The free web debugging proxy for any browser, system or platform
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.
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 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.
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.
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.
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.
Leverage Fiddler and the Geoedge global proxy network to monitor, inspect and debug traffic from over 130 locations. You can access Geoedge’s servers directly within the familiar Fiddler environment and easily switch from one location to another. With Geoedge you get access to:
More about Geoedge global proxy network
Integrate FiddlerCore into your application. 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.
The FiddlerScript Editor is a text editor that helps you edit script rules for Fiddler. It offers syntax highlighting and a class explorer to help you author scripts.
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.
In 2012, we added Fiddler to the Telerik product family. Even more exciting is that the creator of Fiddler, Eric Lawrence, came over from Microsoft to join the team. He's now 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.