The standard expression is in line with, meaning consistent with or following something. Other prepositions usually have different meanings or are not idiomatic after in line.
Use in line with to mean consistent with rules, ideas, or expectations. In line for and in line to are possible only when line keeps its literal meaning of a queue or position, not the adjective meaning. In line inside and in line on are not standard adjective combinations.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use in line with when something matches a rule, policy, standard, or expectation.
Here line is a noun meaning a queue. The phrase is literal, not the adjective expression in line with.
In line to is used before a verb to show that someone is likely to receive or achieve something next.
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 with for agreement or consistency.
✕ The report is in line for the guidelines. ✓ The report is in line with the guidelines.Inside usually describes location, not a fixed combination after in line.
✕ The policy is in line inside the rules. ✓ The policy is in line with the rules.On may appear in some contexts, but with is usually clearer and more standard for agreement.
✕ Her views are in line on company policy. ✓ Her views are in line with company policy.Choose the expression that matches the intended meaning.
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The usual modern spelling is in line with without a hyphen.
It appears in some varieties of English to mean in agreement on a topic, but in line with is more standard and widely accepted.
It means consistent with, similar to, or following a rule, idea, or expectation.
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