- \n
- Paste the text directly into the editor<\/li>\n\n\n\n
- Or click the upload button and upload the document<\/li>\n<\/ul>\n\n\n\n
If you’re working with long research papers or essay drafts saved as PDFs, you might also want to try an AI PDF summarizer<\/a> or PDF summarizer to condense key insights before checking for originality. This can help you better understand the material and make more effective edits.<\/p>\n\n\n\n
To check your document for plagiarism, look to the top-right corner of the editor and click on the \u201cCheck for AI text and plagiarism\u201d option. <\/p>\n\n\n\n
Grammarly will start scanning the text against web pages, journals, student papers, and more, and provide you a plagiarism report on the right side of your screen within a few seconds or minutes, depending on the length of the text.<\/p>\n\n\n
\n![\"\"](\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Generative-AI-Grammarly.jpg\")
<\/picture><\/figure><\/div>\n\n\nIs Grammarly\u2019s Plagiarism Checker Accurate? <\/h2>\n\n\n\n
Now, to gauge whether Grammarly\u2019s plagiarism checker tool actually is reliable enough, we\u2019ll put it through a test. <\/p>\n\n\n\n
Test<\/h3>\n\n\n\n
We took the first 1,000 words from one of our own blog posts previously published on Undetectable AI titled What is AI-Generated Content?<\/em><\/a>, exactly as they appeared, to check for the reliability of the tool. <\/p>\n\n\n\n
In other words, we knew for a fact that this content was not original, and it should have been flagged as 100% plagiarized.<\/p>\n\n\n\n
Next, we opened the Grammarly web editor, logged into a Premium account (since plagiarism checking is only available with Premium), and pasted our 1000-word sample text directly into the editor. <\/p>\n\n\n\n
Results<\/h3>\n\n\n\n
After running the results, we found that Grammarly flagged 98% of the text<\/strong> as plagiarized. <\/p>\n\n\n
\n![\"\"](\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Grammarly-Flagged-98-1024x559.jpg\")
<\/picture><\/figure><\/div>\n\n\n98% is a very strong detection rate. It is safe to say that Grammarly caught almost the entire text, only missing a couple of very minor phrases that weren\u2019t significant enough to affect the overall outcome.<\/p>\n\n\n\n
More importantly, Grammarly correctly identified the original source. It didn’t pull any random similar websites or general topic matches. <\/p>\n\n\n\n
It actually traced the content directly back to the right blog post from which the text had been copied. <\/p>\n\n\n\n
The flagged sections were clearly highlighted inside the Grammarly editor, and it offered direct links to the original source in the sidebar. <\/p>\n\n\n\n
We also ran the same sample through Undetectable AI\u2019s plagiarism checker for a head-to-head comparison, which flagged the content as 99% plagiarized.<\/p>\n\n\n
\n![\"\"](\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Free-AI-Plagiarism-Checker-UA-1024x619.jpg\")
<\/picture><\/figure><\/div>\n\n\nOur test found the Undetectable AI\u2019s plagiarism checker to be a little bit more sensitive than Grammarly because it also picked up on a few extra phrasing overlaps that Grammarly overlooked. <\/p>\n\n\n\n
In short, if you\u2019re an educator reviewing standard student essays or assignments, Grammarly\u2019s plagiarism checker will cover almost everything you need. <\/p>\n\n\n\n
However, for higher-stakes work (like final theses or academic research journal submissions), use Undetectable AI to gain an extra edge in accuracy. <\/p>\n\n\n\n
The best part is that Undetectable\u2019s AI plagiarism is free, unlike Grammarly Plagiarism checker.
