Full-width / Half-width Converter
Convert between full-width and half-width for alphanumerics, symbols, spaces, and katakana. Voiced and semi-voiced marks handled correctly.
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How to use
- Enter text and choose which classes to convert (alphanumerics, symbols, space, katakana).
- Press "To half-width" or "To full-width" to see the result and copy it.
FAQ
Are voiced and semi-voiced marks handled correctly?
Yes. Pairs like ガ⇄ｶﾞ, パ⇄ﾊﾟ, and ヴ⇄ｳﾞ are combined and converted correctly.
Can I convert only some character classes?
Yes. Use the alphanumerics / symbols / space / katakana checkboxes to limit the target.
Is my data sent anywhere?
No. All conversion runs entirely in your browser.