Fullwidth Halfwidth Converter Tool
Convert between fullwidth and halfwidth characters.
Input
Settings
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How to Use
1
Enter Text
Type or paste the text you want to convert.
2
Select Direction and Target
Choose "Halfwidth → Fullwidth" or "Fullwidth → Halfwidth" and select character types.
3
Convert
Click the "Convert" button to see the result.
About Fullwidth/Halfwidth
Halfwidth characters are single-byte, while fullwidth characters are double-byte. In Japanese computing, letters, numbers, and katakana exist in both forms.
Features
- Bidirectional ConversionConvert both halfwidth to fullwidth and fullwidth to halfwidth.
- Character SelectionSelect letters, numbers, katakana, symbols, and spaces individually.
- One-click ConversionConvert all at once with a single button click.
- Privacy ProtectedAll processing happens in your browser. Data is never sent to servers.
Use Cases
- Standardizing data entry
- Normalizing form input values
- Formatting CSV data
- Consistent document formatting
- Converting strings for programming
FAQ
Is the converter free?
Yes, it is completely free. No registration required.
Which characters are converted?
Letters (A-Z, a-z), numbers (0-9), katakana, common symbols, and spaces.
Are kanji and hiragana converted?
No, kanji and hiragana do not have halfwidth forms.
Is my text saved?
No, all processing happens locally in your browser.
Can it handle long texts?
Yes, within browser memory limits.
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