Personalised vs Personalized: Which Spelling Is Correct?

The debate between personalized and personalised is a classic case of transatlantic spelling differences. Both words are completely correct, carry the exact same meaning, and are understood globally. The only thing dividing them is a single letter—z versus s—and the geographic region where your audience lives.

The Core Difference: Regional Preferences

The divergence comes down to standard conventions in American English versus British and Commonwealth English:

• Personalized (with a “z”): This is the standard spelling in American and Canadian English. It follows the American preference for the suffix -ize (derived from the Greek -izein).
• Personalised (dengan “s”): This is the standard spelling in British, Australian, New Zealand, and South African English. Commonwealth publishing houses and style guides (such as the Oxford style) typically favor the -ise suffix.

| Feature | Personalized | Personalised |
| :— | :— | :— |
| Primary Region | United States, Canada | UK, Australia, New Zealand, South Africa |
| Suffix Type | -ize | -ise |
| Global Software Default | Common (due to US tech platforms) | Common (in localized UK/EU software builds) |

Why Does the Spelling Vary?

The split dates back centuries to differing philosophies on English orthography. Noah Webster, the creator of the American dictionary, heavily championed streamlined spellings that reflected how words actually sounded, cementing the -ize ending in American English. Meanwhile, British English retained a closer link to traditional spellings, where -ise remained prominent (though British dictionaries historically accepted both, -ise became the dominant stylistic choice).

Regardless of whether you use a z or an s, the definition remains identical: tailoring an experience, product, or service to suit an individual’s specific preferences, name, or needs.

Rule of Thumb for Writers

When deciding which form to use, consistency is your best guide:

1. Know Your Audience: If you are writing marketing copy for a Chicago-based startup, use personalized. If you are drafting a corporate report for a London-based firm, use personalised.
2. Stick to a Style Guide: If an organization or publisher mandates a specific standard (like AP Style for US journalism or the Oxford Style Manual for British publications), follow their lead.
3. Avoid Mixing: Pick one style and maintain it throughout your document. Writing “personalized recommendations” in paragraph one and “personalised dashboard” in paragraph two looks careless rather than worldly.