Inspect .har files in your browser — timings, headers, payloads, waterfall. Nothing is uploaded.
A HAR (HTTP Archive) file is a standardized JSON log that records every network request a browser makes while loading a web page or performing actions. It captures:
Developers, QA engineers, and performance analysts export HAR files from browser DevTools to diagnose slow pages, failed API calls, CORS problems, authentication issues, and third-party script overhead. Because HAR files can contain sensitive data (tokens, cookies, form data), it is best to inspect them locally — which is exactly what this free online HAR viewer does.
Open DevTools → Network tab → reproduce the issue → right-click the request list → “Save all as HAR with content”.
Drag the file onto the drop zone above, or click to browse. The file is read entirely in your browser — nothing is uploaded.
See a visual waterfall of the first requests, then browse the full table. Filter by URL, method, status, or resource type.
Click a row to open headers, query parameters, request payload, response body, and timing breakdown on the right panel.
DevTools (F12) → Network → reload or perform actions → right-click request table → Save all as HAR with content.
DevTools (F12) → Network → perform actions → gear icon or right-click → Save All As HAR.
Enable Develop menu → Develop → Show Web Inspector → Network → right-click → Export HAR.
Charles Proxy, Fiddler, mitmproxy, and many CI tools can also export standard HAR 1.2 files that work here.
All parsing happens in your browser. Your HAR never touches a server.
Visual timeline of request start and duration so you can spot blocking resources instantly.
Filter by URL, HTTP method, status code, resource type, or show only errors.
Headers, query strings, payloads, response bodies, and timing phases in one place.
Open the page and start inspecting. No accounts, no limits, no tracking of your files.
Works with HAR files from Chrome, Firefox, Safari, Edge, and standard proxy tools.
Browser DevTools are great for live inspection, but once you close the tab the capture is gone. Exporting a HAR lets you:
Most online HAR viewers upload your file to a server. This one does not — making it ideal when the capture contains authentication tokens, personal data, or internal API details.