Free local HTTP archive tool
HAR Analyzer
Upload a HAR file locally to summarize status codes, blocked requests, redirects, timing, headers, cookies, and Cloudflare error-code hints.
Drop a Chrome, Edge, Safari, or Firefox .har export. Processing stays in this browser.
HTTP status code distribution and error rate
Blocked, failed, and rate-limited request candidates
Redirect chains, slowest requests, and HAR timing phases
Request and response header patterns
Cookie flags, cookie domains, and Cloudflare Ray ID hints
HAR files can contain cookies, tokens, and request URLs. This tool is designed for local review before you share a redacted report.
HAR file debugger
Find request failures before you blame the wrong layer
A HAR file records the browser's network timeline. This analyzer turns that raw HTTP archive into a readable report for access denied pages, slow requests, redirect loops, proxy authentication failures, cookie problems, and Cloudflare-branded responses.
HAR data is parsed in the browser while you use the page.
Large captures are supported without sending raw logs away.
Status groups, redirects, errors, and no-response entries.
Highlights common challenge, access, rate-limit, and 52x hints.
Timing breakdown
Read HAR timing like an operator
Status codes tell you what happened. Timing tells you where it happened. Use both before changing proxies, retry logic, request headers, or monitor delays.
Blocked / queued
Time spent waiting before the browser could start the request. High values often point to browser concurrency, service worker, or proxy pool pressure.
DNS, connect, SSL
Connection setup time. Spikes here can expose DNS issues, proxy latency, TLS handshakes, or regional routing problems.
Waiting (TTFB)
Time until the first response byte. This is where origin slowness, Cloudflare checks, and application-side blocks often show up.
Troubleshooting paths
Connect HAR results to the next fix
Cloudflare access denied responses often map to request profile, location, WAF, or IP reputation problems. Compare HAR findings with our guides to Cloudflare Error 1020, Cloudflare Error 1015, and HTTP 429.
If the HAR shows too much traffic concentration, use the proxy delay calculator to size the pool. If the issue is simply a proxy import problem, clean the list with the proxy formatter.
HAR analyzer FAQ
Answers before you inspect a network log
Is my HAR file uploaded to Unknown Proxies? +
No. The HAR analyzer parses the file in your browser. The upload control is local, and the page does not send your HAR contents to a server.
What can a HAR analyzer diagnose? +
It can summarize status codes, redirects, failed requests, request timing, headers, cookies, cache behavior, and Cloudflare hints such as Ray IDs or common error codes.
Can this find Cloudflare Error 1020 or 1015? +
Yes. If the HAR includes Cloudflare response headers, challenge pages, or page text mentioning errors like 1020 or 1015, the analyzer surfaces those hints.
What should I remove before sharing a HAR? +
HAR files can include cookies, authorization headers, query strings, and request payload metadata. Review and redact sensitive values before sending the file to anyone.
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