Is my HAR file uploaded?

No. HAR files often contain cookies and auth headers, so parsing happens entirely in your browser.

How do I create a HAR file?

Open DevTools, go to the Network tab, reload the page, then right-click the request list and choose Save all as HAR.

What does TTFB mean here?

Time to first byte — the HAR 'wait' timing, measuring how long the server took to start responding.

Why do some requests show 0 bytes?

They were served from the browser cache, so no bytes crossed the network.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

HAR File Analyzer

Analyse a HAR export: slow requests, errors, sizes and host breakdowns.

Support

Works Offline

Privacy First

No Login

No API

HAR file

Export from DevTools → Network → Save all as HAR. Parsed entirely in your browser.

Drop a file here

Drop a .har file, or paste its JSON below

Analysis

Load a HAR file to see waterfall stats, slow requests, errors and size breakdowns.

About the HAR File Analyzer

Drop a HAR file exported from Chrome, Firefox or Safari DevTools to see total requests, transferred bytes, page load span, average TTFB, failing and redirecting requests, plus size and timing breakdowns by resource type and host. Everything is parsed locally so private headers and cookies never leave your device.

Examples

Chrome export

network-log.har

Output

142 requests, 3.4 MB transferred, avg TTFB 210 ms

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-16 · Runs entirely in your browser