Expresses a tentative guess or possibility, often used when asking a question or making a suggestion. Similar to もしかすると but slightly more casual.
See also: もしかすると
もしかして、田中さんですか？
By any chance, are you Mr. Tanaka?
もしかして、雨が降るかもしれない。
Perhaps it might rain.
if; in case; in the event that
Used to introduce a hypothetical condition, often with a sense of 'if it happens that...'. Less common than sense 1 and can sound slightly formal or literary.
もしかして彼が来なかったら、私が代わりに行きます。
If he doesn't come, I'll go instead.
Maybe he won't come today, by any chance.
By any chance, are you Mr. Tanaka?
Could it be that we took the wrong road?