Does Moodle Detect AI? What Plugins, Quizzes and Logs Actually Show

Moodle does not detect AI writing by itself. Its documentation says Moodle "doesn't come with any pre-installed plagiarism prevention methods," and the AI tools added in Moodle 4.5 generate and summarise text rather than check it. An AI score appears only when your site's administrator has installed a plugin such as Turnitin, Copyleaks or Originality.ai and your teacher has turned it on for the activity you submit to.

Because each Moodle site has its own administrator and its own plugins, two Moodle courses at two institutions can run completely different checks. This guide draws on Moodle's 5.2 documentation, Moodle's source code and the plugin makers' own pages, all checked in September 2026.

What Moodle ships with: a slot for plugins, not a detector

The plagiarism prevention page in Moodle's 5.2 docs is direct about it: "Moodle doesn't come with any pre-installed plagiarism prevention methods - they need to be added by a site administrator." An administrator first ticks "Enable plagiarism plugins" under Site administration → Advanced features, then installs and configures the tools under Plugins → Plagiarism prevention, as the managing plagiarism prevention page explains.

Once a plugin is enabled, Moodle's Plagiarism API does the plumbing. It's "a core set of functions that all Moodle code can use to send user submitted content to Plagiarism Prevention systems," and "every module that allows it will have a group of settings added." The developer docs name Assignment, Forum and Workshop as the core activities that support it.

Moodle's docs list Compilatio, Turnitin, Originality, Unicheck, Ouriginal and Originality.ai as fully supported plugins, with CopyCheck, PLAGIARISMA, PlagScan and Vericite as partly supported. Copyleaks isn't on that list, but it publishes its own plugin in the Moodle plugins directory. The list tells you what can connect to Moodle. It doesn't tell you which of those tools score AI writing, so check the vendor's own page for that.

Moodle's own AI tools don't grade your authorship

Moodle added an AI subsystem in version 4.5. The AI tools page calls it "the foundation for integrating AI tools into Moodle LMS," with provider plugins for services including OpenAI, Azure AI and Ollama. Its actions are about producing and explaining content: "generating text and images via the text editor, summarising and explaining course content." Administrators manage it under Site administration → General → AI. Nothing on that page describes detecting AI writing.

Moodle HQ's AI principles focus on disclosure: "People should always know when AI is being used, and how it influences an experience." So an AI button in your course's text editor is a writing aid your administrator chose to enable. It isn't a scanner pointed at your essays.

The plugins that add AI detection

A few details from those listings and from the vendors:

• Turnitin says its plugin "is developed and maintained by Turnitin and requires a license for use." Turnitin also sells an LTI 1.3 integration, and a Turnitin product marketing manager wrote in July 2025 that "both integrations can operate in the same Moodle environment concurrently without issue" (Turnitin community). So Turnitin may sit inside an ordinary Moodle assignment or appear as a separate Turnitin activity.
• Originality.ai's listing includes "Auto scan assignment options" and a "Student view of scans."
• GPTZero works differently. Its January 2026 Moodle guide says your institution "needs to reach out to GPTZero's team," after which GPTZero "will scan all student assignments for AI and list the results for each in the file submissions column."

How your teacher switches Turnitin on, and what you'll see

Louisiana State University's Moodle help page (updated 4 December 2025) shows the teacher's side of the plugin. In the activity settings, "Enable Turnitin allows Moodle Assignments, Workshops, Forums, and Quizzes to use Turnitin services," and "Display Similarity Reports to Students gives the instructor control over students' ability to view originality reports." LSU adds that this "does not include the AI report."

Turnitin's AI writing FAQ backs that up from its side, stating that the AI indicator and report "are not visible to students"; instructors may still download the report as a PDF and pass it on. Can students see the Turnitin AI score goes through what a student-visible percentage usually is.

Moodle also gives plugins a way to warn you in advance. Its plagiarism library contains a function that "prints the student disclosure notifying that the files will be checked for plagiarism" (Moodle source on GitHub). Whether a notice actually appears depends on the plugin and your site's settings. If one does appear on your submission page, it's the clearest clue you'll get.

Language and length limits matter on Moodle

Turnitin's plugin covers forums and quizzes as well as assignments, so its limits apply to short answers too.

According to its FAQ, Turnitin's AI detection only works on "long-form English, long-form Spanish, long-form Japanese, and long-form Modern Arabic." Submit in any other language and "the indicator will show an empty/error state." It needs "at least 300 words of prose text in a long-form writing format," it only analyses "standard grammatical sentences" (not lists or bullet points), and files "must not exceed 30,000 words." A 150-word forum reply, in other words, gets no AI score from Turnitin at all.

