JWT Decoder — by BitTools
Decode JWT header and payload safely. 100% client-side.
How to use
- Paste your JWT into the left input box.
- Click Decode to view header and payload as formatted JSON.
- Copy the output if needed.
About This Online JWT Decoder
This free online JWT Decoder is a free online tool that lets you instantly decode and verify JSON Web Tokens (JWTs). It breaks down a token into its three parts — header, payload, and signature — and displays them in a readable format. Since the decoding happens entirely in your browser, your token data remains secure and private. This makes it useful for developers working with authentication, APIs, or debugging token-related issues.
All validation is performed directly in your browser. That means your data never leaves your device — making this JWT decoder tool 100% secure and private.
👉 Read More JWT Decoder Guide by BitTools.cc
About JWT Decoder
A JWT (JSON Web Token) is a compact, URL-safe way of securely transmitting information between parties. JWTs are widely used in authentication systems and APIs. A typical token contains three parts — header, payload, and signature — encoded in Base64URL format.
Using a JWT Decoder makes it easy to decode and inspect these tokens. Developers often need to debug tokens, view claims in the payload, or verify whether the token was signed correctly.
Why Use a JWT Decoder?
- 📌 Decode JWT — instantly view the header, payload, and signature.
- 📌 Debug Authentication — inspect token data during login and API calls.
- 📌 Verify Claims — check expiration, issuer, audience, and custom claims.
- 📌 Stay Secure — decoding happens fully in your browser; no data is uploaded.
Frequently Asked Questions
🔹 What is a JWT?
A JSON Web Token (JWT) is a standard for securely transmitting claims between parties. It is commonly used in authentication and authorization flows.
🔹 Is this JWT Decoder safe to use?
Yes. This tool runs entirely in your browser, ensuring that no JWT data is sent to any server. Your tokens remain private and secure.
🔹 Can I modify or create JWTs here?
This tool is primarily for decoding and inspecting tokens. Some advanced versions may allow you to encode or sign JWTs with a secret for testing purposes.
🔹 What other developer tools are available?
BitTools provides a range of free developer tools. Keep an eye on our homepage for updates and new utilities.
About BitTools
This JWT Decoder is part of BitTools.cc — a free collection of online utilities for developers, security testers, and learners. No tracking, no uploads — just fast, browser-based tools.