Full Half Width ConverterConvert full-width and half-width ASCII characters locally.

Full Half Width Converter

Convert full-width and half-width ASCII characters locally.

Output
AppHelp 123!

Features

  • Convert fullwidth (CJK) characters to halfwidth (ASCII)
  • Convert halfwidth ASCII to fullwidth equivalents
  • Optional space conversion
  • Local-only processing — no upload

Frequently asked questions

What are fullwidth and halfwidth characters?
Fullwidth characters are double-width forms used in CJK typography (e.g. ‘Ａ’, ‘，’); halfwidth are standard ASCII width (‘A’, ‘,’).
Does it work on Chinese punctuation?
Yes. The tool converts fullwidth punctuation like ‘，。！’ to ASCII ‘,.!’ and back.
Is the conversion lossless?
For supported characters, yes. Round-tripping a string through full → half → full preserves the original characters.