What this converter can do
- Fullwidth ↔ halfwidth for ASCII letters, numbers, and symbols.
- Hiragana ↔ Katakana and Katakana full ↔ half width.
- Optional space normalization that respects line breaks.
- Auto-converts as you type, with one-click copy for results.
Convert instantly
Clean up Japanese text
Paste text, pick a conversion type, and see the result update automatically. No data leaves your browser.
Switch between kana or width styles without reformatting the rest of your text.
Preview
Frequently asked questions
Does the text leave my browser?
No. All conversions run locally, so pasted names or drafts never leave your device.
What does Normalize spaces do?
It collapses repeated spaces and tabs (including fullwidth spaces) into single spaces per line, keeping line breaks while cleaning extra spacing.
What is the difference between kana conversion and width conversion?
Kana conversion changes script style (Hiragana/Katakana), while width conversion changes character width (fullwidth/halfwidth). They are independent operations.
Will punctuation and numbers also be converted?
Yes, when width conversion is enabled. Fullwidth symbols and digits can be converted to halfwidth forms for system compatibility.
How can I avoid breaking CSV or TSV imports?
Run a small sample export after conversion, verify delimiters and quotes, then apply the same settings to the full dataset.