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.

Fiddler Everywhere is a high-performance, cross-platform web debugging proxy for any browser, system or platform. It is a web debugging tool that logs all HTTP (S) traffic between your computer …

Fiddler’s advanced analysis tools enable users to inspect headers, payloads, and timing information for individual requests, facilitating in-depth troubleshooting and performance optimization.

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.

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.

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

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

Welcome to the GitHub repo for Fiddler Documentation. This repository contains the source content--written in Markdown--that we use to power the Fiddler Classic Documentation at …