Synchronise or Synchronize: Which Spelling Is Correct?

Have you ever stopped while writing and wondered whether you should use synchronise or synchronize? You’re not alone. This spelling difference confuses students, professionals, content writers, and English learners because both versions appear in books, software, dictionaries, and websites. The good news is that both spellings are correct the right choice simply depends on whether you’re writing in British English or American English.

In this comprehensive guide, you’ll discover the difference between synchronise vs synchronize, their meanings, pronunciation, word origins, examples, common mistakes, and usage tips. You’ll also learn which spelling is preferred by Oxford English Dictionary, Cambridge Dictionary, Merriam-Webster, and major style guides. By the end, you’ll know exactly when to use synchronise or synchronize and how to stay consistent in your writing.

Quick Answer

Synchronise is the preferred spelling in British English, while synchronize is the standard spelling in American English. Both words have the same meaning, pronunciation, and grammar. They mean to make two or more things happen at the same time or to keep data, devices, or activities working together in harmony.

Quick Rule:

• ✅ Synchronise → British English (UK, Australia, New Zealand)
• ✅ Synchronize → American English (United States)
• ✅ Both spellings are correct.
• ✅ Choose the spelling that matches your audience and use it consistently.

What Does Synchronise or Synchronize Mean?

The synchronise definition and synchronize definition are identical. The verb means to coordinate events, actions, or systems so they happen at the same time or work together correctly.

In modern English, the word is frequently used in technology, business, education, music, sports, healthcare, and everyday communication. For example, your smartphone may synchronize data with cloud storage, while a dance team may synchronise their movements during a performance.

Common Meanings

Depending on the context, synchronise or synchronize can mean:

• Make two or more events happen simultaneously.
• Keep devices or applications updated with the same information.
• Coordinate people or teams to work together.
• Match timing or rhythm.
• Bring separate systems into agreement.

Synchronise Meaning in Technology

In computing, synchronize means updating files, contacts, calendars, emails, or photos across multiple devices so they all contain the same information.

For example:

• Your phone can synchronize files with your laptop.
• Cloud storage services automatically synchronize data whenever changes are made.
• Google Drive helps users keep documents in sync across different devices.

Synchronise Meaning in Everyday English

Outside technology, the word simply means to coordinate or align things.

Examples include:

• Synchronising watches before a race.
• Synchronizing project deadlines among departments.
• Synchronising dance movements during a performance.
• Synchronizing work schedules with coworkers.

Common Synonyms

If you’re looking for a synchronize synonym, here are several alternatives:

• Coordinate
• Align
• Match
• Integrate
• Connect
• Harmonize
• Keep in sync
• Update
• Bring into agreement
• Work together

These synonyms are useful when you want to vary your writing while maintaining the same meaning.

Where Does the Word Come From? (Word Origin)

Understanding the history of the word makes the spelling difference easier to remember.

The word synchronize comes from the Greek roots:

• Syn- meaning together
• Chronos meaning time

Together, they describe the idea of occurring at the same time.

The spelling later entered English through French and Latin influences. Over time, British and American English adopted different spelling conventions. American English generally preferred -ize endings, while British English commonly adopted -ise endings for many verbs.

This is why we now have synchronise in British English and synchronize in American English, even though both words share the same origin and meaning.

Synchronise vs Synchronize: What’s the Difference?

Many people search for “what is the difference between synchronise and synchronize?” The answer is surprisingly simple.

There is no difference in meaning, pronunciation, grammar, or usage. The only difference is the spelling convention followed by different varieties of English.

Feature	Synchronise	Synchronize
Meaning	Make things happen together	Make things happen together
Pronunciation	Same	Same
Grammar	Same	Same
Correct?	✅ Yes	✅ Yes
Preferred In	British English	American English
Used In	UK, Australia, New Zealand	USA

So if you’re wondering “synchronize or synchronise which is correct?”, the answer is that both are correct.

British English vs American English

The spelling difference reflects one of the most common English spelling differences between British and American English.

Synchronise in British English

In the UK and many Commonwealth countries, synchronise is the preferred spelling. Schools, publishers, businesses, and government organizations typically use the -ise ending.

Examples:

• Please synchronise your calendars before the meeting.
• The dancers synchronised their movements perfectly.
• Our schedules need to synchronise before the event.
• Teachers should synchronise lesson plans across departments.

Synchronize in American English

In the United States, synchronize is considered the standard spelling. American schools, newspapers, businesses, and software companies almost always use the -ize ending.

Examples:

• Please synchronize your contacts.
• The application automatically synchronized all your files.
• We need to synchronize data between our servers.
• Your smartwatch will synchronize with your phone every hour.

Although the spelling changes, the pronunciation and meaning remain exactly the same.

What Do Major Dictionaries Say?

One reason people become confused is that trusted dictionaries sometimes display different preferred spellings.

Here’s how major dictionaries treat the word:

Dictionary	Preferred Spelling	Notes
Oxford English Dictionary	Synchronize (also accepts synchronise)	Oxford traditionally favors -ize, even in British English.
Cambridge Dictionary	Synchronise (UK), Synchronize (US)	Uses regional spelling preferences.
Merriam-Webster	Synchronize	American English standard.
Collins Dictionary	Lists both spellings	Preference depends on regional English.

