Synchronize vs Synchronise: Meaning, US and UK Spelling, and Examples

Synchronize vs synchronise comes down to a regional spelling difference: synchronize is the preferred spelling in American English, while synchronise is common in British English. Both words have the same meaning: to make things happen, operate, or match at the same time. The difference follows a broader spelling pattern in English, where American English often uses -ize and British English frequently accepts -ise.

Whether you are writing a business email, editing a website, explaining how to sync files, or preparing an academic document, choosing the right spelling helps you keep your writing consistent. This guide explains the difference between synchronize and synchronise, compares their related word forms, and provides practical examples to help you use each version correctly.

Synchronize vs. Synchronise: The Main Difference

Synchronize and synchronise are alternative spellings of the same verb. American English generally favors synchronize, while British English commonly uses synchronise. Neither spelling changes the meaning or grammatical function of the word. Your choice should depend on your audience, regional spelling conventions, and the style guide you follow.

Is Synchronize or Synchronise Correct?

Both synchronize and synchronise are correct spellings. The main difference is regional preference, not meaning or grammar.

Use synchronize when writing for an American audience. Choose synchronise when following a British English style that uses -ise spellings.

Here is the basic rule:

• American English: Synchronize
• British English: Synchronise
• Meaning: To make events, actions, devices, or processes occur together or match in time.
• Past tense: Synchronized or synchronised
• Related noun: Synchronization or synchronisation

For example:

• American English: “Please synchronize your calendar with your phone.”
• British English: “Please synchronise your calendar with your phone.”

Both sentences communicate exactly the same instruction.

However, British English does not require every writer to use -ise. Some British publishers and organizations prefer -ize spellings. The important point is to follow the convention required by your audience or style guide rather than assume that one spelling is universally correct in every region.

Synchronize vs. Synchronise Meaning

The words synchronize and synchronise mean to coordinate events, actions, or processes so they happen at the same time or remain consistent with one another. The term also describes adjusting clocks, aligning audio and video, and updating information across connected devices.

Consider these examples:

• The team synchronized its schedules before the conference.
• The camera system synchronised the timestamps across all recordings.
• I need to synchronize my laptop with the cloud storage account.
• The musicians synchronised their movements with the music.

Each example uses a different spelling convention or context, but the core meaning remains unchanged.

The word can describe both physical timing and digital coordination. Two dancers might synchronize their steps, while a phone synchronizes contacts with an online account. In both cases, the goal is to coordinate separate things so they work together correctly.

Quick Comparison of Both Spellings

Feature	Synchronize	Synchronise
Preferred regional use	American English	Common in British English
Part of speech	Verb	Verb
Meaning	Coordinate in time or make consistent	Coordinate in time or make consistent
Present tense	Synchronize	Synchronise
Past tense	Synchronized	Synchronised
Present participle	Synchronizing	Synchronising
Related noun	Synchronization	Synchronisation
Example	Synchronize the files	Synchronise the files

The table shows that the spelling difference extends to related forms. If you choose synchronise, you will generally use synchronised, synchronising, and synchronisation in a British -ise style. If you choose synchronize, you will generally use synchronized, synchronizing, and synchronization.

American vs. British English Spelling

The difference between synchronize and synchronise reflects a wider pattern in English spelling. American English generally prefers -ize, while many British English styles use -ise. Both systems appear in published writing, so regional spelling depends partly on the conventions adopted by a publication or organization.

When to Use Synchronize in American English

Use synchronize when writing for readers in the United States or following an American English style guide.

American English commonly uses -ize in verbs such as:

• Organize
• Recognize
• Realize
• Prioritize
• Synchronize

Their related forms follow the same general pattern:

Base verb	Past tense	Present participle	Noun
Organize	Organized	Organizing	Organization
Recognize	Recognized	Recognizing	Recognition
Prioritize	Prioritized	Prioritizing	Prioritization
Synchronize	Synchronized	Synchronizing	Synchronization

For example, an American software company might write:

“Our application automatically synchronizes your documents across all connected devices.”

The spelling matches the convention commonly used in American business writing and software documentation.

If you manage an American website, use the same convention throughout your pages, headings, product descriptions, and help articles. Consistency makes the content look professionally edited and helps readers recognize a stable house style.

When to Use Synchronise in British English

Use synchronise when your British English style guide or publication follows the -ise convention.

This spelling pattern appears in words such as:

• Organise
• Recognise
• Realise
• Prioritise
• Synchronise

The related forms generally follow the same convention:

Base verb	Past tense	Present participle	Noun
Organise	Organised	Organising	Organisation
Recognise	Recognised	Recognising	Recognition
Prioritise	Prioritised	Prioritising	Prioritisation
Synchronise	Synchronised	Synchronising	Synchronisation

For example:

“Synchronise your calendar with the office schedule before Monday.”

This wording suits a British English style that uses -ise spellings.

One detail matters here: British English also includes established -ize spellings, and some British dictionaries and publishers prefer them for words in which that ending is appropriate. Therefore, synchronise is a common British form, not a rule that every British writer must follow.

Which Spelling Should You Use for an International Audience?

For an international audience, choose one spelling system and apply it consistently. The best choice depends on your readers, your organization’s existing content, and the spelling convention used by your software or publication.

Use this practical decision process:

1. Identify your main audience. If most readers are in the United States, synchronize is a natural default. For a British audience that uses -ise, choose synchronise.
2. Check your house style. A company may require American English across all international pages or use different regional versions.
3. Review related word forms. Do not use synchronize in one paragraph and synchronisation in the next unless a deliberate style reason supports the difference.
4. Keep product wording consistent. If an interface, help center, and user manual all refer to the same function, use the same spelling convention where possible.

For example, a company that maintains separate US and UK websites might write:

• US page: “Synchronize your account to update your settings.”
• UK page: “Synchronise your account to update your settings.”

The meaning stays the same. The regional spelling simply makes each version fit its intended audience.

Synchronize and Synchronise Examples in Sentences

Examples make the spelling difference easier to understand because they show how the verb works in ordinary sentences. Both forms can describe coordinating schedules, aligning media, matching records, or updating information across devices.

Examples Using Synchronize

The following sentences use synchronize, the standard American preference.

• I need to synchronize my phone contacts with my email account.
• The software synchronizes customer records across the company’s systems.
• Please synchronize your watch with the official time.
• The editor synchronized the audio track with the video.
• We synchronized our calendars before planning the meeting.
• The fitness app synchronizes activity data with the user’s account.
• The musicians synchronized their movements with the rhythm.
• You can synchronize the files automatically or update them manually.
• The project manager synchronized the team’s deadlines to avoid scheduling conflicts.
• The system synchronizes changes whenever the device connects to the internet.

Notice that the word can take different grammatical forms. In “the software synchronizes,” the verb agrees with a singular subject. In “we synchronized,” it describes a completed action.

These differences matter more to sentence grammar than the regional spelling does.

Examples Using Synchronise

The following examples use synchronise, a common British spelling.

• I need to synchronise my phone with my laptop.
• The application synchronises new files in the background.
• Please synchronise your watch with the station clock.
• The technician synchronised the subtitles with the dialogue.
• We synchronised our schedules before arranging the visit.
• The system will synchronise the records overnight.
• The dancers synchronised their steps with the music.
• You can synchronise your contacts across several devices.
• The team synchronised its activities to meet the deadline.
• The software synchronises changes whenever an internet connection becomes available.

The examples demonstrate that synchronise works in the same grammatical situations as synchronize. You do not need to change the sentence structure when switching between the two spelling conventions.

For example, “The software synchronizes the records” and “The software synchronises the records” are both grammatically correct. The spelling choice changes, but the subject, verb tense, and meaning remain the same.

Synchronize vs. Synchronise in Technical Writing

In technical writing, synchronize and synchronise describe coordinating timing or keeping data aligned across systems. The spelling does not indicate a different feature, level of accuracy, or technical process.

