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Анализатор производительности файлов HAR

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Автоматический процесс

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Клиентская сторона

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Анализатор производительности файлов HAR

Upload or paste an HTTP Archive (HAR) file and instantly get a performance breakdown of every request the browser made: total transfer size, request count, slowest endpoints, biggest payloads, status code distribution and per-domain timing. Everything is parsed client-side in your browser — your HAR file never leaves the page.

Как использовать

Open Chrome DevTools, switch to the Network tab, reload the page, then right-click any row and choose “Save all as HAR with content”.
Drop the .har file into the uploader, or paste the JSON into the text area.
Use the type, status and Top N filters to focus on JavaScript, XHR, errors, or any other slice.
Inspect the summary, status distribution, per-type and per-domain tables, then jump to the slowest and largest requests to find optimization targets.
Click “Download CSV” to export the full analysis report for a Jira ticket, a Slack thread or your performance budget tracker.

Возможности

Aggregate summary – Total requests, unique domains, transfer and content size, page span, average / median / p90 timing and average TTFB.
Status code distribution – 2xx / 3xx / 4xx / 5xx / failed counts at a glance so you can spot broken assets quickly.
Performance by content type – Compare JavaScript, CSS, images, fonts, XHR, media and HTML side by side with totals and averages.
Top domains – See which third-party hosts dominate request count, bytes transferred and total time.
Slowest requests – Ranked by total time with method, status, type, TTFB and size — perfect for picking optimization targets.
Largest requests – Ranked by transfer size with content size and time, ideal for hunting bandwidth hogs.
Фильтры – Drill into a single content type or status tier without losing the rest of the dataset.
Экспорт в CSV – Download a single CSV containing the full breakdown for sharing or further analysis.
Приватность на первом месте – HAR parsing happens 100% in the browser; nothing is uploaded to a server.

 Часто задаваемые вопросы

Что такое файл HAR?

A HAR (HTTP Archive) file is a JSON-formatted log of a browser session's network activity, defined by the W3C Web Performance Working Group. It records every HTTP request and response — including URL, method, status, headers, timings and payload sizes — and is the standard interchange format between Chrome, Firefox, Safari and Edge devtools.
What does Time to First Byte (TTFB) measure?

TTFB is the elapsed time between the browser sending an HTTP request and receiving the first byte of the response. It includes DNS lookup, TCP connection, TLS handshake, server processing and network latency. High TTFB usually points at server-side bottlenecks rather than client-side rendering issues.
Why use p90 instead of average for latency?

Averages hide tail latency: a few slow requests can be drowned out by many fast ones. The 90th percentile (p90) reports the value below which 90% of requests fall, surfacing the experience of users on slower connections or further from your servers — a more honest reflection of perceived performance.
What is the difference between transfer size and content size?

Transfer size is the number of bytes that travelled over the wire, including response headers and any compression encoding such as gzip or Brotli. Content size is the decompressed payload as the browser sees it. Comparing the two reveals how effective your compression strategy is.