Free Punctuation Checker Marks Fixed, Words Untouched
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.
Paste or type your text, then run the tool. Results appear below in seconds.
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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.
Punctuation is also half of how prose breathes, which is why AI-assisted drafts feel wrong even when every mark is technically correct: the rhythm is machine-regular. The TextPulse humanizer reworks that rhythm across a full draft with tracked changes you approve individually, the same show-your-work principle this checker runs on.
Example: a punctuation pass on one manuscript sentence
One sentence, four punctuation decisions, shown in the tracked-changes view.
The sample however was small, we therefore treated the results as preliminary and we did not test for interaction effects
The sample, however, was small,; we therefore treated the results as preliminary, and we did not test for interaction effects.
- PunctuationCommas inserted around "however"An interrupter inside a sentence is set off on both sides, never just one.
- PunctuationThe comma in "small, we" becomes a semicolonTwo complete sentences joined by a bare comma make a comma splice; the semicolon is the smallest repair because the clauses are closely related.
- PunctuationA comma inserted before "and we did not test"A comma precedes a coordinating conjunction that joins two independent clauses.
- PunctuationThe missing final period is added
The comma splice is the load-bearing fix: left in place, it merges two claims a reviewer needs to read separately. The rest is placement, and each fix names the placement rule it applied.
Who uses the punctuation checker
Researchers submitting
The silent-judgment pass: commas, apostrophes and hyphens cleaned before a reviewer reads haste into them.
Students
Comma splices are the classic essay deduction; here they are caught, repaired and explained.
Writers with final sentences
When the wording is locked and only the mechanics need polish, a words-off-limits pass is the safe one.
ESL and multilingual writers
Punctuation conventions differ across languages; every fix names the English rule it applied.
Punctuation polished.
Now fix the rhythm behind the marks.
Correct marks with machine-regular pacing still read as AI. The TextPulse humanizer reworks phrasing and rhythm across your complete draft, with tracked changes you accept or reject line by line. Free demo included.