This shows that both spellings are officially recognized by respected dictionaries. The important thing is to follow the spelling style appropriate for your audience.

Which Spelling Is More Common?

Many users ask, “Which spelling is more common worldwide?”

Today, synchronize appears more frequently online. This is largely because American English dominates:

• Software documentation
• Technology websites
• Programming resources
• Digital products
• International business communication

However, synchronise remains widely used in:

• United Kingdom
• Australia
• New Zealand
• Many educational institutions following British English
• Government publications in Commonwealth countries

Neither spelling is replacing the other. They simply reflect different regional writing conventions.

Which Spelling Should You Use?

The best spelling depends on who will read your writing.

Audience	Recommended Spelling
United States	Synchronize
United Kingdom	Synchronise
Australia	Synchronise
New Zealand	Synchronise
Canada	Either (follow your organization’s style guide)
International Audience	Choose one and stay consistent

If you’re writing for a global audience, consistency matters more than choosing one spelling over the other.

Pronunciation

Many learners also search for synchronize pronunciation or synchronise pronunciation.

Both spellings are pronounced exactly the same.

IPA Pronunciation:

/ˈsɪŋ.krə.naɪz/

There is no pronunciation difference between the British and American spellings. Only the written form changes.

Word Forms

Here are the different grammatical forms of the word in British and American English.

Word Form	British English	American English
Base Verb	Synchronise	Synchronize
Past Tense	Synchronised	Synchronized
Present Participle	Synchronising	Synchronizing
Noun	Synchronisation	Synchronization
Adjective	Synchronised	Synchronized

Knowing these related forms helps you maintain consistent spelling throughout your writing, especially in academic papers, business reports, and technical documentation.

Real-Life Examples

Understanding the word becomes much easier when you see it in real contexts.

Technology

Technology is where you’ll encounter synchronize or synchronise most often.

• Your smartphone automatically synchronizes contacts, calendars, and photos whenever it’s connected to Wi-Fi.
• Cloud storage services synchronise files across multiple devices so you always have the latest version.
• Most email applications automatically synchronize data between your phone, tablet, and computer.

Business

Businesses use synchronization to improve collaboration.

• Every department should synchronise project deadlines before launching a new campaign.
• The finance team uses software to synchronize records across multiple databases.
• Managers regularly synchronise schedules to avoid meeting conflicts.

Education

Schools and universities also rely on synchronized systems.

• Teachers synchronise lesson plans across different campuses.
• Students can synchronize notes using cloud-based learning platforms.
• Online learning systems automatically synchronize attendance records and assignments.

Music and Sports

The word also appears frequently in performances and competitions.

• The dancers synchronised every movement perfectly during the show.
• Olympic swimmers must synchronize their routines with incredible precision.
• The orchestra practiced for hours to synchronise every instrument.

These real-world examples show that, regardless of spelling, the meaning always revolves around working together in perfect timing or keeping things aligned.

Common Mistakes to Avoid

Even though synchronise and synchronize have the same meaning, writers often make mistakes when choosing the correct spelling. Avoiding these errors will make your writing look more professional and easier to read.

1. Mixing Both Spellings

One of the most common mistakes is switching between synchronise and synchronize in the same document.

❌ Incorrect

• The software will synchronize your files, and later it synchronises your contacts.

✅ Correct (American English)

• The software will synchronize your files, and later it synchronizes your contacts.

✅ Correct (British English)

• The software will synchronise your files, and later it synchronises your contacts.

Always stick to one spelling style throughout your writing.

2. Assuming One Spelling Is Wrong

Many people believe synchronise is incorrect because they mostly see synchronize in software, apps, and online content.

In reality, both spellings are officially accepted. The only difference is regional preference.

3. Ignoring Your Audience

If you’re writing for American readers, synchronize will feel natural.

If you’re writing for readers in the UK, Australia, or New Zealand, synchronise is generally the better choice.

4. Forgetting Related Word Forms

Many writers accidentally mix spellings in related forms.

❌ synchronise → synchronization

✅ synchronise → synchronisation

❌ synchronize → synchronisation

✅ synchronize → synchronization

Keeping all related words in the same spelling style creates a polished, consistent document.

Why Do People Confuse Synchronise and Synchronize?

It’s easy to see why these spellings cause confusion.

First, both words are pronounced exactly the same. Unlike many spelling differences, there’s no pronunciation clue to help you choose the correct version.

Second, many people use software created in the United States, such as cloud storage platforms, smartphones, and productivity tools. These applications usually display the American spelling synchronize, even if the user lives in a country that follows British English.

Another reason is that respected dictionaries recognize both spellings. For example, Oxford English Dictionary, Cambridge Dictionary, Merriam-Webster, and Collins Dictionary all accept the word, although their preferred spelling varies depending on the variety of English they follow.

Finally, global communication has blurred regional spelling differences. International companies, universities, and websites often use both forms, making it even harder for learners to know which one to choose.

