[11] [DFN[UTF]] は、 [[Unicode]] の色々な[[符号化方式]]です。
多種多様なものが開発されましたが、現在使われているのは [[UTF-8]] (と [[UTF-16]])
です。

* UTF-1

[10] [[UTF-1]] は最初の [[UTF]] であり、当初は単に「[[UTF]]」と呼ばれていました。

* UTF の一覧

[FIG(short list)[ [12] [[UTF]]
- [2] [[UTF-1]]
- [[UTF-7]]
- [3] [[UTF-8]] ([[UTF-2]], [[FSS UTF]])
- [[CESU-8]]
- [[WTF-8]]
- [4] [[UTF-16]]
- [[UTF-16x]]
- [[WTF-16]]
- [5] [[UTF-32]]
- [6] [[UTF-EBCDIC]]
- [7] [[UTF-9]]
- [[UTF-9][RFC 4042 UTF-9]]
- [8] [[UTF-5]]
- [9] [[UTF-6]]
- [[UTF-18]]
- [[UCS-X]]
- [[UTFCP]]
- [[UTFCP2]]
- [[UTF-JP]]
- [[UTF-128]]
- [[双漢代碼]]

]FIG]

[15] [[UCS-2]] も [[UCS-4]] も[[実質]] [[UTF]] です。

[14] [[ACE]] も [[UTF]] と同類ですがあまり [[UTF]] とはいいません。

[FIG(short list)[ [17] 事実上 [[UTF]]

- [[GB 18030]]
- [[SJIS-EX]]
- [[参照符号化モデル]]

]FIG]


[13] [[UTF-2000]] は [[UTF]] ではありません。

[16] 
[CITE[UTF-8 バリエーション]], [TIME[2000-02-01T13:37:31.000Z]], [TIME[2025-05-16T15:41:42.893Z]] <http://www.asahi-net.or.jp/%7Edd6t-sg/utf.html>



* メモ

[1]
[CITE[UTF FAQ]] ([TIME[2007-02-04 15:14:19 +09:00]] 版) <http://seclan.dll.jp/ccutffaq.htm>