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Best Plagiarism Checker & Proofreader

Grammarly is an automated proofreader and plagiarism checker.
It makes sure everything you type is easy to read, effective, and mistake-free.

Our plagiarism checker
scans 16 billion web pages
and ProQuest's databases.
Instantly check for
hundreds of
grammatical mistakes.
Check your text
Please drag & drop a text file or copy & paste at  least a paragraph of text in the area above to start the check or use sample text
Get vocabulary enhancements and synonyms suggestions.
Works with
Word™ & Outlook®.
Trusted by students
and faculty at

Grammarly’s Plagiarism Checker

Plagiarism Checker

Grammarly’s plagiarism checker crosschecks your text against over billions of web pages, detecting plagiarized passages and highlighting sections that have been previously published elsewhere.

Writing Enhancements

Get advanced feedback on word choice, sentence structure, clarity, and conciseness. Give your ideas the polish they deserve.


Check and correct hundreds of writing issues, spanning everything from double negatives to faulty parallelisms. For more feedback, try Grammarly’s online grammar checker.
Grammar Checker Review - Brandy
Freelance Writer, Big Spring, TX
Essentially, Grammarly offers the same features as a thesaurus, a quality grammar-checking program, and a plagiarism checker. While you can purchase each of these tools separately elsewhere, Grammarly combines them, which is actually quite nice.
Plagiarism Checker Score
Score Your Writing
Grammarly generates a writing score based on the number of errors – everything from common spelling mistakes to sophisticated usage issues.
Plagiarism Checker
Grow Your Vocabulary
The words you use have an impact on the clarity of your writing. Grammarly can suggest the optimal replacement word based on its context.
Plagiarism Checker Linguists
Built by Professional Linguists
Our team of linguists and natural language processing engineers make sure Grammarly is always performing at the highest level possible.
Grammarly Writing Community
Millions of people use Grammarly’s plagiarism checker

Whether your writing is read by thousands of people online or just your professor, citing your sources correctly is vital. Grammarly’s plagiarism checker saves you time while helping you achieve better grades.

Check for plagiarism now