Here are examples from common technology contexts:

Context	American English	British English
Cloud storage	Synchronize your files	Synchronise your files
Mobile devices	Synchronize contacts	Synchronise contacts
Audio and video	Synchronize the audio track	Synchronise the audio track
Calendars	Synchronize your calendar	Synchronise your calendar
Databases	Synchronize the records	Synchronise the records
Media subtitles	Synchronize the subtitles	Synchronise the subtitles

In a help article, the most important task is to explain what synchronization does and what the user should expect.

For instance, “Synchronize your files” tells users to align their files with another location or system. A more useful instruction might be:

“Synchronize your files to upload recent changes and make them available on your other devices.”

That sentence explains both the action and its purpose.

Practical writing tip: If you are documenting a specific application, use the wording displayed in its interface when you refer to an exact button or menu option. A product might label a command “Sync now” even when the surrounding article uses synchronize. Preserve the interface label rather than silently changing it.

Synchronize, Synchronized, and Synchronization: What’s the Difference?

Synchronize is the base verb, synchronized is its past-tense or past-participle form in American English, and synchronization is the noun describing the process or result. British -ise styles generally use synchronise, synchronised, and synchronisation.

These forms share a meaning, but they serve different grammatical purposes.

Synchronize vs. Synchronized

Synchronize describes an action, while synchronized usually describes an action that has already happened or a state resulting from coordination.

Compare these sentences:

• “We need to synchronize the two calendars.”
• “We synchronized the two calendars yesterday.”
• “The calendars are synchronized.”
• “The synchronized clocks display the same time.”

The first sentence describes an action that needs to happen. The second places the action in the past. The third describes the current state of the calendars, while the fourth uses synchronized to describe the clocks.

In British -ise spelling, these sentences use synchronise and synchronised instead.

Form	Grammatical role	Example
Synchronize	Base verb	We need to synchronize the files.
Synchronizes	Third-person singular present	The app synchronizes the files.
Synchronized	Past tense or past participle	We synchronized the files.
Synchronizing	Present participle or gerund	The app is synchronizing the files.

The same distinctions apply to synchronise, synchronises, synchronised, and synchronising.

A common mistake is to treat synchronize and synchronized as competing spellings. They are not. They are different grammatical forms of the same verb.

Synchronizing vs. Synchronising

Synchronizing and synchronising are the present participle and gerund forms of the verb. The American spelling uses -izing, while the British -ise form uses -ising.

As a present participle, the word often appears with a form of be:

• American: “The phone is synchronizing your contacts.”
• British: “The phone is synchronising your contacts.”

As a gerund, it can function as a noun:

• American: “Synchronizing the devices takes only a few minutes.”
• British: “Synchronising the devices takes only a few minutes.”

Both versions are correct under their respective spelling conventions.

When editing a long article, look for these related forms as well as the base verb. A document may look consistent at first glance but still contain mixed forms such as synchronize, synchronised, and synchronization. A final spelling review should check the entire word family.

Synchronization vs. Synchronisation

Synchronization and synchronisation are nouns that describe the process, act, or result of synchronizing. The American spelling generally uses -ization, while the British -ise convention uses -isation.

Examples include:

• American: “Synchronization keeps the files consistent across devices.”
• British: “Synchronisation keeps the files consistent across devices.”
• American: “The synchronization process finished successfully.”
• British: “The synchronisation process finished successfully.”

The noun often appears in technical documentation, business reports, and discussions of timing.

For example, a cloud service might use synchronization to ensure that a file edited on one device reflects the latest changes on another. In a music production workflow, synchronization can refer to aligning audio and video so that the sound matches the action on screen.

Although the underlying concept remains the same, the noun is not interchangeable with the verb in every sentence.

Incorrect: “We need synchronization the files.”

Correct: “We need to synchronize the files.”

Also correct: “We need synchronization of the files.”

The first correct version uses a verb after need to. The second uses the noun in a different sentence structure.

Synchronize Word Forms at a Glance

Use this table when editing content or checking a related spelling.

