Does Microsoft Word Have An AI Detector?

Microsoft Word does not currently have a built-in detector that determines whether text was written by ChatGPT, Copilot, Claude, Gemini, or another generative AI system. As of August 10, 2026, Microsoft describes Word's native AI functionality under Copilot in Word, with capabilities such as drafting, rewriting, formatting, summarizing, and understanding documents. Microsoft Editor checks spelling, grammar, clarity, conciseness, and style, while Word's Similarity feature checks text against online sources. Neither is an AI-authorship detector. A review of Microsoft's current public Microsoft 365 roadmap also found no announced Word feature for classifying text as human-written versus AI-generated.

For readers who need AI detection without leaving Word, the third-party market is surprisingly small, and only a few tools are documented to perform AI detection inside Word itself. The strongest verified options are GPTZero, AI Detector Pro, Paperpal, and Grammarly. GPTZero and AI Detector Pro are true Microsoft Marketplace Word add-ins. Paperpal is also a Word add-in, although Microsoft describes its AI detector specifically as one-click access to Paperpal's online detector. Grammarly takes a different route: its current AI detector works in Word through Grammarly's Windows and Mac desktop integration rather than through the older Microsoft Office add-in.

• Best dedicated in-Word detector: GPTZero, because its Marketplace listing explicitly supports selecting Word text and analyzing it inside Word, and the vendor publishes comparatively detailed detection methodology and benchmarking.
• Best for academic writing workflows: Paperpal, especially for researchers who also want citations, plagiarism checking, language editing, and explicit support for Word 2019+, Microsoft 365 on Windows/Mac, and Word on the web. Be aware that the detector itself is described as an online check accessed from Word.
• Best if you already pay for a writing suite: Grammarly. Its paid AI Detector is integrated into Microsoft Word through the desktop client, but its AI-detector availability in Word Online is not explicitly documented even though Grammarly generally supports Word Online.
• Most important caveat: none of these tools can prove authorship. Grammarly explicitly says detection results should not be treated as objective truth, GPTZero says its classifier should support further inquiry rather than punishment, and AI Detector Pro disclaims any guarantee of accuracy.

Also Read: How LLMs Can Degrade Academic Papers?

What Microsoft Word does and does not detect

The terminology is easy to muddle because Word now contains a substantial amount of AI. Microsoft's official Word AI documentation identifies its generative AI experience as Copilot in Word. Copilot can draft and transform text, improve flow, change formatting, summarize documents, and help users understand material. Nothing in Microsoft's description presents Copilot as a classifier for determining whether existing prose was generated by another AI model.

Microsoft Editor is also AI-powered, but its role is proofreading and writing assistance. Its documented functions include spelling and grammar correction plus Microsoft 365 refinements such as clarity, conciseness, formality, and vocabulary suggestions. It does not report an "AI probability" or identify passages as generated by an LLM.

The other feature that is commonly confused with an AI detector is Word's Similarity checker. Microsoft says this feature compares a document with online sources and helps users identify matching material and add citations. It applies to Word for Microsoft 365 on Windows and Word for Microsoft 365 for Mac. That is a source-similarity and plagiarism-oriented workflow, not an AI-authorship classifier.

Also Read: Does Google Penalize AI Content in 2026? What Google Actually Says

Native Word question	Status as of August 10, 2026
Built-in AI-generated-text detector	None found. Microsoft's current Word AI documentation covers Copilot generation and assistance, not AI-origin classification.
Official detector feature name	Not applicable. Microsoft has not documented a Word-native feature with this purpose.
Windows availability	No Microsoft-native AI-authorship detector identified. Editor, Copilot, and Similarity are separate features.
Mac availability	No Microsoft-native AI-authorship detector identified. Similarity is documented for Word for Microsoft 365 for Mac, but it checks online-source similarity.
Word Online availability	No Microsoft-native AI-authorship detector identified.
Office or Microsoft 365 plan	Not applicable. There is no native detector to license. Microsoft 365 subscriptions can unlock other Word features such as advanced Editor functionality, but that is not AI detection.
Rollout date	No rollout announced. A review of the current Microsoft 365 roadmap found many Copilot and Word AI developments but no public roadmap item for an AI-written-text detector.

