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Convert full-width and half-width characters

Switch letters, digits, symbols and katakana between full-width (全角) and half-width (半角), turn hiragana into katakana, or write a name the way bank transfers need it, in your browser.

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How to use Full-width ↔ half-width converter

  1. 1

    Pick a direction

    Choose half-width, full-width, hiragana ↔ katakana, or a bank transfer name.

  2. 2

    Choose what to convert

    For width changes, select letters and digits, symbols, katakana or spaces; the rest stays as typed.

  3. 3

    Paste your text

    The result appears beside it, with the number of characters changed.

  4. 4

    Check and copy

    In bank mode, read the list of changes and any flagged characters, then copy the name into your banking app.

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Free with no sign-up and no length limit: a 100,000-character text converts as you type.

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About Full-width ↔ half-width converter

Japanese text mixes two widths of the same characters. Full-width (全角) letters, digits and katakana take a whole square, like a kanji; half-width (半角) ones take half, like Latin text. Forms are strict about which they get: a postal code or phone number field may refuse ０３ and want 03, an older system may ask for ﾊﾝｶｸ katakana, and a design may need ＡＢＣ to line up with the kanji around it. This converter switches between the two in either direction, with a choice of letters and digits, symbols, katakana and spaces, so you can change one kind and leave the rest alone.

Katakana are converted with their voicing marks: ガ becomes ｶﾞ and back again, パ becomes ﾊﾟ, and ヴ becomes ｳﾞ. A long-vowel mark typed between digits (０３ー１２３４) becomes the hyphen it was meant to be. Hiragana can turn into katakana or the other way round, which is how furigana fields want a name.

The bank transfer mode writes a name the way Japanese banks send it in the Zengin (全銀) format: half-width katakana in capitals, small ャ ュ ョ ッ written full-size as ﾔ ﾕ ﾖ ﾂ, the middle dot replaced by a space, and company types shortened to the standard abbreviations, such as ｶ) for a 株式会社 at the start. Every change is listed with the reason, characters a bank would reject are highlighted, and the length is checked against the 30 characters of the name field.

Kanji can't be converted to a width or to kana by rules alone, so they are flagged rather than guessed.

Privacy

Everything is converted by the page itself as you type, with no request to a server and nothing downloaded, so names and account details stay on your device. The last text and your settings are kept in this browser's local storage; Clear removes the text.

Features

Both directions

全角 ↔ 半角 for letters, digits, symbols, katakana and spaces, each on or off.

Bank transfer names

Zengin format with small kana written full-size, company abbreviations and the 30-character check.

Hiragana ↔ katakana

Swap scripts for furigana and フリガナ fields, half-width katakana included.

Full-width ↔ half-width converter: frequently asked questions

What is the difference between full-width and half-width characters?
Full-width (全角) characters fill the same square as a kanji, so ＡＢＣ and １２３ line up with Japanese text. Half-width (半角) characters are the narrow ones used in English, and half-width katakana such as ｶﾀｶﾅ are a narrow form kept from early computers. They look similar but are different characters, which is why a form can reject one and accept the other.
Why do banks change ャ, ュ, ョ and ッ to ﾔ, ﾕ, ﾖ and ﾂ?
The Zengin format that Japanese banks use to send transfers has no small kana, so the account name is stored with full-size letters: キャッシュ is sent as ｷﾔﾂｼﾕ and ジョウ as ｼﾞﾖｳ. When you type a recipient or sender name, writing it this way matches how the bank holds it and avoids a transfer being returned for a name mismatch.
How are company names written in a bank transfer?
Company types are replaced by short codes, with a bracket showing where they stood: 株式会社テスト becomes ｶ)ﾃｽﾄ, テスト株式会社 becomes ﾃｽﾄ(ｶ, and a type in the middle is written (ｶ). The tool knows the common ones, from 有限会社 ﾕ and 合同会社 ﾄﾞ to 医療法人 ｲ and 一般社団法人 ｼﾔ. Your bank's own list decides in the end.
Which characters are allowed in a bank transfer name?
Half-width katakana without small letters, the voicing marks ﾞ and ﾟ, capital A to Z, digits, the space and ( ) - . / are accepted everywhere. The comma, ¥, ｢ ｣ and ｦ are in the Zengin set, but some banks refuse them, so they are marked for you to check. Kanji, hiragana, the middle dot and symbols such as & are not allowed.
Can it convert kanji to half-width or to katakana?
No. Kanji have no half-width form, and their reading depends on the word, so it can't be produced by a table: 中田 may be ナカタ or ナカダ. Kanji are left as they are and, in bank mode, flagged. Type the reading in hiragana or katakana instead, or get it from a kanji-to-kana dictionary tool first and convert that.

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