horizontal writing; writing horizontally
Refers to text written left-to-right, as opposed to the traditional vertical (top-to-bottom) style. Common in modern Japanese for digital text, academic papers, and many printed materials.
See also: 縦書き
Many Japanese textbooks are written horizontally.
この書類は横書きでお願いします。
Please write this document horizontally.
Please format this document in horizontal writing.
I wrote the letter in horizontal script.