Microsoft itself publishes educational material explaining how AI detector tools look for machine-like patterns. That page discusses AI detectors as a category of tools rather than identifying such a detector as part of Word, which is consistent with the product documentation above.

One additional source of confusion is the Microsoft Store. It contains applications with names such as "AI Detector," but a Microsoft Store listing is not the same thing as a feature built by Microsoft into Word. The distinction matters when evaluating security, support, licensing, and data handling.

Also Read: [HOT] How to Cite Sources in academic work & Avoid Plagiarism?

Which AI detectors actually integrate with Word

GPTZero

GPTZero has one of the clearest Word integrations. Its Microsoft Marketplace listing says the add-in detects AI-generated text directly inside Word: users highlight text and run an analysis without first exporting the document. Microsoft's listing says the add-in can read and make changes to the document and can send data over the Internet. GPTZero's own Word extension page instructs users to install it from Word's Get Add-ins interface.

GPTZero says its detector uses deep-learning models and a sentence-by-sentence classifier that estimates whether text was produced by AI, producing both granular and document-level results. Its FAQ describes classification at document, sentence, and word level, based on a large corpus of human and AI-generated text.

Accuracy claims: GPTZero currently advertises about 99% accuracy for human-versus-AI classification, a false-positive rate under 1%, and 96.5% accuracy on mixed human/AI documents. These are vendor-reported figures and should not be interpreted as guaranteed performance on every document, language, model, or writing style. GPTZero itself says no detector is 100% accurate and that performance is stronger on longer texts and English prose.

Pricing: GPTZero currently promotes a free plan with 10,000 words per month and paid plans beginning around $12.99 per month. Exact tiers, billing periods, institutional packages, and promotional pricing can change, so the current GPTZero site should be checked before purchase.

Word platform support: the Word add-in is currently published in Microsoft Marketplace, but GPTZero's public Word documentation does not provide a precise supported-version matrix for Windows, macOS, and Word Online. Those details are therefore unspecified. This is a notable difference from Paperpal, which does publish a platform matrix.

AI Detector Pro

AI Detector Pro is another verified Microsoft Marketplace Word add-in. Microsoft lists the publisher as Westbourne International LLC, while AI Detector Pro's current site identifies the service as a product of AI Detector Pro LLC. Its add-in can scan either a full document, subject to length limits, or selected sections, highlight passages that trigger AI-detection signals, and provide rewriting suggestions.

The vendor says its detector identifies AI-generated material from historical patterns associated with GPT and related models. Unlike GPTZero, AI Detector Pro does not currently publish a simple, quantified overall accuracy percentage in its principal product documentation. Its terms explicitly say that it makes no warranty about detection accuracy and that no system can determine AI origin with 100% certainty.

Pricing: its current pricing page offers a free level with three AI scans per month. The Basic tier has been listed at a $27.98 monthly price, discounted to $13.99 with a 50% promo code, and includes 103 scans per month. An Unlimited tier is also offered. Because promotional pricing changes frequently, the current Unlimited price is best confirmed on the pricing page rather than assumed from older figures. Word and Google Docs plugins are included in the plan descriptions.

Word platform support: Microsoft confirms that this is an Office add-in, but the vendor does not publish a clear Windows/Mac/Word Online version matrix in the current Word documentation. Exact supported Word builds on each platform are therefore unspecified.

Also Read: Do AI Detectors Save Your Work? - An Independent Analysis

Paperpal

Paperpal, from academic-technology company Cactus Communications, has a broader academic-writing suite packaged as a Microsoft Word add-in. Its Microsoft Marketplace listing advertises grammar and writing assistance plus "one-click access" to an online plagiarism checker, AI detector, and journal pre-submission checks. That wording is important: the AI detector is integrated into the Word workflow, but Microsoft describes the check itself as an online detector rather than a completely local or purely task-pane analysis.

Paperpal's AI detector documentation says its model is trained on more than 100,000 human and AI scholarly samples, including material from ChatGPT, Claude, and Gemini. The system reports document-level and sentence-level indicators and uses multiple cross-checking models. Paperpal claims that this approach reduces false positives by more than 40% and provides more than 95% sensitivity to human edits. Those are specific vendor claims, not a published overall accuracy percentage.

