A free, open-source HAR file viewer that runs entirely in your browser. Drop in ahar file and get instant search, filtering, timing waterfalls, performance insights, and export tools. Handles thousands of requests without breaking a sweat. No servers, no uploads, your data never leaves your machine.
Founder
Screenshots
About
Tired of wrestling with massive HTTP Archive (HAR) files, constantly worrying about uploading sensitive network logs to third-party services? Meet the HAR Viewer, your new essential tool built specifically for developers who value speed, privacy, and control. This isn't just another utility; it's a robust, completely free, and open-source application that lives entirely within your browser. Imagine dropping a multi-thousand request HAR file into the window and getting instant, organized insights without waiting for any server processing or enduring slow load times. That’s the power we put directly into your hands. Because it operates locally, your data integrity is never compromised; what happens on your machine stays on your machine. This means you can confidently analyze performance bottlenecks for sensitive projects without ever needing an internet connection or worrying about data residency policies.
This viewer transforms raw network data into actionable intelligence. Beyond just displaying the request list, we’ve engineered powerful features to help you diagnose issues quickly. Need to find that one specific API call that’s timing out? The instant search and advanced filtering capabilities cut through the noise, letting you pinpoint problematic entries in seconds. Furthermore, the visualization tools are second to none. Explore detailed timing waterfalls that clearly illustrate latency across the entire request lifecycle, helping you understand exactly where time is being spent, from DNS lookup to content download. For those moments when you need to share findings or integrate results into reports, the comprehensive export tools ensure you can easily package the data in usable formats.
What truly sets the HAR Viewer apart is its commitment to performance and accessibility. We understand that network logs can grow enormous, which is why this tool is optimized to handle thousands of requests smoothly, ensuring a fluid user experience even with heavy files. Being open-source means the community constantly vets its security and performance, and you benefit from a tool that is perpetually improving without hidden costs or subscription traps. Whether you are debugging a complex single-page application, optimizing load times for an e-commerce site, or simply learning about web performance fundamentals, the HAR Viewer provides the fast, private, and comprehensive analysis environment you need to build better, faster web experiences.