For students on the other end, tools like the plagiarism remover by PlagiarismRemover.AI<\/a> makes it easy to remove plagiarism from flagged drafts before final submission.<\/p>\n\n\n\nGrammarly Plagiarism Report: What You Get<\/h2>\n\n\n\n
When you run a plagiarism check with Grammarly, the results show up in the right-hand sidebar of the editor.<\/p>\n\n\n\n
Right at the bottom of the sidebar, Grammarly provides a statement that says \u201cX% of your text matches external sources,\u201d where X is the percentage of content copied from a source published on the internet.<\/p>\n\n\n
\n![\"\"](\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Grammarly-Plagiarism-AI-Text-Check.jpg\")
<\/picture><\/figure><\/div>\n\n\nJust above the percentage, Grammarly organizes all matched sources into a clean, stacked list. <\/p>\n\n\n\n
Each item says \u201cThis text matches\u201d and links you directly to the original source. <\/p>\n\n\n\n
When you click on the link, it opens the exact webpage or database entry, and you can immediately verify the match without doing any manual searches.<\/p>\n\n\n\n
Inside the editor itself, any text that matches a source is underlined in light blue. <\/p>\n\n\n\n
Interestingly, Grammarly\u2019s plagiarism checker also includes a note about AI-generated content detection. <\/p>\n\n\n\n
Since educators are now dealing with a wave of AI-assisted student writing, it is a great added bonus. <\/p>\n\n\n\n
If you want to get a PDF report of plagiarism, including all the sources the content is plagiarized from, you can download it by opening the \u201cOverall Score<\/strong>\u201d tab and clicking on \u201cDownload PDF report<\/strong>\u201d.<\/p>\n\n\n
\n![\"\"](\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Download-PDF-Report-1024x983.jpg\")
<\/picture><\/figure><\/div>\n\n\nBest Plagiarism Checkers Compared<\/h2>\n\n\n\n
To recap briefly, Grammarly\u2019s plagiarism checker is built into its Premium and Business plans, but it\u2019s really designed with the everyday writer in mind. <\/p>\n\n\n\n
Where it starts to fall short is when you need deep academic verification.<\/p>\n\n\n\n
Grammarly checks against ProQuest databases and over 16 billion web pages. Impressive, yes, but it doesn\u2019t match the scale or granularity of a tool needed for research purposes.<\/p>\n\n\n\n
But at $30\/month (or $12\/month billed annually), Grammarly does offer a ton of value if you’re a writer, marketer, freelancer, or student not submitting to rigorous academic standards.<\/p>\n\n\n\n
Now, let\u2019s see how it compares with other plagiarism checkers. <\/p>\n\n\n\n
Grammarly vs other popular tools<\/h3>\n\n\n\n
We\u2019ve already talked quite a bit about Grammarly and how it happens to catch plagiarism pretty well for general purposes. <\/p>\n\n\n\n
Depending on what you\u2019re writing (and who you\u2019re writing it for), there are other plagiarism checkers that fit the bill even better.<\/p>\n\n\n\n
Turnitin<\/h4>\n\n\n
\n![\"Screenshot](\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2024\/04\/turnitin-1024x513.jpg\")
<\/picture><\/figure><\/div>\n\n\nIf you\u2019ve ever been a university student, you\u2019ve probably heard of Turnitin (and maybe even feared it a little). <\/p>\n\n\n\n
Turnitin isn\u2019t available to individual users. <\/p>\n\n\n\n
It is licensed by institutions and universities swear by it because:<\/p>\n\n\n\n
- \n
- It checks against a massive academic database of student papers, academic journals, obscure conference papers, and more<\/li>\n\n\n\n
- Besides exact copy-pasted content, Turnitin is very good at spotting \u201cpatchwriting\u201d (bad paraphrasing attempts)<\/li>\n\n\n\n
- It plugs directly into learning management platforms like Canvas, Moodle, and Blackboard<\/li>\n<\/ul>\n\n\n\n
Scribbr<\/h4>\n\n\n
\n![\"\"](\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Scribbr-1024x503.jpg\")
<\/picture><\/figure><\/div>\n\n\nScribbr is an interesting hybrid. It actually uses Turnitin\u2019s backend detection technology but it’s packaged for individual users, not just institutions.<\/p>\n\n\n\n
Scribbr\u2019s plagiarism checker is best for students who are writing a thesis or dissertation but don\u2019t have university Turnitin access. <\/p>\n\n\n\n
It offers a free 250-word check upfront, but full document scans are pay-per-use at $19.95 for up to 7,500 words. <\/p>\n\n\n\n
Here’s why it is a great competitor to Grammarly plagiarism checker:<\/p>\n\n\n\n
- \n
- Scribbr compares your work against restricted databases you wouldn\u2019t find in a typical web search<\/li>\n\n\n\n
- It covers English, Spanish, German, French, over 20 languages<\/li>\n\n\n\n