Paperpal is unusually clear about Word compatibility. Its support matrix lists Word 2019 or later on Windows and Mac, Microsoft 365 Word on Windows and Mac, and Microsoft 365 Word on the web. It warns that Word 2016/2019 volume-license installations can sometimes be incompatible and recommends the web version or a newer Office release when that occurs.

Pricing: the Word add-in can be used with a free Paperpal account. Paperpal's AI Detector launch documentation says the free detector provides five daily scans of up to 1,200 words and that a Prime subscription removes the scan-count limit and raises the per-scan document limit to 10,000 words. Paperpal's current pricing material has advertised Prime at approximately $12 per month when billed annually, or $144 per year. Pricing and quotas can change, so the current pricing page remains the authoritative purchase reference.

Also Read: 3 AI Humanizers That Actually Work (In My Real-World Tests)

Grammarly

Grammarly is the outlier because its current AI detection is not best understood as a conventional Microsoft Marketplace add-in. Grammarly's AI Detector guide says paid users on supported plans can access AI detection inside Microsoft Word through the Grammarly for Windows and Grammarly for Mac desktop clients. Users open the Grammarly interface in Word and enter the plagiarism/AI checking workflow.

This distinction has become more important in 2026. Grammarly is retiring the old Grammarly for Microsoft Office add-in, saying it will no longer receive security, feature, or technical-support updates, while current Word functionality is delivered through its newer desktop experience. Some of Grammarly's newest help content also uses the Superhuman Go branding following Grammarly's integration into the Superhuman product family, so naming can differ between support pages during the transition.

Grammarly says its detector uses a proprietary machine-learning model trained on large collections of human and AI-generated text, analyzes smaller sections for patterns in syntax and complexity, and reports the percentage that appears AI-generated. Crucially, Grammarly tells users that the percentage should not be treated as objective truth because AI detection is prone to errors.

Pricing: AI detection is a paid feature. Grammarly Pro currently costs $30 per user per month on monthly billing, $60 per user for three months, or $144 per user per year, equivalent to $12 per month on annual billing. AI detection is documented for Pro, Plus, Grammarly Business, and Grammarly for Education plans, although plan naming and organizational packaging continue to evolve.

Word platform support: current support documentation confirms AI detection within Microsoft Word using Grammarly's Windows and Mac desktop clients. Grammarly's Windows integration supports Microsoft Office 2016 or later and Microsoft 365 installations meeting its requirements; the desktop app currently requires Windows 10 build 1903 or later, while the Mac client requires macOS 11 or later. Grammarly generally supports Word Online through its desktop application, but the AI Detector guide does not explicitly state that the detector entry point itself is available in Word Online. AI-detector support in Word Online should therefore be marked unspecified.

Also Read: [HONEST] Does Claude Watermark AI Text?

Popular tools that I did not count as Word AI-detector integrations

QuillBot is a good example of why the distinction matters. QuillBot has both a Word add-in and a web-based AI detector, but its Word documentation says the add-in currently provides the Paraphraser and Grammar Checker. Its AI Detector is a separate product. Because the vendor does not currently document AI detection as a feature of the Word add-in, QuillBot is not included in the main list.

Copyleaks can analyze Microsoft Word files and offers browser and other integrations, but I did not find a current official Microsoft Word Office add-in for its AI detector in the vendor's present integration documentation. Uploading a .docx file to a website is useful, but it is not the same thing as having an AI detector integrated into Word.

