Over a third of the languages tracked have 100.0% use of UTF-8 on the web, such as Punjabi, Tagalog, Lao, Marathi, Kannada, Kurdish, Pashto, Javanese, Greenlandic ( Kalaallisut) and Iranian languages and sign languages. As of March 2022, Breton has the lowest UTF-8 use on the web of any tracked language, with 91% use. With the exception of GB 18030 (and UTF-16 and UTF-8), other (legacy) encodings were designed for specific languages, and do not support all Unicode characters. Japanese language websites have a bit more UTF-8 use, with the legacy Shift JIS and EUC-JP encodings having a combined share of 6.3% for the rest of Japanese websites (the more popular Shift JIS has 0.1% global share). South Korea has relatively low UTF-8 use compared to most other countries at 93.7%, with the rest of websites mainly using EUC-KR which is more efficient for Korean text. Greek and Hebrew encodings are also twice as efficient, but still those languages have over 98% use of UTF-8. The single-byte Windows-1251 is twice as efficient for the Cyrillic script and is used for 7.7% of Russian websites.

Big5 is another popular Chinese encoding with less than 0.1% share world-wide, but is popular in Hong Kong and more that twice as popular in Taiwan where it has 3.8% share. GB 18030, a Chinese Unicode Transformation Format, (effectively ) has a 7.9% share of websites in China and territories and less than 0.2% share worldwide. In locales where UTF-8 is used alongside another encoding, the latter is typically more efficient for the associated language. Īll countries and virtually all of the tracked languages have less than 10% of alternative encodings on the web. UTF-8 includes ASCII as a subset almost no websites declare only ASCII used. As of March 2022, UTF-8 accounts for on average 97.7% of all web pages (and 986 of the top 1,000 highest ranked web pages, the next most popular encoding, ISO-8859-1, is used by 5 of those sites).

UTF-8 has been the most common encoding for the World Wide Web since 2008.

The ASCII-only figure includes all web pages that only contain ASCII characters, regardless of the declared header. Use of the main encodings on the web from 2001 to 2012 as recorded by Google, with UTF-8 overtaking all others in 2008 and over 60% of the web in 2012 (since then approaching 100%).

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