- Scribbr is tuned to recognize common phrases (e.g., \u201cThe results of this study show\u201d) without flagging them unnecessarily.<\/li>\n<\/ul>\n\n\n\n
CopyLeaks<\/h4>\n\n\n
\n![\"Screenshot](\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2024\/04\/Copyleaks-1024x376.jpg\")
<\/picture><\/figure><\/div>\n\n\nCopyLeaks tries to be the jack-of-all-trades plagiarism checker with both web-based and file-based scanning models.<\/p>\n\n\n\n
There’s a free limited version, but full Copyleaks access works on a pay-per-use model at $0.03 per 100 words, with a $10 minimum deposit for premium checks.<\/p>\n\n\n\n
The best thing about CopyLeaks is that it attempts to distinguish between identical, slightly altered, and paraphrased text. <\/p>\n\n\n\n
But in practice, every source is highlighted the same color, and tracking plagiarism across a paragraph means clicking sentence-by-sentence (headache-inducing, honestly). <\/p>\n\n\n\n
Its database coverage also isn\u2019t deep enough to consistently catch academic plagiarism.<\/p>\n\n\n\n
Who Should Use Grammarly\u2019s Plagiarism Checker?<\/h2>\n\n\n\n
If you\u2019re a teacher, Grammarly\u2019s plagiarism checker should be a regular part of your grading toolkit, no question about it.<\/p>\n\n\n\n
The last thing you want while grading a pile of student submissions is to waste time manually hunting for copied sections.<\/p>\n\n\n\n
Students, especially college-level and up, with heavy coursework and research projects do need to refer to other credible sources on the internet but they must not be directly plagiarized. <\/p>\n\n\n\n
Grammarly gives them a clear, fast heads-up, then they can paraphrase it fully using Undetectable AI Stealth writer.<\/p>\n\n\n\n
Writers, marketers, and SEO teams use Grammarly\u2019s plagiarism tool to make sure web content, blog posts, landing pages, and social media copy are fresh. <\/p>\n\n\n\n
And again, if they find any exact matches, running them through AI Stealth Writer<\/a> and Humanizer<\/a> will ensure the text flows like a real human wrote it. <\/p>\n\n\n
\n![\"Screenshot](\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/06\/Advanced-AI-Humanizer-1024x444.jpg\")
<\/picture><\/figure><\/div>\n\n\nTo take it even further, Humanize AI<\/a> can help smooth out stiff or overly polished AI phrasing that might still feel unnatural to a reader. <\/p>\n\n\n\n
Since educators and clients are quick to notice when something \u201csounds off,\u201d this tool makes your writing sound more authentic, conversational, and aligned with human tone\u2014especially useful for students, bloggers, or anyone aiming to pass both AI detection and the human eye test.<\/p>\n\n\n\n
Besides, vetting for originality is a critical aspect of an editor’s job. <\/p>\n\n\n\n
Grammarly Plagiarism Checker is pretty accurate, so editors and proofreaders can definitely use it and greenlight content for publication without worrying about copyright issues later.<\/p>\n\n\n\n
Final Verdict: Is Grammarly\u2019s Plagiarism Checker Worth It?<\/h2>\n\n\n\n
Our honest bottom line is that Grammarly\u2019s plagiarism checker is absolutely worth it<\/a> for most everyday users. <\/p>\n\n\n\n
At $12\/month (billed annually), you\u2019re getting one of the most accurate plagiarism checkers available at this price point, plus a:<\/p>\n\n\n\n
- \n
- Reliable grammar checker<\/li>\n\n\n\n
- Style enhancer<\/li>\n\n\n\n
- And an AI writing assistant rolled into the same package.<\/li>\n<\/ul>\n\n\n\n
It is created for the real-life, day-to-day writer, i.e., students, bloggers, marketers, authors, and busy professionals firing off client emails.<\/p>\n\n\n\n
Those who want to publish a blog post or send a work proposal do not need a PhD thesis detector. <\/p>\n\n\n\n
What they need is confidence that they\u2019re not unintentionally lifting someone else\u2019s words, and Grammarly gives you that.<\/p>\n\n\n\n
Bonus: How to Strengthen Content After Detection<\/h2>\n\n\n\n
Sometimes, even when you didn\u2019t mean to plagiarize, Grammarly Premium will flag parts of your writing as too close to existing content. <\/p>\n\n\n\n
And you don’t want to be caught off guard with a plagiarism accusation you didn\u2019t even see coming.<\/p>\n\n\n\n
So, make sure to check all your content with Grammarly plagiarism checker and run the flagged text through Undetectable AI\u2019s Stealth Writer<\/a> and Humanizer<\/a>.<\/p>\n\n\n\n
Undetectable AI completely restructures the text and rewrites it in natural human style without losing its meaning or making it sound robotic. <\/p>\n\n\n\n
You can always rely on it to stay plagiarism-free and avoid that awkward moment of having to explain \u201cI didn\u2019t mean to copy!\u201d<\/p>\n\n\n\n