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Full-width / Half-width Converter
Convert ASCII letters, numbers, symbols, and spaces between full-width and half-width forms.
Result
Ｋａｒｕ Ｔｏｏｌｓ ２０２６！ ＡＢＣ ｘｙｚ １２３Features of the Width Converter
Convert letters, numbers, symbols, and spaces between half-width and full-width forms. This is useful when cleaning form input, preparing Japanese text data, or normalizing mixed-width strings.
Katakana width conversion is outside the current scope. The tool currently focuses on ASCII characters, common symbols, and spaces.
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.
This tool targets ASCII letters, numbers, common symbols, and spaces. 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 ASCII letters, numbers, common symbols, half-width spaces, and full-width spaces.
Does it convert katakana?
Not yet. This tool currently focuses on ASCII letters, numbers, symbols, and spaces.
Is the input saved?
No. Conversion runs locally in your browser.