Comparison of the verified Word options

Detector	Word integration	Detection approach	Published accuracy claim	Current pricing snapshot	Word/platform support
GPTZero Vendor: GPTZero	Microsoft Marketplace task-pane add-in. Highlight text and analyze it inside Word. Plugin listing.	Deep-learning classifier with sentence-level probability analysis plus document, sentence, and word-level signals.	Vendor claims about 99% human-vs-AI accuracy, under 1% false positives, and 96.5% on mixed documents.	Free: 10,000 words/month. Paid plans currently advertised from about $12.99/month.	Microsoft Word add-in confirmed. Exact Windows/Mac/Web version matrix: unspecified.
AI Detector Pro Marketplace publisher: Westbourne International LLC	Microsoft Marketplace task-pane add-in supporting document or selected-section scans. Plugin listing.	Looks for historical patterns associated with GPT and related generative models.	No quantified overall accuracy claim found. Vendor explicitly disclaims guaranteed accuracy.	Free: 3 scans/month. Basic: $27.98/month list, currently $13.99 with published 50% promo code. Unlimited tier available.	Word add-in confirmed. Exact Windows/Mac/Web version matrix: unspecified.
Paperpal Vendor: Paperpal/Cactus Communications	Word add-in with one-click access to an online AI detector. Plugin listing.	100,000+ scholarly human/AI samples, multiple cross-checking models, document and sentence-level indicators.	No overall percentage. Vendor claims more than 40% reduction in false positives and 95%+ sensitivity to human edits.	Free Word account supported. Detector free tier: 5 daily scans, up to 1,200 words. Prime has higher/unlimited usage and has been listed at $144/year.	Word 2019+ on Windows/Mac; Microsoft 365 Word on Windows/Mac; Word on the web.
Grammarly AI Detector Vendor: Grammarly/Superhuman	Desktop integration, not the retiring legacy Office add-in. AI checking appears inside Word through Grammarly for Windows/Mac. Detector guide.	Proprietary ML model trained on human and AI text; analyzes segments for linguistic and statistical patterns.	No numeric overall accuracy percentage in the user guide. Grammarly explicitly warns results can be wrong.	Paid feature. Pro: $30 monthly, $60 quarterly, or $144 annually.	Desktop Word on Windows and Mac confirmed. Word Online generally supported by Grammarly, but detector availability there is unspecified.

The accuracy column deserves special attention. These figures are not directly comparable because vendors can use different datasets, definitions of accuracy, proportions of human and AI samples, model generations, languages, document lengths, and thresholds. GPTZero's 99% claim, for example, does not mean that any particular student essay has a 99% chance of being correctly classified. The vendors themselves repeatedly caution against treating a detector score as proof.

How to install and set up each option

Microsoft's current Office add-in guidance uses File > Get Add-ins or Home > Add-ins, followed by More Add-ins when necessary. Office add-ins declare document-access permissions in their manifests, and Microsoft notes that read/write document permission is required when an add-in uses application-specific APIs to interact with document content.

flowchart TD
A[Choose an AI detector] --> B{How does it integrate?}
B -->|Office add-in| C[Open Word Add-ins store]
C --> D[Search GPTZero, AI Detector Pro, or Paperpal]
D --> E[Review permissions]
E --> F[Add and sign in]
B -->|Desktop integration| G[Install Grammarly for Windows or Mac]
G --> H[Open Microsoft Word]
H --> I[Open AI and plagiarism check]
F --> J[Run detector]
I --> J
J --> K[Review score and highlighted passages]
K --> L[Use as one signal, not proof]

Installing GPTZero

The vendor's official Word instructions specify the core sequence: open Word, choose Insert, choose Get Add-ins, search for GPTZero, and select Add. Microsoft now also exposes installed and new add-ins through Home > Add-ins on current Microsoft 365 builds.

Windows

1. Open Microsoft Word and a document.
2. Choose Insert > Get Add-ins, or on a newer Microsoft 365 build use Home > Add-ins > More Add-ins.
3. Search for GPTZero.
4. Select Add and accept the add-in permissions.
5. Open the GPTZero task pane and sign in or begin with the available free access.
6. Highlight the text you want checked and run the detector. Microsoft describes the workflow as highlighting Word text and getting a result inside the add-in.

Mac

1. Open Word for Mac and look under Insert > Get Add-ins or the current Add-ins menu.
2. Search for GPTZero and choose Add if the listing appears.
3. Open the task pane, authenticate if requested, select text, and run the scan.

Compatibility caveat: GPTZero does not currently publish a Mac-specific Word version matrix, so exact Mac builds are unspecified. If GPTZero does not appear in your Word add-in catalog, do not assume your installation is supported merely because the product exists in Microsoft Marketplace.

Word Online

1. Open the document in Word for the web.
2. Open Add-ins or More Add-ins.
3. Search for GPTZero.
4. If it is offered for your account and tenant, add it and follow the same select-and-scan workflow.

Word Online status: explicit vendor confirmation is unspecified. Organizational Microsoft 365 administrators can also control deployment and availability of Office add-ins, so a missing listing may reflect tenant policy rather than a detector outage.

Permissions: Microsoft's Marketplace says GPTZero can read and make changes to the document and send data over the Internet. This means it should be treated as a cloud-connected document processor, not as an offline local checker.

