noun
on paper; in writing; in the newspapers
Refers to something appearing in a written medium: a newspaper, letter, document, or theoretical plan. Often used in contrast to actual implementation or spoken word.
彼の提案は紙上では完璧に見えるが、実行は難しい。
His proposal looks perfect on paper, but it's hard to implement.
その事件は翌日の紙上で大きく報じられた
The incident was widely reported in the next day's newspapers.