Fiddler Everywhere is a modern, easy-to-use web debugging proxy for macOS, Windows, and Linux. Your trusted debugging tool for testing end-to-end behavior.
In addition to the System proxy that captures all network traffic on your computer, and the Browser option that opens a clean browser instance, you can also capture traffic by triggering a Terminal process.
Specify the filter criteria to see captured sessions and save the filters with the power to re-use them each time you search for specific results.
Capture HTTP(S), including HTTP/2, WebSocket, gRPC traffic and connections that support TLS 1.3 on Windows, macOS, and Linux right out of the box with Fiddler Everywhere.
Fiddler Everywhere's API Composer makes it easy to quickly compose, test, group, and organize your API requests. You can make a new request from scratch or edit a request already captured by Fiddler Everywhere.
Your power tool for mocking server responses, modifying traffic and simulating real-life scenarios. Create Rules based on your preferred conditions and organize them into Groups for easier workflow.
Debug traffic from macOS, Windows, or Linux systems and iOS or Android mobile devices. Ensure cookies, headers and cache directives are transferred between the client and server.
Mock or modify requests and responses from any app. It is an uncomplicated way to change the request and responses to test any app without changing the code.
Use Fiddler Everywhere to log all HTTP/S traffic between your computer and the Internet, including HTTP/2, gRPC and WebSocket communication. Debug traffic from any app that supports a proxy.
Collaborate with your team by sharing captured traffic with the click of a button. Accurately add comments and safely share them with your colleagues. Designed to be secure.
Enjoy seamless access and a variety of features which Fiddler Everywhere's offline mode allows, with limited or no internet connection.
Expertly capture, debug, inspect, and modify mobile traffic with ease in a few simple steps! Utilize a single proxy setup on macOS, Linux, Windows, Android, and iOS.
With Fiddler Everywhere you can capture, inspect, alter, and replay network traffic - on any browser, any device, and any platform.
Test new features and legacy code by inspecting network traffic and composing rules to diagnose potential problem scenarios, before they occur in production.
Use Fiddler Everywhere to quickly inspect and diagnose customer issues faster than ever before.
We use Fiddler as a proxy in our development process. We're able to save countless hours by running code locally instead of publishing changes. This makes it very easy to test and confirm code changes work properly before pushing anything to production.
Fiddler made it easy for us to work on different projects set up in different environments. Fiddler enables us to work on all projects simultaneously with very minimal settings needed for each project. It not only increases our productivity (users need to learn less applications) but also reduces costs (reduces the number of applications needed to buy).
I appreciate Progress Telerik Fiddler's intuitive interface and robust web debugging capabilities, providing seamless navigation and invaluable insights into HTTP traffic for optimal application performance.
Best Proxy Server Tool I have used. For web developers, it is one of the advanced tools with the simplest UI in the business. Easy to use. Lots of features.
It's so simple to use, really easy to filter out requests to only see the bits that you are actually interested in. It's such a useful and well-built project that I insist all developers on my team have it so that they can use it for debugging and to aid in building new integrations. Invaluable tool. Cannot recommend it enough.
There’s a Fiddler Product for Every Need
Original Fiddler Web Debugger tool — feature rich, functional and supported only on Windows.
Reliable and powerful .NET library allowing you to capture and modify HTTP and HTTPS traffic.
A lightweight companion tool to capture web traffic from end-users or from customer environments.
A unified troubleshooting browser extension solution for support teams to report and fix bugs.