Troubleshooting: if you close the GPTZero sidebar, the vendor says it can be reopened from the Home ribbon using Show GPTZero. If the add-in itself disappears, check Word's Add-ins/My Add-ins interface and confirm that your organization's Microsoft 365 policies permit Marketplace add-ins.

Installing AI Detector Pro

AI Detector Pro is distributed through Microsoft Marketplace and the vendor provides a Word add-on guide. Its workflow opens a task pane, prompts the user to get started and sign in to an AI Detector Pro account, and then scans either the selected portion or supported document content.

Windows

1. Open a document in Word.
2. Open Get Add-ins from Insert, File, or Home depending on the Word build.
3. Search for AI Detector Pro.
4. Select Add and review the permissions.
5. Launch the AI Detector Pro task pane from the Word ribbon.
6. Select Get Started and sign in to your AI Detector Pro account.
7. Choose whether to scan the supported document content or a selected section.
8. Review the highlighted passages. The vendor's interface distinguishes stronger and moderate AI signals and provides more detail for flagged passages.

Mac

1. In Word for Mac, open the Office Add-ins store.
2. Search for AI Detector Pro.
3. If the add-in is offered for your Word build, select Add, launch the pane, and authenticate with your AI Detector Pro account.
4. Run a selected-text or document scan.

Exact macOS and Word-for-Mac version requirements are unspecified in the vendor's current compatibility documentation.

Word Online

1. Open Word for the web and its Add-ins catalog.
2. Search for AI Detector Pro.
3. If the add-in is presented as compatible with your account, add it and sign in.
4. Run a scan from the add-in pane.

Explicit Word Online support is unspecified by the vendor, so the steps above describe the standard Office-add-in route rather than a guarantee of compatibility.

Permissions: Microsoft says AI Detector Pro can read and make changes to the current document and send information over the Internet.

Troubleshooting: if the ribbon command is missing, reopen Word's Add-ins/My Add-ins interface, confirm the add-in remains installed, restart Word, and check organizational add-in policy. Vendor-specific diagnostic instructions for Mac and Word Online are unspecified. Paid scans are also subject to size limits, so unusually long documents may need to be divided into sections.

Installing Paperpal

Paperpal has the strongest official cross-platform installation documentation of the group. Its installation guide provides both an in-Word installation route and an AppSource route.

Windows

1. Open a Word document.
2. Select Insert > Get Add-ins.
3. Search for Paperpal.
4. Select Add, then Continue.
5. Return to Word's Home tab and select Open Paperpal.
6. Sign in with your Paperpal account. Your Microsoft account email and Paperpal email do not have to match.
7. Use Paperpal's checks from the add-in. For AI detection, expect the workflow to provide access to Paperpal's online AI detector rather than assuming the entire detector runs locally within Word.

If normal Marketplace installation fails, Paperpal also publishes a separate Windows installer and uninstaller for supported Word versions.

Mac

1. Open Word 2019 or later, or Microsoft 365 Word for Mac.
2. Choose Insert > Get Add-ins.
3. Search for Paperpal and select Add and Continue.
4. Open Paperpal from the Home tab and sign in with your Paperpal account.
5. Use the detector link/check from the Paperpal workflow.

Paperpal explicitly supports Word 2019+ and Microsoft 365 Word on Mac. A standalone Mac installer is also available as a fallback if the normal installation route does not work.

Word Online

1. Open Microsoft 365 Word on the web.
2. Open the Add-ins store.
3. Search for Paperpal and add it.
4. Launch Paperpal from the Word interface.
5. Sign in with the Paperpal account whose plan you want to use.

Unlike GPTZero and AI Detector Pro, Paperpal explicitly lists Word on the web with Microsoft 365 as supported.

Permissions: the Marketplace listing states that Paperpal can read and make changes to the document and send data over the Internet. Its Word product page also tells users to grant the required permissions when installing from Microsoft AppSource.

Troubleshooting: if a paid subscription appears as free inside Word, Paperpal says to sign out of the Word add-in and sign back in using the email associated with the paid subscription. If Word cannot automatically apply a suggestion, equations, non-text objects, or Track Changes may be interfering; Paperpal recommends copying the suggested text manually or changing Track Changes markup to show revisions in balloons. If a university blocks the add-in, Paperpal explicitly advises contacting its support team for material that can be given to the institution's administrators.

