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Full-width / Half-width Converter for Text and Katakana
Convert letters, numbers, symbols, spaces, and Japanese katakana between full-width and half-width forms, including zenkaku and hankaku text.
Result
Ｋａｒｕ Ｔｏｏｌｓ ２０２６！ ＡＢＣ ｘｙｚ １２３ カタカナFeatures of the Width Converter
Convert letters, numbers, symbols, spaces, and katakana between half-width and full-width forms. This is useful when cleaning form input, preparing Japanese text data, or normalizing mixed-width strings that include half-width kana.
Open detailed notes
Normalizing half-width ASCII
IDs, postal codes, phone numbers, CSV data, and form values often need consistent half-width letters and numbers. Normalizing width can reduce mismatches when searching or comparing text.
Using full-width letters and numbers
Printed materials, headings, drafts, and design-oriented Japanese text sometimes use full-width letters, numbers, and symbols to align visual width.
Converting half-width kana
Older Japanese datasets, product names, address books, and form responses can mix half-width kana and full-width katakana. Voiced kana such as ｶﾞ and ﾊﾟ are converted together, so you can normalize them to ガ and パ or back to half-width.
This tool targets letters, numbers, common symbols, spaces, and katakana. When cleaning names or addresses, check the converted text before using it in production data.
Frequently asked questions
What characters can this convert?
It converts letters, numbers, common symbols, spaces, half-width katakana, and full-width katakana.
What do full-width and half-width mean?
Full-width characters take a wider Japanese text form, while half-width characters are narrower. Japanese forms often call them zenkaku and hankaku.
Does it handle voiced katakana such as ガ and パ?
Yes. Half-width combinations such as ｶﾞ and ﾊﾟ are converted to ガ and パ, and full-width katakana can be converted back to half-width.
Can I normalize form inputs or CSV text?
Yes. It is useful when Japanese systems require a specific width for names, kana, postal codes, IDs, or imported CSV text.
Is the input saved?
No. Conversion runs locally in your browser.