Usage of operating systems broken down by SSL certificate authorities

Detailed statistics in our extensive operating systems market report.

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This diagram shows the percentages of websites using various operating systems broken down by SSL certificate authorities. Cross-technology reports only include technologies with more than 1% usage to ensure statistical significance of the results. See technologies overview for explanations on the methodologies used in the surveys.

How to read the diagram:
Unix is used by 89.6% of all the websites whose operating system we know.
Unix is used by 93.4% of all the websites whose operating system we know and that use Let’s Encrypt as SSL certificate authority.

Unix

89.6%

93.4%

92.4%

83.5%

60.7%

62.4%

Windows

10.7%

6.8%

7.9%

17.1%

41.0%

39.3%

W3Techs.com, 15 July 2025

Overall

Percentages of websites using various operating systems broken down by SSL certificate authorities
Note: a website may use more than one operating system

More detailed statistics

You can find complete breakdown reports of 32 operating systems in our operating systems market reports.

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Technology Brief
Operating Systems
An operating system of a computer is the underlying program, that performs its basic user interactions and forms the basis of all other programs.

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