The Original and Free Web Debugging Proxy Tool Exclusively for Windows
The community-trusted free Windows-only tool that logs HTTP(s) network traffic.
*Please be aware that Fiddler Classic is not in active development and offers no commitments for releases, patches or tech support. By using this product, you assume all associated risks. We recommend upgrading to Fiddler Everywhere.
Your Big Wins Using Fiddler Classic
Satisfy Criteria
You have immense expectations in your role, and between experimental programming languages, security vulnerabilities, and coding errors, you need to be able to quickly get to the root cause of traffic and network problems.
Achieve Savings
Meeting these expectations without the proper tooling costs your company money and opportunities. Visualize how powerful you can become by spending less time searching for network errors and more time on useful things more aligned with your passion.
Make a Difference
Be the difference-maker in your role. Let Fiddler Classic give you and your team precious time back to deliver stable software by finding and resolving bugs/defects with speed and elegance.
*Please be aware that Fiddler Classic is not in active development and offers no commitments for releases, patches or tech support. By using this product, you assume all associated risks. We recommend upgrading to Fiddler Everywhere.
What Can I Do With Fiddler Classic?
Inspector in Fiddler Classic
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Skillfully Inspect HTTP/HTTPS Traffic
Use Fiddler Classic to inspect HTTP/HTTPS traffic to and from browsers and desktop apps. The Traffic Inspector allows you to dive into the details of any specific network request.
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Artfully Create HTTP(S) Requests
You can access everything you need to create a new request from the API Composer tab. Communicate with the web server with precision, thus calling only the resources you want.
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Masterfully Mock or Modify Requests
Mock services and help with testing behaviors triggered by responses from external providers. Use the AutoResponder to create mock responses and get closer to testing complete.
*Please be aware that Fiddler Classic is not in active development and offers no commitments for releases, patches or tech support. By using this product, you assume all associated risks. We recommend upgrading to Fiddler Everywhere.
Hundreds of Thousands of Organizations Use Fiddler
Join these companies and the four million developers who are already building, running and debugging
with Fiddler.
Looking to Get to Done Faster? Check out Fiddler Everywhere.
Try Fiddler Everywhere for Free, Then $12 a Month, Cancel Anytime.
Fiddler Everywhere works across all platforms equally well—macOS, Linux, and Windows—and gives you supercharged inspecting, debugging, and mocking features. And you can now enjoy the offline functionality.
Why Go with Fiddler Everywhere?
G2.com User Reviews
Fiddler is used by tens of thousands of Users daily and they love it! Don’t just take our word for it. G2 Users have consistently rated Fiddler 4.4 out of 5 stars. G2 is a renowned peer-to-peer review site that aggregates user reviews for business software.
Users of G2.com provide unbiased user reviews after they objectively access business software.
Support and Learning
