Can Grammarly Be Detected As AI? Insights and Tips To Use It

For years, writers have relied on Grammarly to sharpen their prose.

However, the rise of strict AI monitoring in schools and workplaces has sparked a new concern:

Can Grammarly be detected as AI?

As the platform evolves from a simple spell-checker into a powerful generative assistant, the answer has become increasingly complex.

Knowing how to navigate these tools is essential for maintaining your credibility in 2025.

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Key Takeaways

• The most critical step in rewriting is to maintain the original core message and emotional tone, acting as a translator from complex language to clear language.

• You should apply the 7 Essential Techniques, using strategies like paraphrasing, breaking up long sentences, and prioritizing active voice to systematically boost clarity and flow.

• The goal is objectivity, not opinion. Always avoid adding personal feelings, interpretations, or detailed critiques; stick strictly to the factual content and structure.

• Never rewrite a sentence in isolation; always consider the surrounding paragraph to ensure the new sentence contributes to the overall rhythm and narrative progression.

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Can Grammarly Be Detected as AI?

The short answer is: It depends on how you use it.

Since 2009, Grammarly has used natural language processing (NLP) to offer suggestions based on pre-defined grammatical rules.

For a long time, these features were primarily reactive—they fixed what you wrote rather than creating something new.

However, with the launch of its AI Writing Assistant, Grammarly now functions similarly to ChatGPT.

If you use the tool only for spelling and basic punctuation, the risk of detection is minimal.

But if you rely on its generative features to “rewrite for clarity” or “make it more detailed,” the text may take on predictable patterns that trigger AI detectors.

Does Grammarly Count as AI?

To understand if Grammarly will flag a report, you must distinguish between its two core functions:

1. Generative and “Agentic” Capabilities

Unlike traditional Grammarly tools that merely suggest corrections and improvements, the AI Writing Assistant (formerly GrammarlyGO) can generate text autonomously based on user prompts.

• On-Demand Composition: It can “compose” entire paragraphs, draft email replies, or build outlines from scratch in seconds. Because this creates new text strings, this function is highly likely to be flagged by modern AI detection algorithms.
• Sophisticated Training: It uses transformer-based models—similar to those found in Gemini 3 and GPT-4o—trained on extensive datasets. This allows it to capture a wide range of writing styles, from technical reports to creative storytelling.

2. Collaborative User Input and Initialization

While the assistant offers generative features, it does not entirely remove the need for user input. It acts as a co-creator rather than a replacement.

• Hybrid Authorship: This “middle ground” of writing is the most common in 2025. You provide the ideas and the initial outline, and the AI handles the linguistic heavy lifting.
• The “Paraphraser” Mode: You can write a rough draft, and the AI will act as an advanced paraphraser—adding detail, complexity, and specialized vocabulary to your original thoughts.

3. Advanced Context-Aware Generation

In 2025, Grammarly’s AI is more than just tone-aware; it is context-smart. It “reads” the document environment to ensure consistency.

• Situational Intelligence: It recognizes the difference between a LinkedIn post and a legal brief, adjusting its complexity and “burstiness” accordingly.
• Tone Mimicry: If you are working on a formal business report, the generated content will reflect that specific professional tone without you having to ask. It analyzes your existing sentences to ensure the new AI-generated text blends in seamlessly with your unique voice.

4. Underlying Technology and Ethical Agency

Grammarly utilizes sophisticated attention mechanisms to understand and generate human-like text by predicting the next word in a sequence.

• Strategic Oversight: The platform is designed to make sure the writer remains at the helm. By using AI as a tool to enhance productivity rather than a “ghostwriter,” you can leverage the tech without losing your personal integrity.
• The “Human-in-the-Loop” Philosophy: Grammarly places a significant emphasis on ethical use and transparency. According to Responsible AI Principles, users retain full agency over every suggestion. You can review, modify, or discard AI inputs at any time.

Grammar Checker vs. AI Writing

Subtle edits for correctness rarely change the substance of a paragraph.

