Grammarly Plagiarism Checker Review (11 Ques Answered!)

Grammarly as a grammar checker is unbeatable.

But what about its plagiarism checker?

Is it any good?

Let’s test.

From a usability standpoint, Grammarly belongs to the top bracket of plagiarism checkers. Just click ‘Plagiarism’ from the writing assistant and let the app work its magic. 

Keep in mind that Grammarly isn’t primarily designed as a plagiarism detection software.

Rather, it’s built as an all-in-one grammar checker software that helps writers, students, and businesses create highly engaging, flawless articles. 

Despite this, Grammarly can keep up with other plagiarism checkers that are specifically built for the job. It also offers a streamlined user experience that lets you fix grammar errors and run plagiarism checks — all in one place.

How accurate is Grammarly’s plagiarism checker?

Multiple tests and reviews online reveal that Grammarly can detect plagiarism with 86% accuracy—depending on the document being scanned. Grammarly’s plagiarism detection engine compares your text with billions of web pages, including articles from ProQuest databases. 

Still, remember that no plagiarism detector is perfect. 

Grammarly Premium may seem to return false positives frequently. But that’s mainly because it highlights even short phrases that match that from other websites. 

The good news is, Grammarly’s plagiarism checker measures matching text with percentages. 

For example, in the screenshot below, only eight words from the content match text from another article. That’s why the Grammarly editor indicates that only 1% of the text matches the source.

Use your own discretion when checking a plagiarism report from Grammarly—or any online plagiarism checker, for that matter. 

Is Grammarly plagiarism checker reliable and safe?

Grammarly Premium is trusted by millions of freelance writers, students, teachers, and agencies to ensure they put out 100% original content. It is a safe and reliable plagiarism checker that compares your text with over 16 billion pages. 

You can use the Grammarly Premium plagiarism checker for academic papers, blog posts, books, emails, social media posts, and more. 

While working on your draft, Grammarly keeps everything safe and private. To avoid unintentional plagiarism, simply rephrase or delete any matching text before anyone sees your write-up. 

Alternatively, you can use the automated reference line to properly cite your sources. 

Is Grammarly plagiarism checker as good as Turnitin?

Turnitin is a popular plagiarism detection software specifically developed for the education space. It checks for plagiarism using its content database of over 70 billion internet pages, which is massive compared to Grammarly’s 16 billion. 

Turnitin’s database also crawls around 68 million pages a day, including thousands of student papers, journals, and law reviews. 

This makes Turnitin a more thorough plagiarism checker for educators.

However, Grammarly Premium offers a more complete package for students and professionals that need to take their writing to the next level. It may not be the best plagiarism checker, but its versatile features make it a better and more cost-effective writing tool. 

Some advantages of Grammarly Premium include:

  • Work faster with streamlined grammar, punctuation, and spell checker. Fix grammatical errors in your content with one click using Grammarly’s AI-powered writing assistant. 
  • Improve writing issues that affect engagement and delivery. Get suggestions that focus on sentence structure, word choice, and formatting to maximize your article’s overall quality. 
  • Customize writing goals to keep content on-brand. Personalize Grammarly’s writing assistant according to your own writing style. 

Does Grammarly’s plagiarism checker actually work?

Yes, the Grammarly plagiarism checker definitely works like a charm. Just click the ‘Plagiarism’ button in the writing assistant panel to check for plagiarized text. 

In the example below, I used the plagiarism checker with text from my Grammarly review article.

Everything is copied—word for word. And unsurprisingly, Grammarly detects that 100% of the text is plagiarized. 

For good measure, let’s add bits of text from another website and check for plagiarism. 

After adding the duplicate text, Grammarly successfully detected plagiarism and identified the original source.

Grammarly plagiarism checker vs Turnitin vs Copyscape

Grammarly and Copyscape are dead even when it comes to plagiarism-checking capabilities. And although Turnitin utilizes more elaborate plagiarism checks, Grammarly is still the best writing tool for professional writers and students. 

After all, Turnitin doesn’t offer licenses for individual users. To use it, your education institution needs to request a quote from their account representatives.

Grammarly is the only complete, affordable, and accessible writing software/plagiarism checker that anyone can purchase. 

Grammarly plagiarism checker reviews

Still can’t decide if you should go with Grammarly’s plagiarism checker? 

To make it easier for you, here’s a roundup of customer reviews on Grammarly’s plagiarism checker:

1. “Grammarly – An Excellent Tool for Grammar & Plagiarism Checking”

2. “The best thing that ever happened to me”

3. “Grammarly makes me want to write a book…”

Can Grammarly plagiarism checker detect QuillBot or other paraphrasing tools?

No! Grammarly, as well as most plagiarism checkers in the market, aren’t able to detect text paraphrased using QuillBot or any other comparable paraphrasing tool. QuillBot uses AI, primarily Neuro-Linguistic Programming (NLP), to paraphrase large amounts of text to produce original copies. 

To test this, let’s use text from my Grammarly review article. 

As demonstrated above, Grammarly identifies the text as 100% plagiarized. 

On QuillBot, I paraphrased the entire text by pasting it into the left field and clicking ‘Rephrase.’ 

Within seconds, QuillBot generated the paraphrased text in the right field. 

Next, I copied the paraphrased text back to Grammarly and ran the plagiarism checker. 

Sure enough, Grammarly reported back that the text is original with zero signs of plagiarism. 

Frequently Asked Questions

Can Grammarly plagiarism checker compare two documents?

No, the Grammarly plagiarism checker currently doesn’t let you measure the similarity of two (or more) documents. However, it measures the percentage of plagiarized text between your article and all discovered sources on the web. 

What percentage of plagiarism is acceptable on Grammarly?

A plagiarism percentage of less than 15% on Grammarly usually only affects a few matching phrases. It’s not an exact science, so be sure to inspect the plagiarism report yourself to decide the appropriate action. 

Can I use Grammarly plagiarism checker for free?

No, you need to purchase Grammarly Premium to use the plagiarism checker tool. This costs $30 per month on a monthly subscription (or $12 per month with annual billing). You can save 25% with the Grammarly discount offer.

Does Grammarly plagiarism checker store/save your work?

Yes, drafts are saved automatically on the Grammarly Editor, but only you can access, modify, and download them (there have been zero leaks of Grammarly user information to date). Saved documents include plagiarism reports generated by the AI writing assistant.

Create thumb-stopping, 100% original content with Grammarly today

Ready to purchase Grammarly Premium and use the integrated plagiarism checker?

Buy it today and get 25% off on your monthly or yearly subscription. Follow the instructions here and start creating original content.



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