The free web debugging proxy for any browser, system or platform
Fiddler is a free web debugging proxy which logs all HTTP(s) traffic between your computer and the Internet. Use it to debug traffic from virtually any application that supports a proxy like IE, Chrome, Safari, Firefox, Opera and more.
Easily manipulate and edit web sessions. All you need to do is set a breakpoint to pause the processing of the session and permit alteration of the request/response. You can also compose your own HTTP requests to run through Fiddler.
Debug traffic from PC, Mac or Linux systems and mobile devices. Ensure the proper cookies, headers and cache directives are transferred between the client and server. Supports any framework, including .NET, Java, Ruby, etc.
Use Fiddler for security testing your web applications -- decrypt HTTPS traffic, and display and modify requests using a man-in-the-middle decryption technique. Configure Fiddler to decrypt all traffic, or only specific sessions.
Fiddler lets you see the “total page weight,” HTTP caching and compression at a glance. Isolate performance bottlenecks with rules like “Flag any uncompressed responses larger than 25kb.”
Fiddler web debugging proxy helps you record, inspect and debug traffic from any browser.
Debug web traffic from any Windows-based PC, Mac or Linux system and mobile devices alike.
Fiddler is here to help, no matter what platform or language you use to develop.
Browse through a rich library of useful add-ons for Fiddler built by its founder Eric Lawrence, as well as by third party developers. You can develop your own extensions using the IFiddlerExtension interface.
Fiddler is an excellent tool for understanding the performance of your website, but how does your performance change when lots of users are hitting the site? Check out Telerik Test Studio powered by Fiddler to get an in-depth understanding of how your site performance degrades as the number of users increases.
FiddlerCore is the core proxy engine used by Fiddler to intercept and modify web traffic. You can integrate FiddlerCore into your .NET applications to provide unprecedented functionality.
Need to collect a web capture from an end-user and nervous about pointing them at the full version of Fiddler? Try FiddlerCap, a simple "VCR-like" recorder that generates SAZ captures you can open in Fiddler.
We recently added Fiddler to the Telerik product family. Even more exciting is that brilliant creator of Fiddler, Eric Lawrence, came over from Microsoft to join the team. He will be delivering on his vision for Fiddler with the full backing of Telerik.
The Fiddler community is very important to us. We commit to keeping Fiddler free and expanding its value by further investing into the tool.
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