Online at is used with websites, platforms, or locations. Online for is used when something is available or intended for a purpose or audience.
Use online at with a website or service location: available online at our store. Use online for to show purpose, audience, or availability: register online for the course.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use online at to identify where something can be found online.
Use online for when applying, registering, or paying for something.
Online often directly modifies nouns.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
Use at or on to identify a site or platform.
✕ The file is online for our website. ✓ The file is online at our website.Use online for when applying or registering.
✕ She applied online at a visa. ✓ She applied online for a visa.Avoid using online twice in the same phrase.
✕ Online applications online for the course are open. ✓ Applications for the course are open online.Choose the expression that matches the intended meaning.
Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.
Yes. Online on is also common when referring to a website or platform.
It usually expresses purpose, registration, purchase, or application through the internet.
No. It can also function adverbially, as in We met online.
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