Web and HTTP Debugging and Troubleshooting Made Simple

Uncover software bugs when HTTP communication is involved. The Fiddler set of tools helps you promptly identify errors to effectively fix them. Easily.

Which Fiddler Do You Need?

Choose based on platform support, debugging workflow, and feature set.

Enterprise-ready debugging and testing for MacOS, Windows, and Linux 

Automated traffic analysis for faster bug diagnosis in collaborative and agent-assisted workflows for developer and QA teams
MCP integration for coding assistants to analyze captured requests and responses
Real API traffic capture and inspection across endpoints, headers, payloads, status codes, and responses
Supports protocols such as HTTP(S), HTTP/2, WebSocket, and gRPC
Multi-step traffic filtering, rules, request composition, and collaboration features
Product updates and dedicated support

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* Fiddler Everywhere Reporter is part of Fiddler Everywhere for capturing and sharing web traffic logs for troubleshooting. No installation, login, or license required.

Manually inspect network traffic to diagnose issues for Windows

Debugging and traffic inspection for hobbyists, students, and developers
Legacy network debugging tool for individual debugging workflows
Basic composer support for quick API calls and request edits
Decoding and inspection of HTTP(S) requests and WebSocket communication
Single-user traffic filtering and request composition features
Maintenance mode with community support

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Embeddable .NET library

Teams building commercial tools with embedded traffic capture
.NET library for HTTP and HTTPS traffic capture and modification
Detection of delays, missing services, and threats
Standard support

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How to Start Your Fiddler Journey

1 Try the Fiddler product(s) and the web debugger that aligns with your needs.

2 Integrate Fiddler into your workflow for rapid, elegant debugging and troubleshooting.

3 You’ll start realizing the high value of benefits of Fiddler through the acceleration of both your time and cost savings.

Hundreds of Thousands of Organizations
are Using Fiddler

Join these companies and the 4 million developers who are already building, running, and debugging with Fiddler proxy tools.

4.4 Out of 5 Overall User Rating

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.

Support & Learning

Blog

How to Select the Right Fiddler Tool for You

Resource

Fiddler Everywhere – Licensing and Purchasing FAQs

Resource

Fiddler Everywhere - Getting Started

How Can We Help? We'd Love to Hear from You!

Frequently Asked Questions

What is a web debugging proxy?

A web debugging proxy is a tool that sits between a client app (such as a browser or mobile app) and a web server to intercept, inspect, and modify the traffic exchanged between them. This allows developers and QA professionals to analyze the requests sent from the client and the responses received from the server, helping them identify issues such as errors, performance bottlenecks, security vulnerabilities, or incorrect data. By using a web debugging proxy, users can diagnose and troubleshoot problems in applications, APIs, and services more effectively. Fiddler Everywhere is a powerful web debugging proxy to facilitate your debugging efforts and optimize your processes.
Can I capture traffic from remote devices with Fiddler Everywhere?

Yes, you can use Fiddler Everywhere remotely to capture and analyze network traffic from basically any device (like a computer, console, smartphone, smart TV, and other smart devices) on the same network as the Fiddler Everywhere host machine. You can do this with the Remote Device Capturing feature and configure a remote device, which will allow you to monitor and debug traffic from the remote device.
What support options does Fiddler Everywhere cover?
Fiddler Everywhere offers a range of support options, including:
- Comprehensive documentation with detailed guides, tutorials and references to assist the users in their journey to understand and utilize the tool effectively;
- Community forums where users can ask questions or share tips with fellow fiddlers;
- Dedicated support by the Fiddler team when experiencing issues or in need of guidance on advanced usage;
- Ongoing updates and improvements to ensure that Fiddler Everywhere remains current with new features and bug fixes;
- A topic-rich blog to explore.
Thus, ensuring that users have the resources they need to effectively use the tool and resolve any issues that may arise.

Can Fiddler Everywhere be used with mobile devices?

Yes, Fiddler Everywhere can be used with mobile devices. By configuring your mobile device to route its network traffic through the machine running Fiddler Everywhere, you can capture and analyze HTTP/HTTPS traffic from mobile apps and browsers. This setup allows you to debug and monitor network requests and responses from your mobile device, making it a valuable tool to ensure that all communications run correctly.
What does the Fiddler Everywhere trial include?

The trial period allows users to fully explore Fiddler Everywhere’s capabilities before deciding on a subscription. During a period of 10 days, customers can access all the features of the paid version, including enterprise-level capabilities, allowing them to fully explore how the product integrates with their company workflows. Once the trial period expires, users can easily upgrade to a monthly or annual subscription plan, according to their needs.
Can I use Fiddler Everywhere without internet?

Yes, you can use Fiddler Everywhere without an active internet connection. The core functionality of capturing and analyzing local network traffic will work offline, however, be aware that you might experience some limitations regarding certain features that rely on internet access. If you’d like to discuss a particular use case, please contact us at fiddler@progress.com.

A Trial of Any of the Fiddler Products Gives You:

A fully functional version of the software.
Strict data privacy protection. Your data remains with you, it will never be shared.
Easy upgrade path to a licensed product.
Full access to all online documentation, community forums and tutorials.

Web and HTTP Debugging and Troubleshooting Made Simple

Which Fiddler Do You Need?

How to Start Your Fiddler Journey

Hundreds of Thousands of Organizations are Using Fiddler

4.4 Out of 5 Overall User Rating

Support & Learning

Frequently Asked Questions

A Trial of Any of the Fiddler Products Gives You:​​

Hundreds of Thousands of Organizations
are Using Fiddler

A Trial of Any of the Fiddler Products Gives You: