Free Punctuation Checker
Check punctuation online with a tool that fixes the marks and never touches your words. Paste up to 250 words: commas, semicolons, colons, apostrophes, hyphens and quotation marks get corrected, comma splices get caught, and every fix is listed with a one-line explanation, so you can accept the whole pass with confidence.
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How to check your punctuation in three steps
Paste your text
Up to 250 words per check: a paragraph of your paper, a cover letter, an abstract. The checker reads whole sentences, because commas cannot be judged in fragments.
Marks fixed, words untouched
Comma splices, apostrophe errors, missing hyphens in compound modifiers, misplaced semicolons and stray parentheses get corrected. Your words stay exactly as written, guaranteed by design.
Review each fix and copy
Every correction appears beside your original punctuation with a short note naming the rule. Scan the list, then copy the corrected text into your document.
Why writers use this punctuation checker
Words are off-limits
The checker corrects punctuation marks only. A sentence that would need rewording is left alone, so accepting its fixes never changes what you said.
The full mark set
Commas, semicolons, colons, apostrophes, quotation marks, hyphens, parentheses and spacing, checked together, because punctuation errors travel in groups.
Comma splices caught
The most common punctuation error in academic drafts, fixed with the smallest change that works and a note explaining whether a semicolon or a period was the right repair.
Every fix explained
Each correction carries the rule behind it, so the checker doubles as the punctuation reference you never keep open.
Punctuation is where careful writing shows
Reviewers and examiners rarely comment on punctuation, and that is exactly why it matters: they notice it silently. A comma splice in an abstract, an it's where its belongs, a compound modifier missing its hyphen, none of these will sink a paper on their own, but together they read as haste, and haste is the last impression a manuscript can afford. Punctuation errors are also the hardest class to self-catch, because you read your own sentences with the rhythm you intended rather than the rhythm the marks actually produce.
A punctuation check is therefore best done as its own pass, with a tool whose scope is deliberately narrow. The checker on this page corrects marks and only marks: it will repair the comma splice with a semicolon, restore the possessive apostrophe, and hyphenate the compound modifier, but it will not reword a sentence, ever. That constraint is what makes the pass fast to review. When every change is a mark, you can audit the whole list in under a minute and accept it without re-reading for meaning.
Two neighbouring tools cover what this one deliberately does not. The comma checker specializes in the one mark that carries most of the ambiguity, including an explicit Oxford comma mode for matching your style guide. The em dash remover deals with the punctuation signature of AI-assisted drafting, free and unlimited. And when the underlying sentence, not its punctuation, is the problem, the grammar checker is the wider net.
For complete documents, the ProofreaderPro editor proofreads punctuation alongside grammar and register across the whole manuscript, with tracked changes you approve individually, which is the same show-your-work principle this checker runs on.
Punctuation checker FAQs
What punctuation does this checker fix?
What is a comma splice and how does the checker fix it?
Will it change any of my words?
Does it handle em dashes?
Punctuation polished. Now proofread everything else.
The ProofreaderPro editor checks punctuation, grammar and academic register across your complete document, with tracked changes you accept or reject line by line. Built for researchers and students, free to try.
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