Fiddler is a web debugging proxy tool for Windows, macOS and Linux. It has evolved from Fiddler Classic into a more robust and versatile product - Fiddler Everywhere.

Your Fiddler Everywhere app should open automatically. If that doesn't work, click here. Don’t have Fiddler Everywhere?

Feb 26, 2026 · Fiddler is a free web debugging proxy that logs and manipulates HTTP (s) traffic. It supports virtually any application and offers robust tools for performance and security testing.

First, you will go through the installation and configuration steps. Next, you will create a Fiddler account so that you can move on to using the web-debugging tool. Finally, you will see how to capture, …

Fiddler Web Debugger is a serviceable web debugging proxy for logging all HTTP (S) traffic linking your computer to the internet, allowing for traffic inspection, breakpoint setting, and more.

Jun 5, 2019 · Fiddler is a free Web Debugging Proxy which logs all HTTP (S) traffic between your computer and the Internet.

Welcome to the Fiddler Wiki. Thanks for your help in contributing to the Fiddler community. To edit a page, click the Edit button. The Wikidot language is easy to learn.

Want to have Fiddler automatically rewrite requests and responses, add or remove headers, or flag/ignore sessions based on rules you specify? Check out the FiddlerScript Cookbook.

Download and install Fiddler Classic web debugging tool. Watch a quick tutorial to get started.

Your Fiddler Everywhere app should open automatically. If it doesn’t open, Click here. Don’t have Fiddler Everywhere?