Free Comma Checker With the Oxford Comma Your Way
Check comma placement online, with the Oxford comma handled your way. Pick serial comma or not, paste up to 250 words, and get missing, misplaced and unnecessary commas fixed, comma splices repaired, and every correction explained, while your words stay exactly as you wrote them.
Paste or type your text, then run the tool. Results appear below in seconds.
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How to check your commas in three steps
Choose your list style
Oxford comma for APA, Chicago and most US academic styles; no Oxford comma for AP and many British house styles. The checker applies your choice consistently to every list.
Paste and check
Up to 250 words per check. Introductory commas, paired commas around nonrestrictive clauses, list punctuation and comma splices are all corrected in one pass.
Review the fixes and copy
Each fix shows your original wording, the correction and the rule applied. Comma splices note the semicolon repair explicitly. Copy the corrected text when you are satisfied.
Why writers use this comma checker
Your serial comma, your call
The one comma rule style guides genuinely disagree on is an explicit toggle, not a hidden assumption. Match APA and Chicago, or AP, in one click.
Splices repaired properly
Two sentences joined by a bare comma get a semicolon, with a note saying so, never a silent rewording of your clauses.
Meaning-bearing commas
Paired commas around nonrestrictive clauses are checked both ways, because in research writing that pair can change the scope of your claim.
Commas only
Words and other punctuation stay untouched, which makes the pass fast to audit and safe to accept.
The comma is the hardest working mark in academic writing
No other punctuation mark does as many jobs as the comma: separating list items, setting off introductions, pairing around asides, and marking the boundary where one clause hands off to the next. That workload is why comma errors dominate the mechanical corrections in academic editing, and why the same writer can punctuate the same construction three different ways in one manuscript, especially in a document written across weeks.
It is also the mark where correctness and style overlap most. The Oxford comma question has no universal answer, only a per-style-guide one, and a checker that silently imposes either choice is making your decision for you. This checker makes the preference explicit, applies it consistently across every list it finds, and keeps the exception every guide agrees on: when omitting the serial comma creates real ambiguity, the comma stays, with a note explaining why. Meanwhile the commas that do carry meaning, the pairs around nonrestrictive clauses, get checked in both directions, because a missing half of that pair quietly changes what your sentence claims.
Commas travel with company. If your draft's issues extend to semicolons, apostrophes and hyphens, the punctuation checker runs the full mark set in one pass, with the same words-are-off-limits rule. And when sentence construction itself is the issue, comma problems are often grammar problems wearing a disguise, which is what the grammar checker is for.
One comma habit no checker fixes is the machine kind: AI-assisted drafts punctuate with metronome regularity, every clause the same length, every aside in the same place. When the commas are correct but the cadence is not yours, the TextPulse humanizer reworks the rhythm across the whole draft with tracked changes you approve one by one.
Example: three comma decisions in one sentence
A missing comma, an intrusive one and a list, corrected in tracked changes.
After the intervention students who completed the survey, reported higher scores lower stress and better sleep.
After the intervention, students who completed the survey, reported higher scores, lower stress and better sleep.
- MissingA comma inserted after "After the intervention"An introductory phrase is set off from the main clause; without the comma, the reader briefly parses "the intervention students" as one noun.
- ExtraThe comma in "survey, reported" is removedIt splits the subject ("students who completed the survey") from its verb, a position grammar never allows a single comma to take.
- MissingA comma inserted after "higher scores"Three items in a series are separated by commas.
This run used no-Oxford mode, so no second comma lands before "and better sleep"; Oxford mode adds it. Either way the convention is applied to every list in the text, which is what keeps a manuscript consistent.
Who uses the comma checker
Style-guide switchers
Moving between APA and AP venues means flipping the serial comma; the toggle applies your target's rule to every list.
Researchers
Nonrestrictive comma pairs can widen or narrow a claim; both halves get checked before a reviewer reads the wrong scope.
Students
Comma splices and subject-splitting commas are the two most-marked errors in essays, repaired and explained here.
Long-document writers
A thesis written across months punctuates the same list three ways; one pass makes the convention consistent.
Commas sorted.
Now unstiffen the sentences around them.
The TextPulse humanizer reworks machine-regular phrasing and pacing across your complete draft, with tracked changes you accept or reject line by line and your citations left untouched. Free demo included.