HAR File Analyzer LOCAL ONLY

Inspect a browser HAR capture for slow requests, transfer size, failing responses, cache metadata, and host-level timing without uploading the file.

HAR files can contain URLs, headers, cookies, and response metadata. The file is read and analyzed only in your browser.
HAR JSON input

Supports standard HAR files with log.entries. The tool summarizes the capture and does not replay any request.

Capture summary
Slowest requests
Load a HAR file to see the slowest requests.
Host totals
Load a HAR file to see host-level totals.
Review notes
  • Load a valid HAR file or paste its JSON contents.

Find performance signals in an existing capture

The analyzer does not make any network request. Timing values reflect the HAR export, so use it as a review aid alongside browser performance and backend observability data.

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