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Analyze browser HAR files — sizes, timings, and slowest requests.
Upload a .har file exported from your browser DevTools Network tab and instantly see a breakdown of every request: status, type, size, and timing. Get summary stats — total requests, transferred bytes, load time — spot the slowest calls, and see third-party domains at a glance. Everything is analyzed locally in your browser; nothing is uploaded.
HAR File Analyzer provides a fast, client-side breakdown of browser network traffic exported from Developer Tools. By performing all parsing locally within the browser, it ensures sensitive network data remains private without requiring external uploads or software installation. It delivers immediate visibility into request timings, sizes, and slow-loading assets.
Good to know: Extremely large HAR files with thousands of requests may push browser memory limits during local parsing, requiring specialized desktop tools for enterprise-scale performance analysis.
Quickly analyze browser network logs to identify performance bottlenecks and request details without uploading data.
Export a HAR file from your browser
Open your browser DevTools Network tab and click the export or save icon to download your session as a .har file.
Upload the file to the analyzer
Drag and drop your .har file into the tool or use the file picker to select it for local processing.
Review the summary performance statistics
Check the high-level metrics including total requests, total transferred bytes, and overall page load time.
Analyze individual request timings and sizes
Scroll through the breakdown to see status codes, file types, and specific timing data for every network call.
Identify slow requests and third-party domains
Use the analysis to spot the slowest requests and see which external domains are impacting your site performance.
Estimated time: PT1M
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