Installing Grammarly's AI Detector

For Grammarly, do not start by looking for the old Grammarly for Microsoft Office add-in. Grammarly says that legacy add-in is being retired. The current approach is to install Grammarly's desktop software on Windows or Mac and let it integrate with Word.

Windows

1. Download and install Grammarly for Windows from Grammarly's official desktop distribution.
2. Sign in with an account on a plan that includes AI detection.
3. Open a Microsoft Word document.
4. Open the Grammarly widget.
5. Choose the plagiarism and AI-text check. Current support material describes the command as Check for plagiarism and AI text or a quotation-mark/plagiarism-checker entry point, depending on the client version.
6. Review the reported AI percentage and highlighted material as an indicator rather than a verdict.

Grammarly currently requires an Internet connection because the product is cloud-based. For Windows Word integration, the vendor documents Office 2016 or later and compatible Microsoft 365 installations, along with current Windows system requirements.

Mac

1. Install Grammarly for Mac rather than the discontinued dedicated Word-for-Mac add-in.
2. Follow the macOS prompts and grant the required system access. Grammarly's enterprise Mac deployment documentation specifically includes allowing Grammarly access to macOS Accessibility.
3. Sign in to a paid account that includes AI detection.
4. Open Microsoft Word.
5. Open the Grammarly panel and choose the plagiarism/AI check.

Grammarly's current documentation says its plagiarism checker and AI detector on Mac are available in Microsoft Word and Apple Pages. macOS 11 or later is listed among the current desktop system requirements.

Word Online

1. Install Grammarly for Windows or Grammarly for Mac on the computer.
2. Open Word Online in a supported browser.
3. Confirm that Grammarly's desktop integration is active for the browser and Word Online.
4. Look for the AI/plagiarism check in the Grammarly interface.

Grammarly has an official support article confirming general Word Online support through its Windows or Mac desktop product. However, its AI Detector guide specifically describes the detector as available "within Microsoft Word" through the desktop clients without separately guaranteeing the Word Online case. Therefore, the AI-detector component in Word Online remains unspecified. If the AI-check control is absent, use desktop Word or Grammarly's own web writing environment rather than assuming a configuration fault.

Permissions: Grammarly is a desktop application rather than an Office add-in manifest, so its permission model differs from GPTZero, AI Detector Pro, and Paperpal. It needs access to text in supported applications and Internet connectivity to process that text; Mac deployments can require Accessibility permission. Grammarly's privacy policy confirms that user content is processed to provide writing features.

Troubleshooting: restart the computer first if Grammarly stops appearing in Word. On Windows, confirm you are running a supported Word/Office version. Grammarly also documents cases where Word's document view affects integration, with Print Layout being safer than unsupported views, and users should check Grammarly's Block List if it has been disabled for Word. Network, VPN, firewall, or WebSocket restrictions can also interfere because Grammarly depends on its cloud service.

Permissions, privacy, and reliability concerns

The biggest conceptual limitation is that an AI detector is not a provenance system. It looks at characteristics of the final text and estimates whether those characteristics resemble patterns learned from AI-generated material. It generally does not have direct evidence that ChatGPT, Copilot, Claude, Gemini, or another model actually produced the text. Grammarly states particularly clearly that no detector can reliably and conclusively determine whether AI was used, while GPTZero describes its output as a reason to begin further inquiry rather than a basis for punishment.

This distinction becomes especially important with edited, translated, highly formal, technical, second-language, or mixed human/AI writing. A polished human document can statistically resemble model output, while heavily revised AI text can cease to resemble the patterns on which a detector was trained. Even vendors acknowledge that results can vary by text length, language, model, and amount of human editing.

