by Telerik

Easily edit and manipulate web sessions

Operating system: Windows

Publisher: Telerik

Release: Fiddler 5.0.20182.28034

Antivirus check: passed

Last revision: Last week

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Fiddler lets you inspect traffic, set a breakpoint, and 'fiddle' with any incoming or outgoing data. Fiddler includes a robust event-based scripting system that can be extended using any .NET Framework language. 

Easily edit web sessions: simply set a breakpoint to pause processing of the session and then authorize alteration of the response/request.  You can compose your own HTTP requests and then run them via Fiddler.

Fiddler allows you to see the “total page weight.” Also, it lets you see HTTP compression and caching at a glance. In fact, you can isolate performance bottlenecks with simple rules such as “Flag any uncompressed responses larger than 35kb.”

Fiddler decrypts HTTPS traffic and displays and modifies web application requests using "man-in-the-middle" decryption techniques. You can configure Fiddler to decrypt all traffic or only specific sessions that you need. Benefit from rich extensibility modeling, that ranges from simple FiddlerScript to very powerful extensions that can be developed using a .NET Framework language.

Fiddler ensures that proper headers, cookies, and cache directives are transferred between clients and the server.

Fiddler (for Windows) is a free Web Debugging Proxy that logs all HTTP(S) traffic between the Internet and your computer.

  • Customizable Free Software Tool
  • HTTP/HTTPS Traffic Recording
  • List of ready-made add-ons
  • Performance Testing
  • Security Testing
  • Set Break-points
  • Web Session Manipulation
  • Web Debugging

Fiddler is freeware that can debug Internet traffic from virtually any application device that supports a proxy.

System Requirements:

  • Disk Space: 8MB
  • Framework: Fiddler2 requires .NET v2, Fiddler4 requires .NET v4
  • Memory: 2 GB+ recommended
  • Processor: 1GHz
  • Supported Operating Systems: (Windows XP/Vista/7/8/10)
John Ketchell
I hate having to debug faulty software. It is extremely time-consuming and annoying. I feel the Fiddler software product helps streamline the process and make it a lot easier to understand and perform. This was amazing really and ultimately a product that stands out as unique and fitting a niche.
Fiddler is a proxy server that works on Hypertext Transfer Protocol and is used as debugging application. It is used to trace or log all the HTTP traffic between the internet and the System and used to inspect the traffic. It's mainly used for web debugging.
Ben Torrez
This won't be for everyone, as it is designed to fit a specific demographic. There is the ability to track cookies, and make sure those cookies are being transferred correctly. The program also allows the user to adapt the program in order to best fit their needs. No matter what type of business you have, this product will make you able to accomplish your needs. Including performance testing and traffic recording, there's a wide range of capabilities to meet business needs.
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