Half-width characters are the ASCII letters, digits and symbols in the U+0021–U+007E range; their full-width counterparts live at U+FF01–U+FF5E and take up the same width as a Japanese character. This converter maps each half-width character to that counterpart and turns the ASCII space into the ideographic space (U+3000), which is what Japanese forms and printed documents usually expect.
How to use
- Paste the half-width text — form entries, product codes, or anything with ASCII letters and digits.
- Every character from U+0021 to U+007E is replaced by its full-width form, and spaces become the ideographic space.
- Copy the result. Characters with no full-width counterpart are left untouched.
FAQ
Which characters are converted?
ASCII from U+0021 to U+007E — letters, digits and symbols — plus the ASCII space, which becomes the ideographic space U+3000. Japanese characters and anything outside that range pass through unchanged.
Why do Japanese forms ask for full-width input?
Many older systems store name and address fields assuming a fixed character width, so half-width characters break their alignment or fail validation. Converting before you paste avoids the rejection.
Can I convert it back?
Yes — the Full-width to Half-width converter applies the reverse mapping.