Free AI Comma Checker

No punctuation mark causes more second-guessing than the comma. The rules are real but subtle — introductory phrases, restrictive versus non-restrictive clauses, independent clauses, series — and pause-based intuition (“put a comma where you'd breathe”) gets them wrong constantly. This free comma checker applies the actual rules, in context, to every comma in your text.

It works in both directions: missing commas are inserted, unnecessary ones removed, and comma splices — the error most likely to annoy a grader or editor — are repaired with the lightest possible edit. Your words stay exactly as you wrote them.

The “With rules” mode turns every check into a micro-lesson, naming the rule behind each fix. After a week of using it, you'll stop needing it for the common cases — which is the point. For full punctuation coverage beyond commas, use the punctuation checker.