Easy Memory Trick

Remember this simple rule:

S in Synchronise = S for Britain (Standard British -ise spelling)

Z in Synchronize = Z for the United States (American -ize spelling)

Whenever you’re unsure, think about your audience rather than trying to decide which spelling is “more correct.”

Similar British and American Spelling Differences

The -ise and -ize pattern appears in many English verbs.

British English	American English
Organise	Organize
Realise	Realize
Recognise	Recognize
Civilise	Civilize
Optimise	Optimize
Apologise	Apologize
Authorise	Authorize
Finalise	Finalize

Learning this pattern makes it easier to recognize other English spelling differences and improve your overall writing.

Which Countries Use Synchronise or Synchronize?

Different countries follow different spelling conventions.

Country	Preferred Spelling
United States	Synchronize
United Kingdom	Synchronise
Australia	Synchronise
New Zealand	Synchronise
Ireland	Synchronise
Canada	Either (depending on organization or publisher)
International Companies	Usually Synchronize

If you’re writing for an international audience, check your company’s editorial style guide before choosing a spelling.

Which Spelling Should Students Use?

Students should always follow the spelling style required by their school, university, or examination board.

• IELTS and most UK-based examinations generally expect British English, so synchronise is appropriate.
• TOEFL and many American universities prefer American English, making synchronize the better choice.

The most important rule is consistency. Mixing British and American spellings within the same assignment may lose marks if your instructor expects a consistent language style.

Which Spelling Should Businesses Use?

Businesses should choose one spelling based on their target audience.

• Companies serving mainly American customers should use synchronize.
• Businesses operating primarily in the UK or other British English-speaking countries should use synchronise.
• Global companies should establish an editorial style guide and follow it across websites, emails, documentation, and marketing materials.

Consistent spelling strengthens your brand and creates a more professional impression.

Common Uses in Technology

Today, the word appears most often in technology.

You may see it when you:

• Synchronize files between devices.
• Synchronize contacts on your phone.
• Synchronize calendars with your email account.
• Synchronize photos using cloud storage.
• Synchronize browser bookmarks.
• Synchronize passwords with a password manager.
• Synchronize data across multiple databases.

Whether an application displays synchronize or synchronise usually depends on its language settings or the region where it was developed.

Key Takeaways

• Synchronise and synchronize have exactly the same meaning.
• The only difference is British vs American spelling.
• Use synchronise for British English.
• Use synchronize for American English.
• Both spellings are recognized by major dictionaries.
• Choose one spelling style and remain consistent throughout your writing.

Pro Tip

If you’re unsure which spelling to use, ask yourself one question:

Who will read this?

Choosing the spelling that matches your readers’ expectations is always better than worrying about which version is “more correct.”

Did You Know?

Many people assume that every British dictionary prefers -ise spellings. However, the Oxford English Dictionary traditionally favors -ize for many verbs because of their Greek origins, while Cambridge Dictionary generally follows the more common British -ise convention. This is why you’ll occasionally see both spellings even in British publications.

Frequently Asked Questions

Is synchronise correct?

Yes. Synchronise is the standard British English spelling and is widely used in the UK, Australia, and New Zealand.

Is synchronize correct?

Yes. Synchronize is the standard American English spelling and is the preferred form in the United States.

What is the difference between synchronise and synchronize?

There is no difference in meaning, pronunciation, or grammar. The only difference is the regional spelling preference.

Is synchronize American or British?

Synchronize is primarily the American English spelling, while synchronise is more common in British English.

Why does Oxford sometimes use -ize instead of -ise?

Oxford follows a historical spelling tradition based on the Greek origins of many words, so it often recommends -ize spellings even in British English. Both forms are accepted in British English.

Which spelling is more common online?

Synchronize appears more frequently online because American English dominates technology, software, and digital publishing.

Does Grammarly accept synchronise?

Yes. Grammarly accepts synchronise when your document is set to British English and synchronize when it’s set to American English.

Should I use synchronise or synchronize in Microsoft Word?

Use whichever spelling matches your document’s language settings. Microsoft Word checks spelling based on whether you’ve selected British English or American English.

Final Thoughts

Choosing between synchronise or synchronize is much simpler once you understand the rule. Both spellings are correct, both share the same meaning, pronunciation, and grammar, and both are recognized by leading dictionaries. The only real difference is the variety of English you’re using. If you’re writing in British English, synchronise is usually the preferred choice. If you’re writing in American English, synchronize is the standard form.

Rather than asking which spelling is “better,” focus on writing for your audience. If you’re creating academic papers, business reports, blog posts, software documentation, or everyday emails, consistent spelling helps build credibility and improves readability. By following your chosen style guide and using the appropriate regional spelling, you’ll communicate clearly and confidently every time.

Actionable Takeaway

Before you publish or submit any piece of writing, check your target audience or style guide. Use synchronise for British English and synchronize for American English, then apply that choice consistently throughout your document. This simple habit will improve your writing quality, strengthen your professionalism, and ensure your content meets readers’ expectations.