Network Tools
HAR File Analyzer & Waterfall
Drop a .har capture and get a request waterfall, reconstructed Core Web Vitals, a performance findings list and a privacy-redacted export. Nothing is uploaded — the file never leaves your browser.
Drop a .har file here
Parsed in a background thread, so even a 100 MB capture will not freeze the tab.
Choose a file100% client-side — no upload, no server, no telemetry.
How to capture a HAR
Chrome / Edge
- Open DevTools → Network
- Tick Preserve log, reload the page
- Click the ⭳ export icon → Export HAR
Firefox
- Open DevTools → Network
- Reload the page
- Right-click any row → Save All As HAR
Safari
- Enable the Develop menu in Settings → Advanced
- Web Inspector → Network, reload
- Click Export in the toolbar
A HAR records every request your browser made, including cookies and auth headers. Use the redaction export below before sharing one with anybody.