HAR File Viewer & Analyzer
Open a .har file to see every request, status, size, timing and a waterfall — 100% in your browser.
About HAR File Viewer & Analyzer
Open a HAR (HTTP Archive) file exported from your browser's DevTools Network tab and see every request in a sortable table: name, method, status, type, transferred size and time, plus a simple waterfall showing when each request happened. A summary gives the total request count, bytes transferred and overall time.
HAR files can contain sensitive data (cookies, tokens, request bodies), so it matters that this runs entirely in your browser — nothing is uploaded. It's handy for debugging performance and sharing a load breakdown.
What you get
Open example.har
42 requests · 1.8 MB transferred · 3200 ms · per-request waterfall
Export a .har from DevTools → Network → right-click → Save all as HAR.
Frequently asked questions
What is a HAR file?
A HAR (HTTP Archive) is a JSON file that records all the network requests a page made — you can export one from your browser's DevTools Network panel.
Is my HAR uploaded anywhere?
No. It's parsed entirely in your browser. That's important because HAR files often contain cookies, auth headers and request bodies.
What does the waterfall show?
Each request's start time and duration relative to the whole capture, so you can see what ran when and spot slow or blocking requests.
Can I paste HAR JSON instead of a file?
Yes. Paste the JSON directly, or open a .har file — both work.