> zenkaku | hankaku <
Convert Japanese full-width (zenkaku) and half-width (hankaku) characters in one click, with separate switches for letters, digits, symbols, spaces and katakana.
Per-category switches
Convert letters, digits, symbols, spaces and katakana independently, for example digits only for a postal code.
Voiced marks handled
Half-width katakana with a separate voiced mark such as ｶﾞ or ﾊﾟ is merged into ガ and パ, and the reverse split works too.
Instant and private
Output updates as you type, with a count per character type. Your text never leaves the browser.
>> technical info
How Full-width and Half-width Conversion Works:
Full-width ASCII characters (U+FF01 to U+FF5E) sit exactly 0xFEE0 above their half-width ASCII counterparts (U+0021 to U+007E), and the ideographic space U+3000 maps to the normal space. Half-width katakana (U+FF61 to U+FF9F) are mapped one by one to full-width kana, and a base kana followed by ﾞ or ﾟ is combined into a single voiced character. Hiragana, kanji and emoji are never changed.
Example:
ＡＢＣ１２３ ガギ → ABC123 ｶﾞｷﾞ ABC123 ｶﾞｷﾞ → ＡＢＣ１２３ ガギ ￥ ⇄ ¥ ＼ ⇄ \ ～ ⇄ ~
Why Use This Converter:
- >Letters, digits, symbols, spaces and katakana switched separately
- >Voiced and semi-voiced kana combined and split correctly
- >Character counts per type before and after
- >Private: nothing leaves your browser
>> frequently asked questions
Q: What is the difference between zenkaku and hankaku?
A: Zenkaku (full-width) characters take the width of one Japanese character, while hankaku (half-width) characters take half of that, like normal ASCII letters and digits.
Q: Which characters are converted?
A: ASCII letters, digits and symbols, the space, and katakana together with its punctuation and the long vowel mark. Hiragana, kanji and emoji stay as they are.
Q: How are ｶﾞ and ﾊﾟ handled?
A: To full-width, a half-width base kana plus ﾞ or ﾟ becomes one character (ｶﾞ to ガ, ﾊﾟ to パ, ｳﾞ to ヴ). To half-width, ガ becomes the two characters ｶﾞ. Kana such as ヵ, ヶ, ヮ and ヰ have no half-width form and are left unchanged.
Q: What happens to the yen sign and the tilde?
A: The full-width yen sign ￥ maps to ¥ (U+00A5), ＼ to the backslash and ～ to the ASCII tilde, and the reverse direction does the same.
Q: Is my text uploaded?
A: No. Everything runs locally in your browser.