Input
Output

Full-width characters (U+FF01–U+FF5E) look like ASCII but are separate code points, so a search for “ABC” will not match “ＡＢＣ” and a numeric field will reject “１２３”. This converter maps them back to their ASCII equivalents and turns the ideographic space (U+3000) into a normal space.

How to use

  1. Paste text copied from a Japanese form, spreadsheet or PDF.
  2. Full-width letters, digits and symbols are mapped back to ASCII, and the ideographic space becomes a normal space.
  3. Copy the cleaned text — it is now safe for search, sorting and numeric parsing.

FAQ

Why does my spreadsheet treat the numbers as text?

Excel and Google Sheets do not recognise full-width digits as numbers. Converting them to half-width makes the cells parse as numeric values.

Is half-width katakana produced?

No. This conversion covers the full-width forms of ASCII (U+FF01–U+FF5E) and the ideographic space. Katakana is left as it is.

Does it change Japanese punctuation?

No. Japanese punctuation such as 、 and 。 is left untouched. Use the punctuation converters if you need those changed.