HAR Analyzer

Use HAR Analyzer tool as a HAR file analyzer and .HAR file viewer to inspect requests, errors, timings and domains locally in Chrome

🔎 HAR Analyzer — inspect HAR files and browser requests locally The HAR Analyzer Chrome extension helps developers, QA engineers and support teams understand a page load or browser flow. Upload a HAR file or capture network activity from the current tab, then review requests, failures, sizes, timings and domains in one side panel. This HAR file analyzer turns a large HTTP Archive into a focused diagnostic workspace. Instead of reading raw JSON, use the requests table, domain breakdown and local summary to find likely problems. The workspace also serves as a HAR report analyzer for a clear developer handoff. 📌 What is a HAR file? A HAR file records browser network activity in structured JSON, including URLs, methods, status codes, resource types, sizes and timings. A HAR viewer makes it easier to investigate slow pages, failed API calls and third-party resources. Use HAR analyzer and the built-in HAR file viewer as a practical HAR file opener and HAR file reader without copying data into an external website. 🚀 Key features ➤ Upload a .har file by drag and drop or file picker ➤ Analyze HAR file requests with a shared normalized view ➤ Inspect method, URL, host, status, type, size and duration ➤ Search requests and filter by status or resource type ➤ Group HAR logs by domain, bytes and failures ➤ Detect slow requests, redirects and large assets ➤ Flag caching issues, duplicates and heavy third-party domains ➤ Generate a copy-ready local brief with affected URLs ➤ Capture available network data from the current Chrome tab 🧩 Two analysis workflows 1️⃣ Open HAR files Drop a valid HAR into the side panel. The .HAR file viewer parses it locally and opens Overview, Requests and Domains, with a copy-ready Brief in Overview. Use this workflow for a customer, teammate or browser DevTools export. 2️⃣ Live page capture Choose Reload & capture for a clean page-load trace, or Start capture to record a flow from the current moment. Finish capture to run the same diagnostics. Live mode creates a partial browser trace; it is not a full HAR export and may not include response bodies or every low-level timing field. 📊 Find issues that matter The HAR analyzer tool narrows a trace to useful evidence: • Failed requests and HTTP error statuses • Slow resources and the slowest completed request • Redirects that add extra network steps • Large scripts, images, fonts or other assets • Static resources with weak caching • Duplicate resource URLs • Heavy third-party domains and transferred bytes This focused HAR file analysis has clear boundaries: - It is not a generic SEO score - It is not a system-wide packet sniffer - It analyzes imported data and information Chrome exposes for the selected tab 📄 Requests, domains and a clear brief Review the result in three steps: 1. Use Requests to view HAR file entries, status, duration and available timings 2. Check Domains for hostname, request count, bytes and failures 3. Expand the Brief in Overview for a local Markdown summary with recommendations and affected URLs 💡 Practical use cases ▸ Investigate a slow or failing page reported by a user ▸ Review API errors and unexpected status codes ▸ Find large resources and third-party network costs ▸ Check redirects, duplicate requests and caching signals ▸ Inspect a checkout, login or other multi-step browser flow Whether you need a HAR log analyzer for support or a Chrome HAR analyzer for current-tab debugging, the interface keeps evidence organized. The same workflow fits a HAR analyser, HAR file analyser or saved HAR trace. 🔒 Local and privacy-conscious processing Uploaded files, available headers and trace data are processed on your device, not uploaded to an analysis server. No account is required. Use HAR Analyzer offline with a saved file; live capture depends on the page being tested. The Brief uses local rules. This version does not send trace data to an external AI service or analyze unavailable response bodies. ❓ Frequently asked questions ❓ How do I open a HAR file? 💡 Open the side panel, then drag in the file or use the file picker. The HAR reader displays normalized results automatically. ❓ Can I analyze the current webpage without exporting a file? 💡 Yes. Start capture for the current tab or reload with capture enabled, then finish the trace to see results. ❓ Is live capture identical to a DevTools HAR export? 💡 No. It is a partial trace built from browser APIs. Some headers, response bodies and low-level timings may be unavailable. ✨ Start analyzing Install HAR analyzer, open a saved HTTP Archive or capture a browser flow, and turn request data into an organized view of failures, timings, resources and domains.