HAR File Analyzer

Load a HAR file or paste its JSON to review requests and host summaries. Timings and sizes come from the capture, not a new performance test.

Runs locally in your browser

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.