Is It Personalised or Personalized?

If you're in a Commonwealth country, then it's probably personalise, if you're in the US, it's personalize. This is related to etymology. All of these words are of both French and Latin origin, with the US preferring Latin and the UK preferring French spellings.

How do you spell Personalisation UK?

(UK) Alternative spelling of personalization.

What you mean by personalized?

1 : personify. 2 : to make personal or individual specifically : to mark as the property of a particular person personalized stationery.