What this HAR viewer checks
- Slow requests and total waterfall duration
- Large assets that increase page weight
- 4xx and 5xx HTTP status errors
- Cache and compression opportunities
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Upload your HAR file to analyse network requests, discover performance issues, inspect slow requests, and find optimization opportunities. Everything runs in your browser.
or click to browse • Supports .har and .json files
Identify slow requests, bottlenecks, and timing issues affecting page load.
Automatically find missing compression, cache issues, and error responses.
View waterfall timings, domain analysis, and resource distribution.
A HAR file can include request URLs, headers, cookies, and timing data. This analyzer runs locally in your browser so you can inspect network performance without sending the file to a server.