Free AI Punctuation Checker

Punctuation is where careful writing shows. A misplaced comma changes meaning, a missing apostrophe undermines credibility, and inconsistent quotation marks make prose look unedited. This free punctuation checker fixes all of it — commas, periods, semicolons, apostrophes, quotes, dashes, spacing and capitalization — while leaving your actual words untouched.

That restraint is the point. When your wording is final — a pull quote, a legal paragraph, a poem, a finished essay — you don't want a checker silently rephrasing things. This tool is constrained to punctuation mechanics, so what you wrote stays exactly what you wrote, just correctly punctuated.

Use the “With explanations” mode to see the rule behind each fix. It's the fastest way to finally internalize comma splices, serial commas and the eternal its/it's distinction.

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 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.

Switch to the “With explanations” mode and every check becomes a micro-lesson, naming the rule behind each fix. After a week of it you'll stop needing the tool for the common cases, which is rather the point.