AI Studies

Does Using Grammarly Make My Content Get Detected as AI-Generated? The Results Are In

Grammarly and AI Detectors: Myth or Fact? reveals the truth and how to avoid content flags. Protect your work!

Since the inception of mainstream AI content generation back in 2022, there has been a constant clamor to find a solution to people passing this content off as their own, human-written work.

While other brands have used the term ‘AI content detection’ as a marketing ploy for a poor-at-best product, has always strived to provide the most in-depth and detailed tool possible in an attempt to bring honesty and transparency to the world of AI content generation.

However, that doesn’t mean that false positives don’t occur from time to time, which can cause significant issues for brands, writers, students, and many more.

From our discussions with users, many of these issues seem to stem from the use of tools like Grammarly, which is why we decided to put it to the test ourselves.

Short on time? Here are the key takeaways

  1. When using Grammarly for spelling or grammatical errors, the impact regarding AI content detectors is minimal.
  2. When using Grammarly’s rewrite and rephrase features, this can lead to content getting flagged as AI-generated.
  3. Wherever possible, always strive to be transparent and open about the tools you use for creating content, and save original versions for clarity if required.

Other Grammarly Articles:

Grammarly Readability Score

Grammarly Plagiarism Checker Review

Grammarly AI Writing Review

Can Grammarly Detect AI Writing

Does Using Grammarly Get Content Detected as AI Generated?

What is Grammarly?

Grammarly is a writing assistance tool that helps users improve their writing by checking for grammatical errors, punctuation mistakes, spelling errors, and style issues. 

Additionally, it provides insights into sentence structure, vocabulary usage, tone, and readability, aiming to assist writers in crafting clear and compelling content.

It’s a brilliant tool, and one that can greatly support writers in any vocation, whether it be book writing, marketing, or academia.

Grammarly also provides rephrasing suggestions, using it’s AI to identify a more common way of structuring a particular sentence, or a way that is less wordy, or one that is more suitable to your selected target audience.

What is a False Positive?

A false positive refers to a situation in which a test or evaluation incorrectly indicates the presence of something that is not actually there or incorrectly identifies a condition as being present. 

For example, you have written a piece of content entirely on your own, only to see it flagged as AI-generated when you run it through

This is an issue that some of our users were experiencing, whereby their original content would pass through Originality’s detectors with no issues, but the version that had been run through Grammarly for amends first was flagging as AI-generated.

The Test

To test this theory and identify what specific element of Grammarly could be causing the problem, we decided to do our own testing. After all, Grammarly isn’t just a spell-checker, it also offers AI-generated rephrasing suggestions and wording changes, so it’s important to identify which aspects are causing false positives to occur.

To do this, we gathered ten known human IELTS essay answers as our benchmark and ran each of those pieces of content through Originality Standard 2.0 for clarity. We then proceeded to break down our amends into two different categories:

Lightly edited: With this version of the content we only accepted Grammarly grammar suggestions, and not any rephrase or rewrite suggestions.

Heavily edited: With this version, we accepted all Grammarly insights, including rephrasing and rewriting suggestions.

You can find the data for our test here.

The Findings

grammarly use trigger ai detection

As you can see from the results, light edits resulted in almost all of the examples continuing to display as human-written, whereas the heavy edits had a significant impact on whether or not the content was flagged as AI-generated.

This makes sense when you consider that the more you rely on the AI suggested edits and phrasing changes from tools like Grammarly, the less the work reads like your original draft, and the more of it is based on AI suggestions.

While this is only a small sample size, it gives us a good indication of how much impact overly relying on these tools can have on your AI content detection score.

In Summary

So, in summary, when users of Grammarly use the "Rephrase" or "Rewrite" suggestions, it is likely to trigger AI detectors to identify the content as AI-written. If it is used for spelling, not so much. 

That is why it’s essential always to be transparent with what tools you use and maybe even save an original version of the document before using Grammarly to make any changes. That way, if any issues arise, you can provide the original document for clarity.

Jonathan Gillham

Founder / CEO of I have been involved in the SEO and Content Marketing world for over a decade. My career started with a portfolio of content sites, recently I sold 2 content marketing agencies and I am the Co-Founder of, the leading place to buy and sell content websites. Through these experiences I understand what web publishers need when it comes to verifying content is original. I am not For or Against AI content, I think it has a place in everyones content strategy. However, I believe you as the publisher should be the one making the decision on when to use AI content. Our Originality checking tool has been built with serious web publishers in mind!

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