Word type	American English	British -ise style
Base verb	Synchronize	Synchronise
Third-person singular	Synchronizes	Synchronises
Past tense	Synchronized	Synchronised
Past participle	Synchronized	Synchronised
Present participle	Synchronizing	Synchronising
Noun	Synchronization	Synchronisation
Adjective	Synchronized	Synchronised

A useful rule is to choose the spelling convention before editing the article, then check each form against that decision. This approach prevents inconsistencies across headings, tables, examples, image captions, and calls to action.

Sync vs. Synchronize vs. Synch

Sync is a shortened form of synchronize or synchronization. Synch is another spelling sometimes used for the same informal term, but sync is the more common form in everyday technology writing. Neither short form changes the basic idea of coordinating events or keeping information aligned.

Is Sync Short for Synchronize?

Yes. Sync commonly serves as a shortened form of synchronize when used as a verb and synchronization when used as a noun.

As a verb:

• “Sync your phone with your laptop.”
• “The app syncs your files automatically.”
• “I synced my calendar before leaving the office.”

As a noun:

• “The sync finished successfully.”
• “The device needs another sync.”
• “The last sync occurred this morning.”

The short form is especially common in software interfaces because it saves space and feels direct. A button labeled “Sync now” is easier to fit into a compact interface than “Synchronize now.”

In formal writing, choose the full word when it improves clarity or suits the tone. In a user interface, support article, or casual conversation, sync is often entirely appropriate.

Is Sync or Synch the Correct Spelling?

Sync is the usual modern spelling for the shortened term in technology and everyday communication. Synch also appears in English, particularly in informal writing, but it is less common in many software and digital-product contexts.

Examples:

• “Sync your photos before changing phones.”
• “The video and audio are out of sync.”
• “The two teams need to sync their schedules.”
• “The soundtrack is not in synch with the action.”

The phrase out of sync is especially common when something no longer matches another thing in timing or state.

For example, if a video shows a person’s mouth moving before the voice reaches the speakers, the audio and video are out of sync.

The spelling synch is not necessarily an error in every context. However, if you are writing a help article or naming a software feature, sync is generally the more familiar and concise choice.

When Should You Use Sync Instead of Synchronize?

Choose sync when brevity matters and the meaning is obvious. Use synchronize when you need a more formal tone, a precise explanation, or a full verb that fits the sentence naturally.

Situation	Better choice	Example
Short interface button	Sync	“Sync now”
Casual conversation	Sync	“I’ll sync my calendar later.”
Formal documentation	Synchronize	“Synchronize the device with the server.”
First explanation of a technical process	Synchronize	“The application synchronizes files between devices.”
Short status message	Sync	“Last sync: 9:15 a.m.”

A simple example shows how the choice affects tone:

Casual: “Can you sync the meeting times with the team?”

More formal: “Can you synchronize the meeting times with the team’s calendar?”

Both sentences are understandable and correct. The second makes the action sound more explicit and formal.

For an article about the spelling difference, use sync as a related term rather than a substitute for every occurrence of the main keyword. Readers searching for synchronize vs synchronise primarily want the regional spelling distinction, so the article should keep that comparison central.

Common Mistakes When Using Synchronize or Synchronise

Most mistakes involving these words come from inconsistent spelling, confusion between verbs and nouns, or a mismatch with a publication’s style guide. The easiest way to avoid them is to identify the intended word form and apply one regional convention throughout the document.

Mixing American and British Spellings

Mixing the two forms is not always grammatically wrong, but it can make a document look inconsistent.

For example:

“The application synchronizes files and keeps the data synchronised.”

The sentence combines the American synchronizes with the British synchronised. A consistent American version would be:

“The application synchronizes files and keeps the data synchronized.”

A consistent British -ise version would be:

“The application synchronises files and keeps the data synchronised.”

The same check should cover related words such as organize/organise, prioritize/prioritise, and recognize/recognise.

Editing tip: Search your document for both endings. Checking only the main keyword may miss inconsistent past-tense, participle, and noun forms.

Confusing the Verb With the Noun

The verb and noun describe related ideas, but they cannot always replace one another.

Incorrect or awkward sentence	Better sentence
We need to synchronization the files.	We need to synchronize the files.
The application will synchronization your contacts.	The application will synchronize your contacts.
We need to synchronize of the records.	We need to synchronize the records.
The synchronize is complete.	The synchronization is complete.
The files are synchronization.	The files are synchronized.

