Free Comma Checker Set Your Own Oxford Comma Preference
Comma placement checked against whichever convention you pick, rather than one built in by default. Turn the serial comma on or off, submit up to 250 words, and the pass restores missing commas, deletes ones that do not belong, mends any splice it finds, and states a reason for each change while leaving your sentences worded exactly as you typed them.
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How the comma checker handles a passage
Set the list style
Turn the serial comma on for APA, Chicago and most American academic styles, or off for AP and much British house style. Whatever you pick governs every list the checker finds in the passage.
Paste up to 250 words
One run resolves several jobs at once: commas after opening phrases, both members of a nonrestrictive comma pair, list punctuation under your chosen setting, and any splice hiding in a longer sentence.
Review, then take the corrected text
Every change names what stood in the original, what replaced it and why, and a splice repair calls out the semicolon it introduced by name. Copy the result once you are satisfied.
What makes this comma checker different
Serial comma, your decision
The single comma question where style guides truly split ways is a switch you control, not an assumption buried in the background. Flip it one way to match APA and Chicago, the other way for AP.
Splices mended, not papered over
A bare comma joining two full sentences becomes a semicolon, with the note saying so, rather than a quiet rewording of your clauses.
Commas that carry meaning
Both halves of a nonrestrictive comma pair are checked, since in research prose that pair sets the scope of what a sentence is actually claiming.
Nothing beyond the comma
Words and every other mark are left exactly where they were, which keeps the list short enough to audit in a glance and safe to accept whole.
Why the comma gets a checker of its own
The comma does more jobs than any other mark: it separates items in a list, sets off an opening phrase, brackets an aside, and marks the seam between one clause and whatever follows it. Because so much rides on one piece of punctuation, mistakes with it turn up in academic editing far more often than mistakes with any other mark, and the same author can punctuate one construction three separate ways inside a single manuscript, especially when the draft was assembled over many weeks.
Correctness and house style meet nowhere more directly than at this single mark. Using the serial comma has no answer that holds across every guide, only an answer tied to whichever guide governs your document, and a tool that quietly assumes one is deciding on your behalf. This checker puts the choice in the open and carries it through every list in the passage, while keeping the one carve-out every guide allows: a serial comma stays if cutting it would leave a sentence genuinely unclear, and the note says as much. The commas doing real work meanwhile, the pair bracketing a nonrestrictive clause, are checked from both sides, because dropping one half quietly narrows or widens a claim.
Commas seldom misbehave in isolation. When a draft's trouble extends to semicolons, apostrophes and hyphens, the punctuation checker runs the entire mark set in one pass under the same words-stay-put rule. And when the sentence itself, not its punctuation, is the source of the trouble, that is frequently a job for the grammar checker instead.
One comma pattern this tool cannot repair is the machine one: AI-assisted drafts tend to punctuate with metronome regularity, every clause roughly the same length, every aside parked in the same slot. When the commas are correct but the cadence is not recognizably yours, the TextPulse humanizer rebuilds that cadence across the entire draft, with tracked changes reviewed one at a time.
Example: an opening phrase, a stray comma and a list, fixed in one pass
An opening phrase without its comma, a comma splitting a subject from its verb, and a short list, corrected in tracked changes.
In the second trial participants who finished the module, showed faster responses fewer errors and higher confidence.
In the second trial, participants who finished the module, showed faster responses, fewer errors and higher confidence.
- MissingA comma inserted after "In the second trial"An opening phrase is set off from the clause that follows; without the comma, the second trial participants briefly reads as a single unit.
- ExtraThe comma in "module, showed" is removedIt sits between the subject, participants who finished the module, and its verb, a position no single comma is permitted to hold.
- MissingA comma inserted after "faster responses"Three items in a series take commas between them.
This example ran in no-Oxford mode, which is why no comma appears before "and higher confidence"; Oxford mode would add one there. Either setting is applied to every list in the passage, which is what keeps a document consistent throughout.
Who reaches for the comma checker
Writers switching style guides
Submitting to both APA and AP venues means flipping the serial comma rule; one setting applies it to every list at once.
Researchers drafting claims
A nonrestrictive comma pair can widen or narrow a finding, and both halves are verified before a reviewer reads the wrong scope into it.
Students under a rubric
Comma splices and subject-splitting commas draw more margin notes than almost anything else, and both are repaired and explained here.
Writers of long documents
A thesis written across months tends to punctuate the same construction three different ways; one pass restores a single convention.
The commas are settled. The sentences carrying them are a separate matter.
Rhythm is handled on its own.
The TextPulse humanizer revises phrasing and pacing across a full draft, with tracked changes accepted or rejected line by line and citations left in place.