What is a Run-On Sentence Checker?
The Run-On Sentence Checker is designed to help you identify and fix run-on sentences quickly and easily. By using this tool regularly, you can improve your writing clarity and ensure your ideas are presented in a way that’s easy for readers to understand.
Run On Sentence Checker
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Analysis Results
What is a Run-On Sentence?
A run-on sentence occurs when two or more independent clauses (complete thoughts) are connected improperly. This typically happens when:
Here’s an example of a run-on sentence:
“The weather was beautiful we decided to go for a walk in the park.”

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Detailed Statistics
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🛠️ 5 Ways to Fix Run-On Sentences
Learn the standard techniques to correct run-on sentences in your writing
FAQs
Common questions about run-on sentences
A run-on sentence occurs when two or more independent clauses (complete thoughts) are joined improperly without correct punctuation or conjunctions. Despite common misconception, run-on sentences aren’t just long sentences—they’re improperly structured sentences regardless of length.
Run-on sentences can make your writing difficult to read and understand. They may cause readers to lose track of your main points, create confusion about relationships between ideas, and give an impression of disorganized thinking. In professional or academic contexts, excessive run-on sentences may lower your credibility.
A comma splice is actually a type of run-on sentence. It occurs specifically when two independent clauses are joined with only a comma. A run-on sentence is the broader category that includes comma splices as well as sentences where clauses are joined with no punctuation at all.
There are five main ways to fix a run-on sentence:
After: “She didn’t study for the test; consequently, she failed it.”
Separate into individual sentences – Use a period to create two complete sentences.
Before: “The meeting ran late we missed our train.”
After: “The meeting ran late. We missed our train.”
Use a comma with a coordinating conjunction – Add a comma followed by a coordinating conjunction (and, but, or, nor, for, so, yet) between clauses.
Before: “The restaurant was crowded we decided to order takeout.”
After: “The restaurant was crowded, so we decided to order takeout.”
Use a semicolon – Place a semicolon between closely related independent clauses.
Before: “The presentation was informative the slides were well-designed.”
After: “The presentation was informative; the slides were well-designed.”
Use a subordinating conjunction – Introduce one clause with a subordinating conjunction (because, although, when, if, since, etc.).
Before: “We left early the traffic was terrible.”
After: “We left early because the traffic was terrible.”
Use a conjunctive adverb with proper punctuation – Connect clauses with a semicolon, conjunctive adverb (however, therefore, meanwhile, consequently, etc.), and a comma.
Before: “She didn’t study for the test she failed it.”