Both “on site” and “on-site” are correct. Use “on-site” with a hyphen before a noun as an adjective.
Use “on site” as two separate words when it follows a noun or acts as a phrase showing location.
This guide breaks down exactly when to use each form.
What Does “On-Site” Mean?
On-site uses a hyphen for describing things right before a noun, functioning as an adjective.
Example: “We have an on-site gym.”
Common uses of “on-site” in everyday writing:
- “The company offers on-site parking.”
- “There’s an on-site technician available all day.”
- “The hotel provides on-site dining options.”
“On-Site” in Different Writing Contexts
What Does “On Site” Mean?
On site, written as two words, tells where someone or something is located.
Example: “The workers are on site today.”
Common uses of “on site” in everyday writing:
- “The manager is on site now.”
- “Are you on site yet, or still on the way?”
- “Testing was completed on site last week.”
“On Site” in Different Writing Contexts
Onsite (One Word) — Is It Correct?
A closed, one-word form, onsite, also appears in casual and business writing, especially outside the U.S. It’s not the standard dictionary form, but it shows up often enough in job postings and informal contexts that it’s worth knowing.
For formal writing, sticking with the hyphenated on-site (before a noun) or two-word on site (after a verb) is the safer, more widely accepted choice.
On Site or On-Site Quick Reference
Synonyms, Antonyms & Related Phrases
Synonyms for on-site/on site: in-person, on location, on the premises, in-house.
Antonyms: remote, offsite, off-site, virtual.
Related phrases: “on-site training” (training held at the physical location), “work on site” (physically present at a job location), “on-site support” (help provided in person, not remotely).
Memory Tip
The easiest way to remember which form fits:
On-site — think “adjective attached.” The hyphen links it directly to the noun that follows, like “on-site gym” or “on-site staff.”
On site — think “location answer.” If the phrase answers the question “where,” it stays as two separate words.
Frequently Asked Questions
Is onsite one word or two words?
It can be either, depending on style. The most widely accepted forms are on-site (hyphenated, before a noun) and on site (two words, after a verb). The closed one-word form, onsite, is a less formal variant.
Is it working onsite or on site?
“Working on site” is the more standard, dictionary-supported phrasing. “Onsite” as one word is used casually but isn’t the preferred formal form.
What does “onsite” mean?
Onsite, like on-site or on site, means physically present at a specific location, such as a workplace or job location, rather than working remotely.
Does “on site” have a hyphen?
Not when it follows a verb to show location — for example, “the team is on site.” It does take a hyphen when used as an adjective before a noun, like “on-site security.”
Is “on site” grammatically correct?
Yes. On site, written as two words, is grammatically correct when describing where someone or something is located.
Are you onsite?
This casual phrasing is commonly understood to mean “Are you at the location right now?” though the more standard written form is “Are you on site?”
What does “on site” mean?
On site means physically present at a particular location, such as a job site, office, or event venue.
What does “onsite” mean according to Merriam-Webster?
Merriam-Webster generally favors the hyphenated form, on-site, as the standard adjective, rather than the closed one-word “onsite.”
Is on site hyphenated AP style?
AP Style typically uses on-site as a hyphenated adjective before a noun, while using on site as two words when it follows a verb to indicate location.
Conclusion
On-site and on site are both correct, split by grammatical role rather than meaning. Use the hyphenated form before a noun, and the two-word form after a verb to show location. The closed form, “onsite,” remains more casual and less standard in formal writing.
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