MEASURE · INSPECT · COMPARE
HAR Analyzer — Inspect & Compare Network Requests
Use this free HAR file analyzer to inspect requests, timings and data coverage. Compare two recordings without an account or email.
Your local files stay in this browser. File-link import connects to the source. Webpage recording uses our server and is available only for configured public domains.
Choose a recording
Recording A · Before
Drop a HAR file here
Up to 25 MiB, 20,000 requests and 200 pages per recording. Only supported HAR JSON is accepted.
Parsed in a Web Worker on your device. The file is not uploaded and its requests are never replayed.
Your recording, explained
Add a HAR file or try the labelled synthetic demo. The report will appear here; no requests from an imported file will be executed.
How to use a HAR recording
Export a recording from Chrome
Open DevTools → Network, clear the log and reload the page. Stop recording when the scenario is complete, then export HAR using the sanitized option when available. Avoid including authenticated sessions, secrets or unnecessary content. Check the file before sharing it.
What this analyzer does not measure
HAR alone does not provide reliable LCP, INP, CLS, unused CSS/JavaScript, rendering impact or SEO outcomes. Findings are checks to investigate, not guaranteed causes, savings or a performance score. Consent screens and anti-bot pages may be the recorded content; automatic detection is incomplete.
Make comparisons meaningful
Use the same page, scenario, viewport, browser and cache/network settings. Two single recordings are not a controlled experiment. Capture conditions missing from imported files stay unknown.
Privacy and limits
The analyzer does not replay HAR requests, store raw files or send recordings to AI. Local processing is limited to this page’s Worker memory; clearing or closing the page removes its references, not a guaranteed forensic erasure. Server URL recording is separately labelled and follows this deployment’s access policy. Automatic redaction cannot guarantee anonymity.
Need help investigating the result?
Explore our web performance service. Your recording is not attached to a request automatically.