This article shows you how to enable Google's spelling and grammar checker on the Google Docs desktop site for all operating systems and in the Android mobile app.
How to Enable Spell Check in Google Docs Tutorial
The iOS and iPadOS app can’t check for grammatical or spelling errors, but it can give you basic suggestions if you set up your iPad’s keyboard correctly.
Google Docs uses colored, wavy lines when something is misspelled (red) or needs grammatical correction (blue).
One way to use the spelling and grammar checker is to get automatic suggestions as you type.