• GPTZero: Microsoft says the Word add-in can read/change the document and send information over the Internet. GPTZero's FAQ says API-submitted documents are not stored, while inputs submitted through its dashboard are stored and used in aggregate to improve the service. The FAQ does not clearly map either rule to the Word add-in, so Word-specific retention is unspecified. Sensitive-document users should not assume that the API's no-storage rule automatically applies to the Word plugin.
• AI Detector Pro: Microsoft's listing gives it read/write document access and Internet-transfer capability. Its privacy policy says it processes user text, uses some third-party AI models for core functionality, and may need to share text with those model providers. The policy also contains overlapping retention language: one section says user content is automatically deleted at the beginning of the fourth month after entry, while another says documents users create are stored until users delete them or their accounts. Consequently, exact retention for a particular Word scan is not completely clear from the current policy.
• Paperpal: the Office add-in can read/change documents and send information over the Internet. Paperpal's detector page claims that detector text is processed ephemerally, encrypted end to end, never used to train its AI, and subject to zero data retention. These are vendor security and privacy representations rather than an independent audit of the detector workflow.
• Grammarly: its current privacy policy says it processes user content to provide its products and can use collected information to improve AI models subject to available training controls. Grammarly's Product Improvement and Training documentation says this setting is on by default for individual users covered by that control, but users can turn it off. Content training is automatically off by default for certain Education, Business, Pro, and Enterprise accounts purchased through Grammarly's sales organization. Grammarly says data is encrypted in transit and at rest.

For enterprises, schools, publishers, legal practices, healthcare organizations, and anyone handling unpublished research or confidential commercial information, the permission to send document text over the Internet is not a minor installation detail. It can trigger requirements under internal data-classification rules, contractual confidentiality clauses, research-data governance, or organizational data-loss-prevention policies. Microsoft's Office add-in model is designed to disclose permissions and allows administrators to centrally govern add-in deployment, but the organization still needs to evaluate each vendor's data practices.

There is also a difference between detection and authorship evidence. Grammarly now offers Authorship functionality that can track sources of text during the writing process in Word, while GPTZero promotes writing reports and replay-type evidence in addition to post-hoc detection. For a high-stakes academic-integrity or publishing decision, process evidence can be more informative than asking a classifier to infer provenance solely from finished prose.

Recommendations and bottom line

For someone who specifically wants a conventional AI detector inside Word, GPTZero is the strongest starting point. It has a dedicated Microsoft Marketplace add-in, a simple highlight-and-check workflow, relatively transparent technical descriptions, and detailed benchmarking claims. Its weakness is platform documentation: the vendor does not provide the precise Windows/Mac/Word Online compatibility matrix that an enterprise buyer would ideally want. Its 99% figure should also be read as a vendor benchmark, not as a guarantee for an individual document.

For academic researchers and students, Paperpal is arguably the better overall Word package. It explicitly supports Word 2019+ on Windows and Mac, Microsoft 365 Word, and Word on the web, and combines academic editing, research, citations, plagiarism checking, and AI detection. The tradeoff is integration depth: Microsoft's Marketplace wording describes the AI detector as an online detector reached in one click from Word, so readers seeking a pure in-pane detector should distinguish it from GPTZero. Paperpal also makes stronger privacy claims for the detector, including ephemeral processing and zero retention.

For existing Grammarly subscribers, using Grammarly is more economical than adding another tool. The detector is already part of supported paid plans and works in desktop Word on Windows and Mac. It also has the advantage of living alongside Grammarly's plagiarism and authorship tools. The key privacy step for individual users is to review the Product Improvement and Training control, because Grammarly says eligible individual accounts have training enabled by default unless the user turns it off. Word Online users should also note that while Grammarly itself supports Word Online, official documentation does not specifically guarantee the AI-detector control there.

AI Detector Pro is functional, but I would be more cautious with confidential material. The Word add-in is genuine and offers convenient whole-document or selected-section scanning, but the vendor publishes no straightforward numeric accuracy benchmark, explicitly disclaims guarantees, and its privacy policy says text can pass through third-party AI models and contains retention language that is not entirely simple to reconcile. That does not make the product unsuitable, but it raises the importance of a privacy review before deploying it to sensitive documents.

The broader conclusion is straightforward: Microsoft Word itself still does not answer the question "Was this written by AI?" Copilot generates and transforms text, Editor improves it, and Similarity checks it against online sources. Anyone who needs AI-origin classification must currently add a third-party service or move the document to an external detector. Microsoft's current product documentation and public roadmap provide no announced native detector name, eligible Office plan, platform rollout, or release date.

Whichever detector is used, the safest interpretation is probabilistic: treat a result as a prompt for review, not proof of misconduct or proof of authorship. This is not merely a conservative recommendation. GPTZero, Grammarly, and AI Detector Pro all make substantially the same point in their own current documentation.