Oxford Comma Checker
Paste your text to detect lists and check for consistent Oxford comma (serial comma) usage. See which style guides require or omit the Oxford comma.
Style Guide Preferences
Required
APA 7th Edition
Always use the Oxford comma in lists of three or more items.
Required
Chicago Manual of Style
Strongly recommends the serial comma for clarity and consistency.
Required
MLA 9th Edition
Uses the serial comma as standard practice in all lists.
Not Required
AP Stylebook
Omit the Oxford comma unless needed to avoid ambiguity.
Frequently Asked Questions
- What is the Oxford comma?
- The Oxford comma (also called the serial comma or Harvard comma) is the comma placed before the conjunction ("and" or "or") in a list of three or more items. For example, in "red, white, and blue" the comma after "white" is the Oxford comma. Without it, the list reads "red, white and blue".
- Which style guides require the Oxford comma?
- APA (7th edition), Chicago Manual of Style, MLA, and most academic publishers require the Oxford comma. The Associated Press (AP) Stylebook does not use it except when needed for clarity. When writing academic papers, you almost always need the Oxford comma.
- How does the Oxford comma checker detect lists?
- The tool scans your text for patterns containing commas followed by a conjunction ("and" or "or") that indicate a list of three or more items. It identifies both lists that use the Oxford comma and lists that omit it, highlighting any inconsistencies.
- Does inconsistent Oxford comma usage matter?
- Yes. Consistency is key in academic and professional writing. Using the Oxford comma in some lists but not others can confuse readers and may be flagged by editors. Choose one style and apply it throughout your document.