or premium features.

Do I need to create an account to use jwt decoder / encoder?

No account creation is required. All tools work directly in your browser without any setup.

Does jwt decoder / encoder work on mobile devices?

Yes, all our tools are fully responsive and optimized for mobile devices. They work seamlessly on desktop, tablet, and mobile browsers.

JWT Decoder / Encoder

Paste any JWT to decode header and payload, see claim explanations, and verify (HS256 or RS256) or encode tokens. All processing happens in your browser – nothing is sent to a server.

🔐 JWT Token

📄 Header (JSON)

🧾 Payload (JSON)

🔑 Signing key

Algorithm

Decode & Inspect

View token header & payload with syntax-highlighted JSON and claim expiry countdown – perfect for quick debugging.

Encode & Sign

Build a header & payload, supply a secret, and generate a HS256-signed JWT in one click.

Verify Signature

Confirm a token's integrity by validating its signature against your secret key – get instant pass/fail feedback.

Why use this JWT tool?

Client-side only: All encoding/decoding happens in your browser – your tokens and secrets never leave your device.
Live expiry countdown: See how long until a token expires based on the exp claim (if present).
Instant validation: Invalid structure or malformed Base64 parts are detected and surfaced immediately.
Copy & share: Quick copy buttons on every section let you share tokens or JSON fragments with teammates.
Optional save in browser: Your last token and decoded header/payload are saved in your browser and restored when you return.
Open-source & auditable: Explore the code on GitHub and verify there's no hidden network requests.

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Added Jul 5, 2025

🔄 Workflow Suggestion

Try combining multiple tools for a complete workflow. For example: Notepad → Text Encryption → Save to Cloud or Date Calculator → Calendar → Countdown Timer

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