Use the verb when describing an action: “The system synchronizes the files.”

Use the noun when describing a process or event: “The synchronization is complete.”

These distinctions apply to both American and British spelling.

Choosing a Spelling That Conflicts With a Style Guide

A spelling can be correct in general English but still conflict with a specific publication’s requirements.

For example, an American publication may require synchronize, while a British publisher may use synchronise. A company that publishes both US and UK versions may have separate rules for each region.

To avoid problems:

• Check the organization’s style guide before editing.
• Follow the spelling used in the surrounding content.
• Preserve exact product names and interface labels.
• Check related forms, not just the base verb.
• Use the same spelling system across headings, tables, captions, and examples.

A style guide matters most when several people edit the same website or document. Without a shared rule, one writer may use synchronize, another may use synchronise, and a third may alternate between both forms.

Consistency gives readers a smoother experience and reduces unnecessary editing work.

Which Spelling Should You Choose?

Choose synchronize for most American English content and synchronise when following a British English style that favors -ise. Both forms are correct, so your decision should reflect the intended audience and the spelling convention used throughout the document.

A Quick Rule for American English

For American English, use the -ize family:

• Synchronize
• Synchronized
• Synchronizing
• Synchronization

Example:

“Synchronize your files to make the latest version available on your other devices.”

This spelling fits American business writing, software documentation, and general educational content.

A Quick Rule for British English

For British English that follows the -ise convention, use:

• Synchronise
• Synchronised
• Synchronising
• Synchronisation

Example:

“Synchronise your files to make the latest version available on your other devices.”

The sentence communicates the same action. Only the spelling convention changes.

Remember that British publishers may also use -ize spellings. Follow the style guide when one is available rather than treating every -ize word as American-only.

Keeping Spelling Consistent Across a Website or Document

If you publish articles, product documentation, or educational content, consistency should be part of your editing process.

Use this short checklist:

• Identify the target audience.
• Select American English or the intended British English convention.
• Check the main verb and all related word forms.
• Review headings, tables, examples, and image captions.
• Preserve exact wording when quoting a product interface.
• Run a final spelling check before publishing.

For example, a website that targets American readers should normally use synchronize, synchronized, and synchronization throughout its article. A British version using the -ise convention should normally use synchronise, synchronised, and synchronisation.

This small editorial decision prevents avoidable inconsistencies and makes future updates easier.

Frequently Asked Questions

Is It Synchronize or Synchronise?

Both spellings are correct. Synchronize is the preferred form in American English, while synchronise is common in British English styles that use -ise. Choose the spelling that matches your audience or style guide.

Do Synchronize and Synchronise Mean the Same Thing?

Yes. Both words mean to coordinate actions, events, devices, or processes so they happen at the same time or remain consistent. The difference is spelling, not meaning.

Is Synchronize American or British English?

Synchronize is the standard American preference. However, -ize spellings also appear in some British English publications, so the word is not exclusive to American English.

What Is the British Spelling of Synchronize?

Synchronise is a common British spelling. Its related forms include synchronised, synchronising, and synchronisation when following the same -ise convention.

Is It Synchronize or Synchronized?

Both forms are correct, but they serve different grammatical purposes. Synchronize is the base verb, while synchronized is its past-tense or past-participle form in American English. The British -ise equivalents are synchronise and synchronised.

Is Sync Short for Synchronize?

Yes. Sync is a common shortened form of synchronize when used as a verb and synchronization when used as a noun. It is widely used in technology, informal writing, and software interfaces.

Final Thoughts on Synchronize vs. Synchronise

The difference between synchronize vs synchronise is straightforward: synchronize is the preferred American spelling, while synchronise is common in British English styles that use -ise. Both forms carry the same meaning and follow the same basic grammar.

The related forms follow the same pattern in those styles: synchronized and synchronisation differ from synchronised and synchronisation only where the spelling convention requires it. When you write about syncing files, coordinating schedules, or aligning audio and video, choose the form that suits your audience and keep it consistent.