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A run-on sentence joins two or more independent clauses without the correct punctuation or conjunction. The two main types are fused sentences (no punctuation at all between clauses) and comma splices (only a comma separating clauses that need a stronger break). Both make writing harder to follow and can cost you points in academic grading or credibility in professional documents.
A fused sentence pushes two complete thoughts together with nothing between them.
A comma splice uses a comma where a period, semicolon, or conjunction is needed.
Some sentences are grammatically correct but so long that readers lose the thread. The checker flags sentences above a reasonable word count so you can decide whether to split them for clarity.
Run-ons aren't just a grammar technicality. They confuse readers because the relationship between ideas is unclear. In academic writing, run-ons signal weak sentence control and often lower your grade. In business writing, they slow down busy readers who need to extract information quickly.
Paste your text into the tool above. The checker analyzes clause boundaries, punctuation, and conjunctions to identify fused sentences, comma splices, and excessively long constructions. Each issue is highlighted with a suggestion for how to fix it. You can correct errors directly or use the suggestions as a guide while editing in your own document.
The tool works with academic essays, emails, blog posts, and any other English text. No account or download required.
Try our grammar checker to catch errors automatically, or use the paraphrasing tool to improve sentence clarity.