HAR File Analyzer
Analyze HAR network captures — waterfall timing, payload sizes, failed requests. Find the 3-second render blocker in minutes — local parsing, free, no signup.
How to Use the HAR File Analyzer
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Frequently Asked Questions
How do I find slow requests?
Sort by time: DNS, connect, TTFB, and content-download phases split per request. One 3-second font or API call usually dominates — optimize that first.
What about failed requests?
4xx/5xx entries list with URLs and bodies where captured. CORS failures show as opaque — check the console alongside.
Share HARs safely?
Scrub first: HARs contain cookies, tokens, and POST bodies. Sanitize or share with trusted parties only — the analyzer itself uploads nothing.
Is capture data uploaded?
No — parsing runs locally in your browser. HAR contents never leave your device — still sanitize before sharing exports.
How are timing, sizes, and the waterfall computed?
Total time per entry sums wait + receive only; body sizes of -1/unknown count as 0 bytes and are listed under Skipped/approximated; the text waterfall draws 1 # per 20ms capped at 30 characters, with URLs cut to 40 characters.
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Last updated October 2026