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Asked: 2026-05-11T19:19:22+00:00

What are the implications of a change from UTF-8 to UTF-16 for HTML encoding?

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What are the implications of a change from UTF-8 to UTF-16 for HTML encoding? I would like to know your thoughts on the issue. Are there things I need to think of before making such a change?

Note: Interested due to enormous amounts of japanese and chinese text I need to handle.

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  1. Editorial Team

    I can think of a few things that will go wrong:

    1. You MUST specify that it’s UTF-16 in the HTTP header. Unlike UTF-8, UTF-16 is not ASCII compatible, which means that everything needs to be in UTF-16 from the start.
    2. Older clients don’t support UTF-16. For example, anything on Windows 9x. Possibly Mac OS9 as well.
    3. Oh, wait, I almost forgot: North America and European copies of Windows XP don’t have Asian fonts installed by default.
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