Fiddler is a Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the internet. Fiddler allows you to inspect traffic, set breakpoints, and "fiddle" with incoming or outgoing data. Fiddler includes a powerful event-based scripting subsystem, and can be extended using any .NET language. It is written by Eric Lawrence, formerly a Program Manager on the Internet Explorer development team at Microsoft.
Fiddler will debug traffic from virtually any application that supports a proxy, including Internet Explorer, Google Chrome, Apple Safari, Mozilla Firefox, Opera, and thousands more. You can also debug traffic from popular devices like Windows Phone, iPod/iPad, and others.
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. 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".
Ensure the proper cookies, headers and cache directives are transferred between the client and server. Supports any framework, including .NET, Java, Ruby. 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.
For web traffic capture only you can download Telerik FiddlerCap. Usually, this action is performed to track down a bug in your web browser or a website.
- Web Debugging
- Performance Testing
- HTTP/HTTPS Traffic Recording
- Web Session Manipulation
- Security Testing
- Customizing Fiddler
Download Fiddler Free
Download for .NET Framework 4
Download for .NET Framework 2
Note: Fiddler requires to Download .NET Framework 4+.
Last Update: August 20, 2017
4.6.20172.34691 (.NET 4) / 18.104.22.168 (.NET 2)
Languages: Multiple Languages
Supported Operating Systems:
Windows XP / Vista / 7 / 8 / 8.1 / 10 (32-Bit, 64-Bit)