noun which may take the genitive case particle 'no', noun
Describes a state or action not connected to a network or the internet. Used as a noun or with の to modify another noun.
このアプリはオフラインでも使えます。
This app can be used even when offline.
オフラインの地図をダウンロードしておいた。
I downloaded an offline map in advance.
オンライン means 'online', the opposite state of being connected to a network.
Loanword from English 'offline'.