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How do I create a HAR file?

Modified on: Thu, 23 Apr, 2026 at 4:00 PM

 Note: HAR files can contain sensitive data, including the content of the pages you downloaded when creating the file and your cookie data. Anyone with the HAR file can emulate your account and has access to the information submitted (e.g. personal details, passwords, credit card numbers, etc.).

What is a HAR file?

HAR is an abbreviation of 'HTTP Archive'. It is a file containing a log of trace information from within a browser session.

It records web requests made by the browser to the website page including request and response headers, the body, and the time it takes to load the assets.

HAR files are useful for technical support engineers when troubleshooting issues relating to loading speed, caching and analytics.

The HAR file may be requested by Siteimprove when troubleshooting issues.

How to generate a HAR file?

It's possible to create a HAR file in a number of browsers. 

To create a HAR file follow the steps at the Capture browser trace information website.

If you have any questions regarding this please contact Siteimprove Technical Support.

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