Is it finalise or finalize?

Finalize and finalize are two spellings of the verb that means “agree on a final form or plan for something” (e.g., “Let’s finalize/finalise our itinerary before we leave”).

In American English, finalize is always used. In British English, either finalize or finalise is acceptable, though Oxford style requires finalise.

QuillBot’s Grammar Checker can help you maintain consistent spelling throughout your documents.