Review comma placement and possible comma splices.
A better writing workflow
Comma checker for splices, missing commas and extra ones
Commas raise more editing questions than most marks, because their rules mix grammar with judgment. A comma checker gives you a second opinion on each one. This Comma Checker reads your text, returns a version with suggested comma changes, and explains the rule behind every addition, removal or comma splice it finds. Your wording stays as it is unless a splice needs a joining word or a new sentence. Paste a paragraph, a page or a full essay, and decide which suggestions match what you mean.
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How to check your commas
Put the text you want reviewed into the single box. The output panel shows the revised version with notes on the comma changes it suggests, so you can match each note to the sentence it concerns and the reason given.
Paste up to 50,000 characters, or import a TXT, DOC or DOCX file.
Mention your comma style if you have one, such as “no Oxford comma”.
Run the check and compare each note with your original sentence.
Keep the changes that match your meaning, then copy or download.
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Comma rules it reviews
The review looks at where commas change how a sentence is read, not just where a pause feels natural. Reading aloud is a weak guide to commas, so the notes name the actual rule instead.
Comma splices: two complete sentences joined by a comma alone.
Commas after introductory words, phrases and clauses.
Pairs of commas around non-essential information.
Commas before and, but, or and so when they join two independent clauses.
Commas that do not belong, such as one between a subject and its verb.
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Illustrative example
Input: “After the meeting ended the team, reviewed the budget, it was over by ten percent.” A typical result adds a comma after “ended”, removes the one between “team” and “reviewed”, and flags a comma splice before “it”, suggesting a period or “and it was”. Illustrative only, not recorded tool output.
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Four ways to fix a comma splice
When two complete thoughts share one comma, there are several correct repairs. The best one depends on how closely the ideas are related and on the rhythm of the surrounding paragraph.
Split them into two sentences with a period.
Use a semicolon when the ideas are closely linked.
Add a coordinating conjunction such as and, but or so after the comma.
Make one clause dependent with a word like because, although or when.
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Commas that are a style choice
Some commas are optional. The serial (Oxford) comma before the last item in a list, a comma after a short introductory phrase, and a comma before a brief closing clause are all handled differently by different style guides. State your preference in the text, and the checker will apply it consistently instead of switching between styles.
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Comma Checker or Punctuation Checker?
Use this tool when commas are the main worry, for example in long sentences, lists, or text written by someone who learned another language’s comma habits. When apostrophes, quotation marks, colons and dashes need attention too, the Punctuation Checker reviews every mark in one pass.
Answers for your next draft
Comma Checker FAQ
Where does the comma go in this sentence?
Paste the sentence with a little of the surrounding text and run the check. The result places the comma, or removes it, and names the rule it is following. Context helps, because the same words can need different commas depending on what the sentence is meant to say.
Do I need a comma before “and”?
Only in certain cases. Use one when “and” joins two complete clauses, as in “The data was late, and the report slipped.” Skip it when “and” links two verbs that share one subject. In a list, the comma before “and” is the serial comma, which is a style choice.
Should I use the Oxford comma?
Either choice is correct as long as you are consistent; many academic and book styles use it, while many news styles leave it out. It can prevent ambiguity in lists of names. Tell the checker which way you prefer, or it will follow the pattern most of your text already uses.
Will the comma checker rewrite my sentences?
It keeps your words in place and changes commas only. The exception is a comma splice, where a fix may need a period, a semicolon or a short joining word. Those notes describe the options so you can pick the repair that keeps your meaning.
Does it work for dialogue and fiction?
Yes, though fiction bends comma rules on purpose. Commas in dialogue tags and direct address are reviewed, but you should keep any comma you placed for rhythm or voice. Add a note such as “this is fiction, keep stylistic choices” before the text.
Is it useful for second-language writers?
Comma habits often carry over from a first language, for example a comma before every “that” clause, or long chains of clauses joined only by commas. The explanation attached to each change shows which of your habits differ from English conventions, so the same fix gets easier to spot next time.
Can I check a whole essay in one go?
Yes. A single check accepts up to 50,000 characters, and you can import a TXT, DOC or DOCX file up to 10 MiB. For a long paper, working section by section keeps the list of notes short enough to review with care.
Is the Comma Checker included in my plan?
Checks run on a signed-in account and count against the word allowance of a paid plan. You can paste a paragraph and add your comma preferences before signing in, then run the check.
Check the commas in a passage
Paste a passage you are unsure about and compare each suggested comma with the rule given beside it.