Other plugins claim wider coverage. The Originality.ai listing says its model supports 30 languages, and the Copyleaks listing says "30+ languages." Coverage isn't the same as accuracy in your language, though. A 2023 study in the journal Patterns by Liang et al. found that GPT detectors "consistently misclassify non-native English writing samples as AI-generated": seven detectors flagged more than half of 91 human-written TOEFL essays as AI. If English is your second language, read AI detection and ESL students.

A Turnitin logo on a Moodle assignment also doesn't prove the AI indicator is on. Institutions can disable it and keep similarity checking. Curtin University announced on 4 September 2025 that from 1 January 2026, "Only the Gen-AI detection feature of Turnitin will be disabled, the regular text-matching originality checks will remain active" (Curtin).

Quizzes: Safe Exam Browser, "JavaScript security" and the logs

Moodle's quiz has Safe Exam Browser (SEB) support built in. "The quiz has built in settings to allow secure exams using the Safe Exam Browser," says the SEB page, and SEB itself is open-source software for Windows, macOS and iOS. Teachers pick a "Require the use of Safe Exam Browser" option, such as configuring it manually or using a template. SEB then removes the address and search fields, blocks switching to other applications, disables shortcuts like Alt+Tab and Print Screen, and clears the clipboard. Respondus LockDown Browser is another option; Respondus lists "Moodle 3-5" among its supported systems.

The built-in alternative is much weaker. "Full screen pop-up with some JavaScript security" opens the quiz full-screen and restricts copy and paste, but Moodle's quiz settings page admits that "it is impossible for a web site to create a browser window that cannot be minimised or moved aside," and says these options "are not fool-proof."

Neither option reads your answers for signs of AI. They limit what your device can do during the attempt.

Moodle's logs are the other record teachers can check. From Course administration → Reports → Logs, a teacher can "see what pages the student accessed, the time and date they accessed it, the IP address they came from, and their actions (view, add, update, delete)." That's a record of activity, not authorship.

What your teacher sees when a plugin flags text

• Turnitin: an AI percentage with highlighted passages, found inside the Turnitin report rather than on the Moodle page. Anything between 1% and 19% is replaced by an asterisk, which Turnitin puts down to the chance of false positives.
• Originality.ai: scan results for each submission. You see them only if the student view is switched on.
• Copyleaks: an AI and plagiarism report for each submission.
• GPTZero: results in the file submissions column, as GPTZero describes it.

Whichever tool your course uses, Turnitin's own caveat is a sensible rule: the percentage "should not be used as the sole basis for action or a definitive grading measure by instructors." There's no official pass mark either. What percentage of AI is acceptable on Turnitin shows how institutions set their own thresholds.

How to check what your Moodle course is running

1. Read the submission page. Look for a notice that your work will be checked, or a tool's name near the upload area.
2. Look after you submit. A similarity score or report link means a plugin ran. Seeing nothing doesn't prove nothing ran; "Display Similarity Reports to Students" may simply be switched off.
3. Notice where you're submitting. A separate Turnitin activity is Turnitin's LTI route. A normal Moodle assignment with a Turnitin section in its settings is the plugin.
4. Ask a precise question. "Is Turnitin's AI indicator on for this course?" gets a better answer than "Do you use AI detection?"
5. Write your drafts somewhere with a history. If you type straight into Moodle's text box, keep a working copy elsewhere first. Google Docs keeps earlier versions that anyone with edit access can browse, and you can name up to 40 of them (Google Docs help). Word keeps version history only for files saved in OneDrive or SharePoint, and a personal Microsoft account holds the last 25 versions (Microsoft support). Keep your reading notes and sources with the drafts. If a flag ever turns into a meeting, how to prove your writing is human explains what to bring.

SupWriter's AI detector can give you a quick pre-check, but it's one model's opinion, not Turnitin's. Like most detectors, it isn't a reliable judge for most languages other than English (how we test).

FAQ

Does Moodle have a built-in AI detector? No. Moodle's documentation says it has no pre-installed plagiarism prevention. AI detection comes only from plugins your site administrator installs.

Does Moodle's own AI feature check my writing? No. The AI subsystem added in version 4.5 generates text and images and summarises or explains course content. The documentation describes no detection feature.

Can students see the Turnitin AI score in Moodle? No. Turnitin hides its AI report from students, and LSU's guide notes that "Display Similarity Reports to Students" doesn't include the AI report.

Does Safe Exam Browser detect ChatGPT? No. It restricts the device during a quiz. Moodle's documentation describes restrictions, not any analysis of your answers.

Will Turnitin score my essay if it isn't in English? Only if it's in Spanish, Japanese or Modern Arabic. Essays in other languages get an empty or error state instead of an AI score.

Other LMS guides: Canvas · Google Classroom · Blackboard · D2L Brightspace · Schoology

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