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.

May 14, 2025 · Fiddler is a free web proxy which supports HTTP and HTTPS traffic while providing a platform for debugging with an array of advanced features and data display. With …

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

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 …

A fiddle is a bowed string musical instrument, most often a violin or a bass. [1] Fiddle is a colloquial term for the violin, used by players in all genres, including classical music. Although …

Fiddler is a web debugging tool that allows you to monitor and modify HTTP and HTTPS traffic between your computer and the internet. It’s an invaluable tool for developers, QA engineers, …

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.

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.

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 …