HAR File Analyzer
Deep-inspect HTTP Archive (.har) files. Waterfall timeline, request breakdown, domain analysis, performance charts, security audit and more.
Press F12 → Network tab → reload the page
Right-click any request → "Save all as HAR with content"
Drop or select the .har file above to analyze
What is HAR File Analyzer?
A HAR (HTTP Archive) file analyzer is a professional web performance and debugging tool that lets you inspect every network request captured during a browser session. HAR files are JSON-formatted archives exported from browser DevTools, containing detailed timing data, headers, cookies, response bodies, and status codes for each HTTP transaction.
Web developers and performance engineers use HAR analyzers to diagnose slow page loads, trace failed requests, audit security headers, and understand how third-party resources affect load time. By visualizing requests on a waterfall timeline, you can immediately spot bottlenecks — long DNS lookups, slow server response times, render-blocking resources, or unnecessary redirect chains.
This tool parses your uploaded HAR file entirely in the browser and presents a waterfall chart, per-domain breakdown, content-type distribution, and a security audit covering missing headers such as 'Content-Security-Policy', 'X-Frame-Options', and 'Strict-Transport-Security'. You can filter and sort requests by domain, size, duration, or status code to zero in on problem areas quickly. Because all processing is local, your captured traffic data — which may contain authentication tokens or session cookies — never leaves your device.
How to Use HAR File Analyzer
- Export a HAR file from your browser
Open DevTools in Chrome, Firefox or Edge, go to the Network tab, reproduce the issue, then right-click and select "Save all as HAR".
- Upload the HAR file
Drag your .har file onto the drop zone or click to browse. The file is parsed instantly in your browser.
- Explore the waterfall and charts
Review the request waterfall timeline, domain breakdown, content-type distribution, and summary statistics.
- Run the security audit
Check the security tab to see which responses are missing critical HTTP security headers and get remediation guidance.
Key Benefits
See every request plotted on a timeline so you can identify blocking resources and cascading load issues at a glance.
Understand which third-party domains contribute most to page weight and request count.
Automatically flag responses missing essential security headers and receive plain-English remediation tips.
HAR files often contain sensitive tokens. All analysis runs locally in your browser — nothing is sent to a server.
Frequently Asked Questions
A HAR (HTTP Archive) file is a JSON-format log of all network requests made by a browser during a session. It includes URLs, headers, cookies, timing data, and response bodies.
Open DevTools (F12), click the Network tab, reload the page or reproduce your issue, then right-click any request and choose "Save all as HAR with content".
HAR files can contain auth tokens and session cookies. This tool processes everything locally in your browser — no data is transmitted to any external server.
The audit checks for Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy headers.