Full-Width & Half-Width Character Converter

Full-Width & Half-Width Character Converter: Core Features and Principles

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.

Why Choose Our Full-Width & Half-Width Converter?

• Accurate Conversion: Supports two-way conversion for all common ASCII characters (A-Z, 0-9, common punctuation) without missing any symbols.
• Instant Processing: Converts instantly upon input without waiting for server responses, protecting your privacy while boosting efficiency.
• Clean Interface: Complete the conversion with just one click—zero learning curve.

How to Use

1. Paste your text containing mixed full-width and half-width characters into the input box.
2. Click the "Convert to Half-Width" (or "Convert to Full-Width") button.
3. Copy the converted text directly from the result box.

Frequently Asked Questions (FAQ)

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.

Important Notes

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.

Technical Notes & Usage Tips

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