Full-Width & Half-Width Character Converter
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Convert between full-width and half-width characters with one click to fix inconsistent text formatting.
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When copying and pasting text from different sources, you often encounter formatting issues caused by a mix of full-width and half-width characters. This tool is designed to solve this exact pain point. It accurately identifies and converts ASCII characters (numbers, letters, and punctuation) between their full-width (e.g., ＂１２３＂) and half-width (e.g., "123") forms to unify your text's visual style. Full-width characters refer to the two-byte character forms used in East Asian text encoding, while half-width characters are the standard single-byte representations of ASCII characters.
How can I tell if there are full-width characters in my text?
Full-width numbers and letters are noticeably wider than their half-width counterparts. For example, a full-width "Ａ" (U+FF21) takes up more space than a half-width "A" (U+0041).
Will the conversion affect Chinese characters?
No. This tool only converts ASCII characters (letters, numbers, and punctuation). Chinese characters, which are natively full-width, will remain unchanged.
Exercise caution when converting symbols in programming code, as some languages strictly differentiate between full-width and half-width quotes or parentheses. We recommend manually verifying critical symbols after conversion.
In Japanese typography, the full-width tilde "～" (U+FF5E) and the half-width tilde "~" (U+007E) carry different semantics. Please confirm your use case before converting. A typical example is as follows:
Input: ＡＰＩ～ＵＲＬ → Output: API~URL
