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“On-site” is an adjective. It comes before the noun it describes.

“On site” is a prepostitional phrase. It comes after the noun it describes.

“Onsite” is not a thing, but it looks like the name for a pretty rock.

It’s preferable to use the two-word version, to avoid confusion regarding hyphen use.

Example

Avoid: Onsite parking
Try: On-site parking
Try: Parking on site