Free Run-on Sentence Checker!

SentenceCheckup eliminates sentence structure issues, run-on sentences, and sentence fragments. Make your writing error-free today!

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Free Sentence Checker

Check and correct run-on sentences in your blog posts, academic papers, and essays.

Tired of grappling with those never-ending sentences that wreck your writing flow and leave your readers confused? We get it. Sentence Checkup’s sentence checker will help you make complex sentences clearer and easy to read.

Completely free to use

Quickly checks and corrects sentences

Advanced AI Technology for enhanced accuracy

Make your sentences easy to read

Access it from any device

What is a Run-on Sentence?

A run-on sentence combines two or more independent clauses in one sentence without proper punctuation or conjunctions. It thus results in sentences that are too long and often confusing and hard to read. Think of them as sentences that are cramming multiple thoughts or ideas together without giving the reader a clear break.

How can sentence checker help?

The Sentence Checkup’s sentence checker is like having a skilled editor by your side. Our sentence checker improves your writing by making those cumbersome sentences more accurate, clear, and readable.

Simply copy and paste the text, and the tool will identify and correct run-on sentences, fragments and structure issues.

Refine and Fix Your Sentence

Corrects Comma Splices

The checker identifies and fixes comma splices. Change “He loves cooking, he often experiments with new recipes” to the grammatically correct “He loves cooking; he often experiments with new recipes.” No more pesky comma splices!

Detects and Corrects Punctuation

The punctuation checker suggests where to add necessary punctuation marks like commas, semicolons, or periods.

Adds Conjunctions

It may recommend adding conjunctions (like ‘and’, ‘but’, ‘although’, etc) to connect clauses properly. For example, in “I was tired I still finished the project,” the tool might suggest “I was tired, but I still finished the project.”

Splitting Sentences

The tool suggests splitting a run-on sentence into two or more separate sentences. From “She enjoys painting her artwork is quite impressive,” it would make two sentences: “She enjoys painting. Her artwork is quite impressive.”

Write with More Confidence

Don’t just take our word for it. Over 20,000 students, writers, and professionals like you have improved their writing with our Run-On Sentence Checker.

“As a freelance writer, I’m constantly juggling multiple projects and deadlines. This sentence checker helps me catch- those lengthy sentences that I sometimes miss in my rush. It’s incredibly user-friendly and efficient.”

Alexandra Jenkins

“I never realized how much my run-on sentences were affecting the quality of my academic papers until I started using this checker. ‘[[This tool is absolutely invaluable for any student.”

Emily Torres

“As a non-native English speaker, I often struggle with sentence structure. The sentence checker helps me understand where my sentences are too long. I highly recommend it to anyone looking to polish their writing skills.”

Jordan Kim

Don’t let long sentences slow you down.

Correct Your Run-on Sentences Now – it’s free.

How Sentence Checkup’s Sentence Checker Works

This sentence checking tool uses advanced AI to check for punctuation, grammar, and spelling errors and improve your sentences. You can check sentence structure issues in just three steps:

Step One

Copy and paste the text you want to check into our tool.

Step Two

Click the “Check” button, and it will highlight all mistakes.

Step Three

You can correct them one by one by hovering over to the highlighted text, or hit the “Correct” button to correct all errors in just one click.

FAQS

How do you check if a sentence is a run-on?

A run-on sentence is a grammatically incorrect sentence in which two or more independent clauses are combined into one sentence without appropriate punctuation or conjunctions. For instance, “John went to the store he bought some apples” is a run-on sentence. The correct sentence will be: John went to the store, and he bought some apples.

What are the 3 types of run-on sentences?

The major types of run-on sentences are: a fused sentence (when two or more clauses are combined without punctuation), a comma splice (when independent clauses are joined using only a comma and without proper punctuation), and a polysyndeton (when there are too many or unnecessary conjunctions in a sentence).

How can I check for fragment sentences online for free?

You can use Sentence Checkup’s free sentence checker tool to check for fragment sentences and correct them for enhanced clarity.

How can I check if my sentence is correct or not?

Sentence Checkup’s free grammar checker allows you to check your sentences for grammatical errors and correct them with a single click.

What are the 5 rules to fix a run-on sentence?

The 5 common rules to correct a run-on sentence include: using a period, using a comma and an appropriate conjunction, adding a transitional word, using a semicolon, and using a subordinating conjunction.

Is a run-on sentence incomplete?

A run-on sentence isn’t necessarily incomplete; it improperly joins two or more complete clauses without correct punctuation or conjunctions. It’s an error of excess, not deficiency, containing complete clauses incorrectly connected. The issue is generally with grammar and structure, not incomplete information.

What is the difference between a fragment and a run-on?

A sentence fragment is an incomplete thought or clause that lacks either a subject, a verb, or a complete idea, making it grammatically incomplete. On the other hand, a run-on sentence contains two or more complete thoughts or independent clauses that are improperly joined without correct punctuation or conjunctions. While a fragment lacks essential elements of a sentence, a run-on sentence has all the elements but connects them incorrectly.