However, when you ask Grammarly to “make it more detailed,” it often adds supportive arguments and specific explanations that it “thinks” fit the context.

Recent linguistic research suggests that while light edits for grammar remain undetected, “heavy” edits—where the AI restructures the majority of your sentences—result in a much higher probability of being flagged.

If your text has been flagged after undergoing heavy structural changes, you can use Undetectable AI’s AI Essay Rewriter to help you rephrase content into completely undetectable writing.

This tool breaks down the robotic uniformity often left behind by “clarity” edits, restoring the natural “burstiness” and variety that academic detectors look for.

This is because the AI often imposes a uniform, polished structure that lacks the natural variety and “burstiness” found in human prose.

We’ve discussed the technical details of Grammarly’s grammar checker and its new AI writing assistant, but let’s dive a little deeper into how they work.

The grammar checker suggests spelling, phrasing, grammar, punctuation, sentences, capitalization, and other small features that improve writing.

It uses a rule-based system and Whitelists/Blacklists for suggestions. If a word wasn’t in the possible inputs white list—it raises an error message with suggested options.

On the other hand, the writing assistant will create content based on a prompt.

Say you want a paragraph or a sentence to sound more aggressive, then it’ll paraphrase it for you. Sound basic? Think again.

When you ask Grammarly to convert a text into more detailed content, it’ll add more information to your text. Let’s give it a try.

These excerpts are from an IELTS Scientific Research Essay. A paragraph was copied and followed Grammarly’s suggestion:

As you can see from the snippet above, the original text requires a bit of editing. Grammarly suggested rephrasing it for correctness and tone. Here’s the edited output:

The changes were very subtle, and they didn’t change the substance of the paragraph. Now let’s try using it’s writing assistant.

The same original text was put through one of Grammarly’s pre-created prompts (“Make it more detailed”).

It didn’t change the context of the paragraph, but it added more details to support the argument.

It explained further why governments are best positioned to fund and oversee research.

So, how does this affect AI content detection? Will it be flagged? Subtle edits using Grammarly have a low risk of being flagged as AI-generated.

But when used to generate additional content, it will potentially marked as AI.

So, how do you prevent this? How can you enjoy Grammarly’s full features without getting flagged?

Tips and Strategies for Using AI Tools Without Getting Flagged

How do you “de-roboticize” your content? If you have used a tool to help you write, you must add human elements back into the draft to maintain your unique voice and pass detection.

Customize and Personalize AI Content

The best way to pass as human is to act like one. Add real-life stories and personal anecdotes to your work. Use first-person “I” phrases to describe likes, dislikes, and unique recommendations.

Pros and cons lists, personal charts, and custom graphs all help express a take that a machine cannot replicate.

Employ Undetectable AI Humanizer Tool

If you have used an AI tool for a first draft, consider using an AI Humanizer. These tools work by analyzing text patterns and applying natural language variations.

They add the subtle quirks—like conversational transitions and varied sentence lengths—that make writing feel authentic.

Review and Proofread Thoroughly

Proofreading is your final defense. While Grammarly is great for catching errors, a final human read-through ensures the pacing is natural.

• Watch Sentence Length: Aim for a mix of short, punchy sentences and longer, descriptive ones.
• Use Active Voice: Active voice sounds more direct and less robotic than passive constructions.
• Limit “Filler” Suggestions: Do not feel obligated to accept every Grammarly suggestion; sometimes your original phrasing has more soul.

Find out how human your text sounds with our AI Detector and Humanizer below!

FAQ’s

Conclusion

Grammarly has evolved from a simple spell-checker into a robust AI writing partner. While its basic corrections are safe, its generative features can lead to detection if used too heavily.

By integrating Undetectable AI into your workflow, you can humanize AI-generated text and reduce the risk of being flagged as machine-written.

By combining these tools, you are not just hiding AI involvement; you are actively reclaiming your creative agency and ensuring your work possesses the “burstiness” and emotional resonance that only a human mind can provide.

Ultimately, this hybrid approach allows you to leverage the speed of modern technology while keeping your unique, authentic voice at the forefront of every document.