Should you use '-ize' or '-ise'?

Could someone please tell me if it is wrong to use ‘-ize’ at the end of words such as ‘realize’? I have been told that this is an American spelling, and that it should be ‘realise’, but on the Oxford Dictionaries site, you use a ‘z’ for both the US and British dictionaries:
https://en.oxforddictionaries.com/definition/realize
https://en.oxforddictionaries.com/definition/us/realize

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