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📊 HAR Analyzer

Analyze HTTP Archive files — waterfall chart, request statistics, errors

📂

Drop .har file here or

Your file never leaves the browser

RequestsTotal HTTP request count and resource type breakdown.
SizeTotal page weight: JS, CSS, images, fonts, API.
ErrorsAll requests with 4xx/5xx status: broken resources, missing files.
WaterfallVisual loading diagram: DNS, SSL, TTFB, download.

Common Mistakes

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Not using HAR for debuggingHAR file contains the full page load picture, including timings and headers.
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Ignoring cached resourcesCached requests show 0 ms — this does not mean the resource is fast.
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Not checking third-party resourcesAnalytics, ads and widget scripts often slow down page loading.

Frequently Asked Questions

What is a HAR file?

HAR (HTTP Archive) is a standard format for recording all HTTP requests and responses when loading a web page. The file contains URLs, headers, timings, sizes, and response codes for each resource.

How to export HAR from Chrome?

Open DevTools (F12) → Network tab → load the page → right-click → Save all as HAR with content. The file will be saved with a .har extension.

Is it safe to upload a HAR file?

Completely safe — the file is processed entirely in your browser via JavaScript. Data is NOT sent to the server and never leaves your computer.

What does the waterfall chart show?

The waterfall chart visualizes the order and timing of each resource load. Bar colors represent phases: DNS lookup, TCP connection, SSL handshake, TTFB wait, and data download.

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