Are my commas in the right places?

Paste your text above and click “Check Commas” — the AI verifies every comma against standard English rules: after introductory elements, around non-restrictive clauses, in series, and between independent clauses. If nothing changes, your commas were right.

What is a comma splice and how is it fixed?

A comma splice joins two complete sentences with only a comma (“It was late, we kept working”). The checker repairs splices with the lightest edit that works: a semicolon, a period, or a coordinating conjunction — whichever best fits the rhythm of your sentence.

Do I need a comma before “and”?

Before “and” joining two independent clauses — usually yes. In a list of three or more items, the serial (Oxford) comma before “and” is a style choice; the checker keeps your usage consistent throughout the text.

Is the comma checker free?

Yes — free, no sign-up, up to 20,000 characters per check.

Free AI Comma Checker

Missing comma? Comma splice? One comma too many? Paste your text and get every comma right — with the rule behind each fix if you want it.

0 / 10,000 characters

The result will appear here.

Why use this comma checker?

Every comma rule

Introductory phrases, non-restrictive clauses, lists, compound sentences, comma splices — all checked in context.

Removes extras too

Unnecessary commas break flow as badly as missing ones. The checker deletes commas that shouldn't be there.

Learn as you fix

The “With rules” mode names the exact rule behind every change — the fastest way to stop guessing.

Free, no sign-up

Up to 20,000 characters per check, instantly.

How to use the comma checker

Paste your text
A sentence or a full document — the checker reads it all in context.
Click “Check Commas”
Missing commas are added, extras removed, splices repaired.
Copy the result
Or use the “With rules” mode to see which comma rule applied to each fix.

About this comma checker

No punctuation mark causes more second-guessing than the comma. The rules are real but subtle — introductory phrases, restrictive versus non-restrictive clauses, independent clauses, series — and pause-based intuition (“put a comma where you'd breathe”) gets them wrong constantly. This free comma checker applies the actual rules, in context, to every comma in your text.

It works in both directions: missing commas are inserted, unnecessary ones removed, and comma splices — the error most likely to annoy a grader or editor — are repaired with the lightest possible edit. Your words stay exactly as you wrote them.

The “With rules” mode turns every check into a micro-lesson, naming the rule behind each fix. After a week of using it, you'll stop needing it for the common cases — which is the point. For full punctuation coverage beyond commas, use the punctuation checker.

Frequently asked questions

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