Customisable or Customizable: Which Spelling Is Correct?

Have you ever typed customisable or customizable and paused, unsure which spelling is actually correct? You’re not alone. This is a very common search because both spellings appear everywhere on websites

, in software settings, marketing copy, and product descriptions. The confusion usually comes from regional English differences rather than meaning or grammar mistakes.

People search for “customisable or customizable” to find out which version is right, whether one is more professional, and which spelling Google prefers for.

Businesses worry about consistency, writers want to avoid errors, and students want to follow correct English rules. The good news is that both spellings are correct they just follow different English standards.

This article clears the confusion once and for all. You’ll get a quick answer, learn where the spellings come from, see British vs American usage rules, and understand which spelling you should use based on your audience.

By the end, you’ll know exactly when to use customisable and when customizable, without second-guessing again.

Customisable or Customizable – Quick Answer

Both customisable and customizable are correct spellings.

Customisable → British English
Example: “The software is fully customisable for UK users.”
Customizable → American English
Example: “The app offers customizable themes.”

The meaning is exactly the same in both cases.

The Origin of Customisable or Customizable

The word customize comes from the noun custom, meaning a habit or usual practice. When English evolved in different regions, spelling rules changed slightly.

British English often keeps the -ise / -isable ending, influenced by French and traditional spelling rules. American English, guided by spelling reformers like Noah Webster, simplified many spellings to -ize / -izable.

That’s why both forms exist today. The difference is historical, not grammatical.

British English vs American English Spelling

Here’s how the spelling rules compare:

Feature	British English	American English
Preferred spelling	Customisable	Customizable
Ending used	-isable	-izable
Used in	UK, Australia, India	USA, Canada
Meaning	Same	Same

💡 Both spellings are accepted in international English, but consistency matters.

Which Spelling Should You Use?

Choose based on your audience:

US audience → Use customizable
UK & Commonwealth audience → Use customisable
Global or SEO content → Pick one spelling and use it consistently
Academic or brand writing → Follow your style guide

If your website targets American users, customizable is usually the safer choice.

Common Mistakes with Customisable or Customizable

Here are frequent errors to avoid:

❌ Mixing both spellings in one article
✅ Choose one and stay consistent

❌ Thinking one spelling is incorrect
✅ Both are correct, just regional

❌ Using the wrong spelling for your audience
✅ Match spelling to reader location

Customisable or Customizable in Everyday Examples

Email:

“This plan is fully customizable to meet your needs.”

News Article:

“The platform offers customisable features for businesses.”

Social Media:

“New update! Customizable layouts are now live 🎉”

Formal Writing:

“The system provides customisable security options.”

Customisable or Customizable – Google Trends & Usage Data

Search interest shows clear regional patterns:

Customizable dominates searches in the United States
Customisable is more popular in the UK, Australia, and parts of Asia
Global brands often choose customizable for wider reach

Both terms have strong search volume, but American spelling usually ranks higher globally.

Comparison Table: Customisable vs Customizable

Aspect	Customisable	Customizable
English type	British	American
Correct spelling	✅ Yes	✅ Yes
Meaning difference	None	None
SEO impact	Regional	Global-friendly
Usage preference	UK-focused content	US/global content

FAQs

1. Is customisable incorrect?
No, it is correct in British English.

2. Is customizable more popular?
Yes, especially in the US and global SEO content.

3. Can I use both spellings?
You can, but not in the same document.

4. Which spelling should businesses use?
Use the spelling that matches your target market.

5. Do both spellings mean the same thing?
Yes, the meaning is identical.

6. Is customizable accepted in British English?
It is understood but less preferred.

7. Which spelling does Google prefer?
Google accepts both, but customizable has wider global reach.

Conclusion

The confusion around customisable or customizable is understandable, but the rule is simple: both spellings are correct. The difference lies in regional English standards,

not meaning or quality. British English prefers customisable, while American English uses customizable.

For writers, students, and businesses, the most important thing is consistency and audience awareness. If you are targeting readers in the United States, customizable is the better choice

. If your audience is in the UK or Commonwealth countries, customisable will feel more natural. For global content, many brands choose the American spelling for broader recognition.

Once you understand the origin and usage, the choice becomes easy. Pick the spelling that fits your audience, stick with it, and write with confidence.