Usage of UTF-8 broken down by site elements

This diagram shows the percentages of websites using UTF-8 broken down by site elements. See technologies overview for explanations on the methodologies used in the surveys.

How to read the diagram:
UTF-8 is used by 98.7% of all the websites whose character encoding we know.
UTF-8 is used by 98.7% of all the websites whose character encoding we know and that use CSS as site element.

Overall

98.7%

CSS

98.7%

Compression

98.9%

Default protocol https

99.2%

98.7%

Default subdomain www

98.9%

HTTP/3

99.6%

HTTP/2

99.1%

HTTP Strict Transport Security

99.4%

99.1%

98.6%

99.7%

70.1%

98.8%

W3Techs.com, 24 May 2025

Percentages of websites using UTF-8 broken down by site elements

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Technology Brief
UTF-8
Category: Character Encodings
UTF-8 (8-bit Unicode Transformation Format) is a variable-length character encoding for Unicode, which is backwards compatible with ASCII.
Website: datatracker.ietf.org/...

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