What are fullwidth and halfwidth characters?

Fullwidth characters each occupy a square-shaped cell (mainly used in East Asian text), while halfwidth characters are the normal, half-width Latin ASCII form.

Does this apply to Korean text?

Korean characters themselves aren't converted — only fullwidth Latin letters, digits, and symbols (like ＡＢＣ１２３) are converted to halfwidth.

Is my text sent to a server?

No. Conversion happens entirely in your browser.

Is the fullwidth space converted too?

Yes — U+3000 becomes a normal space (U+0020). Fullwidth spaces are a common cause of search and parsing bugs.

Where does fullwidth text come from?

Typing alphanumerics in a Japanese IME, or copying from legacy systems and forms.

🔤 Fullwidth / Halfwidth Converter

Convert fullwidth characters to halfwidth ASCII, or halfwidth ASCII to fullwidth.

Input

Result

How to use

Enter text containing fullwidth or halfwidth characters.
Click the conversion direction you want.
Copy the result to use it.

🎯 Use Cases

Convert fullwidth digits copied from a Japanese site to halfwidth
Clean up fullwidth spaces in spreadsheet data
Normalize characters before form validation

Example

Input

Ｈｅｌｌｏ，　Ｗｏｒｌｄ！　＄１，２３４．５６

Output

Hello, World! $1,234.56

Clicking "Fullwidth → Halfwidth" turns fullwidth letters, digits, and symbols (Ｈ, ＄, １, etc.) into halfwidth ASCII, and also normalizes the fullwidth space (　) to a regular space.

Fullwidth vs halfwidth

Fullwidth (全角) characters take a CJK-width cell — they come from Japanese/Chinese input methods and legacy systems. Converting them to halfwidth ASCII makes searching and parsing reliable.

Type	Example	Notes
Fullwidth alphanumerics	`ＡＢＣ１２３`	Same letters but different code points
Fullwidth symbols	`！＃＄％＠`	Fullwidth special characters
Halfwidth ASCII	`ABC123`	Standard characters required by forms and code
What converts	Letters, digits, ASCII symbols, spaces — Korean jamo and hanja unaffected

FAQ

What are fullwidth and halfwidth characters?: Fullwidth characters each occupy a square-shaped cell (mainly used in East Asian text), while halfwidth characters are the normal, half-width Latin ASCII form.
Does this apply to Korean text?: Korean characters themselves aren't converted — only fullwidth Latin letters, digits, and symbols (like ＡＢＣ１２３) are converted to halfwidth.
Is my text sent to a server?: No. Conversion happens entirely in your browser.
Is the fullwidth space converted too?: Yes — U+3000 becomes a normal space (U+0020). Fullwidth spaces are a common cause of search and parsing bugs.
Where does fullwidth text come from?: Typing alphanumerics in a Japanese IME, or copying from legacy systems and forms.