Fullwidth form

A Korean command prompt (cmd.exe) showing halfwidth and fullwidth characters.

In CJK (Chinese, Japanese and Korean) computing, graphic characters are traditionally classed into fullwidth (in Taiwan and Hong Kong: 全形; in CJK and Japanese: 全角) and halfwidth (in Taiwan and Hong Kong: 半形; in CJK and Japanese: 半角) characters. With fixed-width fonts, a halfwidth character occupies half the width of a fullwidth character, hence the name.

In the days of computer terminals and text mode computing, characters were normally laid out in a grid, often 80 columns by 24 or 25 lines. Each character was displayed as a small dot matrix, often about 8 pixels wide, and an SBCS (single byte character set) was generally used to encode characters of western languages.

For a number of practical and aesthetic reasons, Han characters would need to be twice as wide as these fixed-width SBCS characters. These "fullwidth characters" were typically encoded in a DBCS (double byte character set), although less common systems used other variable-width character sets that used more bytes per character.

Halfwidth and Fullwidth Forms is also the name of a Unicode block U+FF00–FFEF.

In Unicode [edit]

In Unicode, if a certain grapheme can be represented as either a fullwidth character or a halfwidth character, it is said to have both a fullwidth form and a halfwidth form.

Halfwidth and Fullwidth Forms is the name of Unicode block U+FF00–FFEF, the last of the Basic Multilingual Plane excepting the short Specials block at U+FFF0–FFFF.

Range U+FF01–FF5E reproduces the characters of ASCII 21 to 7E as fullwidth forms, that is, a fixed width form used in CJK computing. This is useful for typesetting Latin characters in a CJK environment. U+FF00 does not correspond to a fullwidth ASCII 20 (space character), since that role is already fulfilled by U+3000 "ideographic space."

Range U+FF65–FFDC encodes halfwidth forms of Katakana and Hangul characters – see half-width kana. Range U+FFE0–FFEE includes fullwidth and halfwidth symbols.

Chart [edit]

Main article: Halfwidth and Fullwidth Forms (Unicode block)

Halfwidth and Fullwidth Forms^[1] Unicode.org chart (PDF)
	0	1	2	3	4	5	6	7	8	9	A	B	C	D	E	F
U+FF0x		！	＂	＃	＄	％	＆	＇	（	）	＊	＋	，	－	．	／
U+FF1x	０	１	２	３	４	５	６	７	８	９	：	；	＜	＝	＞	？
U+FF2x	＠	Ａ	Ｂ	Ｃ	Ｄ	Ｅ	Ｆ	Ｇ	Ｈ	Ｉ	Ｊ	Ｋ	Ｌ	Ｍ	Ｎ	Ｏ
U+FF3x	Ｐ	Ｑ	Ｒ	Ｓ	Ｔ	Ｕ	Ｖ	Ｗ	Ｘ	Ｙ	Ｚ	［	＼	］	＾	＿
U+FF4x	｀	ａ	ｂ	ｃ	ｄ	ｅ	ｆ	ｇ	ｈ	ｉ	ｊ	ｋ	ｌ	ｍ	ｎ	ｏ
U+FF5x	ｐ	ｑ	ｒ	ｓ	ｔ	ｕ	ｖ	ｗ	ｘ	ｙ	ｚ	｛	｜	｝	～	｟
U+FF6x	｠	｡	｢	｣	､	･	ｦ	ｧ	ｨ	ｩ	ｪ	ｫ	ｬ	ｭ	ｮ	ｯ
U+FF7x	ｰ	ｱ	ｲ	ｳ	ｴ	ｵ	ｶ	ｷ	ｸ	ｹ	ｺ	ｻ	ｼ	ｽ	ｾ	ｿ
U+FF8x	ﾀ	ﾁ	ﾂ	ﾃ	ﾄ	ﾅ	ﾆ	ﾇ	ﾈ	ﾉ	ﾊ	ﾋ	ﾌ	ﾍ	ﾎ	ﾏ
U+FF9x	ﾐ	ﾑ	ﾒ	ﾓ	ﾔ	ﾕ	ﾖ	ﾗ	ﾘ	ﾙ	ﾚ	ﾛ	ﾜ	ﾝ	ﾞ	ﾟ
U+FFAx	ﾠ	ﾡ	ﾢ	ﾣ	ﾤ	ﾥ	ﾦ	ﾧ	ﾨ	ﾩ	ﾪ	ﾫ	ﾬ	ﾭ	ﾮ	ﾯ
U+FFBx	ﾰ	ﾱ	ﾲ	ﾳ	ﾴ	ﾵ	ﾶ	ﾷ	ﾸ	ﾹ	ﾺ	ﾻ	ﾼ	ﾽ	ﾾ
U+FFCx			ￂ	ￃ	ￄ	ￅ	ￆ	ￇ			ￊ	ￋ	ￌ	ￍ	ￎ	ￏ
U+FFDx			ￒ	ￓ	ￔ	ￕ	ￖ	ￗ			ￚ	ￛ	ￜ
U+FFEx	￠	￡	￢	￣	￤	￥	￦		￨	￩	￪	￫	￬	￭	￮
Notes 1.^ As of Unicode version 6.1

External links [edit]

http://www.alanwood.net/unicode/halfwidth_and_fullwidth_forms.html
http://everything2.com/index.pl?node=Halfwidth%20and%20Fullwidth%20Forms
Fullwidth character converter [1]

Unicode

Code points

Characters

Special purpose	BOM Combining grapheme joiner Left-to-right mark / Right-to-left mark Soft hyphen Zero-width joiner Zero-width no-break space Zero-width non-joiner Zero-width space

Lists	CJK Unified Ideographs Combining character Duplicate characters Numerals Scripts Spaces Symbols Halfwidth and fullwidth

Processing

Algorithms	Bi-directional text Collation ISO 14651 Equivalence

Comparison	BOCU-1 CESU-8 Punycode SCSU UTF-1 UTF-7 UTF-8 UTF-9/UTF-18 UTF-16/UCS-2 UTF-32/UCS-4 UTF-EBCDIC

On pairs of
code points

Usage

Related standards

Popular search requests

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Information source: wikipedia.org

Do you want to know more? Look at the full version of the Fullwidth form article.

In Unicode [edit]

Chart [edit]

See also [edit]

External links [edit]

Popular search requests