Does Grammarly detect AI?
Yes, in two ways. Grammarly has a free AI detector that scores text you paste in, and its Authorship feature records how a document was written: typed, pasted, or generated with AI. Here is how each works, and whether using Grammarly itself can get your writing flagged.UpdatedGrammarly's AI detector
Grammarly's AI detector is a free web tool: paste text or upload a document and it returns a percentage estimate of how much of it reads as AI-generated. Paid plans add more detail. Like every detector of this kind it estimates from patterns in finished text, so it can be wrong in both directions, and edited or mixed drafts are where it is least certain.Grammarly's Authorship, below, works differently: it doesn't guess from the finished text, it records the writing as it happens.How Grammarly Authorship works
Authorship runs through the Grammarly browser extension in Google Docs, the Grammarly desktop app in Microsoft Word, and the Grammarly editor. As you type, it tags the origin of every chunk of text: human typing, a single paste, an AI suggestion accepted from GrammarlyGO, or AI output pasted in from a third-party tool like ChatGPT.The data produces an Authorship report the writer can export as a PDF and share with an instructor or manager.That makes it a different kind of tool from GPTZero, Turnitin or Copyleaks, which score a finished document. Authorship records the writing as it happens, so it knows when text was pasted instead of guessing from style, and the stylistic false positives that trip detectors, including on non-native English, don't apply to it.Does using Grammarly get flagged as AI?
Grammar and spelling fixes usually don't. Turnitin says that in its tests on human-written documents, corrections made by Grammarly and other grammar checkers were in most cases not flagged as AI. Text produced by Grammarly's generative features, such as drafting, paraphrasing or rewriting whole sentences, is a different matter: Turnitin says that is likely to be flagged.So accepting a comma or a spelling fix is low risk, while letting Grammarly rewrite a paragraph makes it AI-written text as far as a detector is concerned. If your school limits AI use, the same line usually applies to its policy. To see how a draft reads before you submit, paste it into Leap's free AI detector.Accuracy in practice
For pasted text, Authorship reports what happened rather than estimating it: either it recorded a paste or it didn't. That makes it reliable on that one question, and Grammarly publishes no error rate for it.The trade-off is coverage. Authorship only sees writing done while tracking is on, in places such as Google Docs, Microsoft Word or the Grammarly editor. A student who drafted somewhere else, or in Docs before switching tracking on, then pasted the draft in for a cleanup pass, produces a report that shows almost no typing, because the bulk of the writing happened before Authorship was watching. That can look suspicious to an instructor who does not understand the product.Grammarly's Authorship guide is clear on the limit: Authorship documents the writing process it tracked, and text it cannot trace to a source is labeled unknown.What to do about it
If a course or employer requires Authorship, the practical workflow is to turn it on where you write, in Google Docs, Microsoft Word or the Grammarly editor, and keep it on from the first draft forward. Pasting research quotes is fine: Authorship logs those as pasted text, and that is accurate. The pattern that raises questions is a long essay that arrives as a single paste with minimal typing after.If AI help is allowed and you want a clean Authorship report, use Grammarly's own AI suggestions instead of pasting ChatGPT output, since that text is labeled as Grammarly-assisted. How AI detectors work explains the difference between tracking the writing process and scoring finished text.To see how the finished text reads before you submit, paste it into the detector below. It runs in your browser with no sign-up and scores every sentence, so it covers what paste tracking can't see. It isn't Grammarly's or Turnitin's detector and can't predict their scores.0 words
Using this responsibly
Knowing how Grammarly tracks and scores writing helps you read a report. It doesn't change your school's rules: if AI help is banned on an assignment, getting past a detector is still a breach. Where AI help is allowed, say how you used it if your course asks you to. Treat any AI score as a signal, not proof, and never as the only basis for an accusation.Frequently asked questions
Yes. Grammarly has a free AI detector that estimates how much of a pasted text reads as AI-generated, and since 2024 its Authorship feature tracks how a document was written: typed, pasted, or generated with AI. Basic Authorship tracking is free; paid plans add detail on text copied from AI tools and websites.
It estimates from patterns in finished text, like every detector of its kind, so it can be wrong in both directions. It is least certain on edited or mixed drafts. Treat its percentage as a signal and look at which parts of the text it flags.
Spelling and grammar fixes usually don't. Turnitin says its tests found that, in most cases, corrections from Grammarly and other grammar checkers weren't flagged as AI. Text that Grammarly's generative features wrote or paraphrased is likely to be flagged.
GPTZero analyzes a finished document statistically, using signals such as perplexity and burstiness, to estimate whether AI wrote it. Grammarly Authorship is a behavior tracker. It runs while you write and logs keystrokes and paste events, so it knows whether content was typed or pasted rather than inferring it after the fact.
Often, yes. Authorship tracks pasting in Google Docs, Microsoft Word and the Grammarly editor, and with clipboard access it can tell text copied from a generative AI source such as ChatGPT apart from text copied from a website. On paid plans the report shows which text came from an AI source. It only knows what happened while tracking was on: text written with Authorship switched off leaves it no data to report.
Partly. Basic Authorship tracking is free in Google Docs and Microsoft Word, with as many reports as you need showing what you typed. The AI parts, the share of text copied from an AI source and AI detection inside the report, need a paid plan such as Grammarly Pro.
Some schools have started requiring Authorship reports with submissions as a way to prove process rather than detect output. Your instructor would tell you to install Grammarly, turn on Authorship where you write (Google Docs, Microsoft Word or the Grammarly editor), and share the Authorship report alongside the final paper.
Grammarly's AI writing assistant (GrammarlyGO) is flagged in the Authorship report as Grammarly generated. The report separates human typing, pasted text, and AI-assisted rewrites, so instructors reviewing an Authorship export can see Grammarly's own contribution distinctly.