Fiddler is a web debugging proxy which logs/capture 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 Web Debugger 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.
Fiddler is available in two main editions: Classic, and Everywhere. Everywhere include all features of the original Fiddler (Classic), plus secure collaborative troubleshooting baked-in and new modern user interface. Not to mention it's adds support for macOS, and Linux too!
Fiddler Everywhere is offered in two editions: Free, and Pro. Fiddler Everywhere Pro adds extended sharing and collaboration options upon the Free edition, such as unlimited auto responder rules, create unlimited saved sessions entries, can save up to 1000 sessions, up to 50MB shared session size, and email support.
- Web Debugging
- Performance Testing
- HTTP &HTTPS Traffic Recording
- Share captured traffic with collaborators
- Decrypt secure traffic (HTTPS)
- Web Session Manipulation
- Security Testing
- Customizing Fiddler
- Compose API requests
Download Fiddler Everywhere
Download for Windows
Download for Mac OS X
Download Fiddler Classic Edition
Download for Windows
Note: Fiddler 5 requires to Download .NET Framework 4+.
Last Update: April 14, 2020
Languages: Multiple Languages
Supported Operating Systems:
Windows XP / Vista / 7 / 8 / 8.1 / 10 (32-Bit, 64-Bit)
Mac OS X 10.9 or later