Secure client-side processing
Full-width / Half-width Convertidor
Convert alphanumerics, symbols, and katakana between full-width and half-width in your browser.
Entrada
0 characters
Resultado
Conversion runs automatically as you type.
Letters (English)
Numbers
Symbols
Katakana
Did you know?
Half-width katakana was originally created to save memory on early computer systems. Today, it is mostly used as a stylistic choice.
ｱｲｳｴｵ
アイウエオ
Frequently Asked Questions (FAQ)
Is my data sent anywhere?
No. All conversion runs locally in your browser. Your input text is never sent to any server.
Are any characters unsupported?
It supports basic letters, numbers, symbols, and katakana. It does not convert environment-dependent characters, emoji, or kanji.
What happens to voiced sound marks in half-width katakana?
When converting to full-width, the base character and dakuten/handakuten are combined into one character (e.g., ｶﾞ -> ガ). When converting to half-width, they are split into two characters.