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HomeHAR File Analyzer

HAR File Analyzer

Understand what's slowing down a page load. Drop a HAR file exported from your browser's Network tab and get an instant breakdown: total requests, transferred size, and time, plus grouping by HTTP status, resource type, and domain, and the slowest and largest requests. Because HAR files can contain sensitive headers and cookies, everything is analyzed in your browser and never uploaded.

100% client-side · no data leaves your browser

How to analyze a HAR file

Read a HAR file and find slow and heavy requests.

  1. 1

    Export a HAR

    In your browser DevTools, open the Network tab, reload the page, then right-click and Save all as HAR.

  2. 2

    Drop the file

    Drop the .har file into the tool. It's parsed instantly in your browser.

  3. 3

    Review

    Read the totals and breakdowns to find the slowest and largest requests.