🔤 Full-Width / Half-Width Converter

Convert ASCII letters, katakana, spaces and symbols between full-width and half-width. Toggle each category. Real-time, with copy and download.

✅ 100% free · no signup · browser-only (text never leaves your device)

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ASCII (alnum) Katakana Space Symbols

Input

0 chars

Output

1

Paste your text

Paste the text you want to convert into the input box on the left.
2

Choose categories

Toggle ASCII, katakana, space and symbols to narrow what gets converted.
3

Press the direction button

Click To Half-Width or To Full-Width and the result appears on the right.
4

Copy or download

Copy to clipboard with one click or download as a .txt file.

Are dakuten and handakuten on half-width kana handled?

Yes. Sequences like ｶﾞ collapse to ガ and ﾊﾟ to パ when going to full-width; the reverse splits them back into two half-width characters.

Is my input stored anywhere?

No. Everything runs in JavaScript inside your browser; nothing is sent to any server. You can verify in the Network tab.

Does it convert hiragana too?

Hiragana has no half-width form, so it is out of scope. Convert to katakana first if you need a half-width version.

🐛 Found a bug or issue with this tool?

Free to use, no signup. Even just the steps to reproduce are helpful. Reports go directly to the operator and help us fix issues.