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Google Docs AI detector and plagiarism checker

Check AI content and plagiarism without leaving Google Docs.

Quetext’s Google Docs AI detector and plagiarism checker opens from the Extensions menu. Scan your document or a selected passage, and review results in a side panel next to your writing. The same DeepSearch™ engine trusted by over 10 million students, teachers, and professionals, now inside Google Workspace.

Install from Google Workspace Marketplace, it’s free

Prefer a browser extension? Get the Chrome extension →

Watch the walkthrough

Watch: how to add the Quetext AI detector to Google Docs

A short video from the Quetext team on installing the add-on and running your first AI and plagiarism scan in Google Docs.

Get started in under a minute

How to add the Quetext AI detector to Google Docs

  1. 01

    Open the Marketplace listing

    Go to Quetext on the Google Workspace Marketplace, or in Google Docs choose Extensions › Add-ons › Get add-ons and search “Quetext”.

  2. 02

    Install and allow access

    Click Install, choose your Google account and review the permissions Quetext needs to read the text you scan.

  3. 03

    Open Quetext in a document

    In any Google Doc, go to Extensions › Quetext, or click the Quetext icon in the right-hand side panel.

  4. 04

    Log in or sign up

    Use your existing Quetext account, or create a free one in seconds.

  5. 05

    Run the scan

    Scan the whole document or select a passage, then choose Check Plagiarism or check for AI content.

  6. 06

    Review and fix

    See flagged passages color-coded with sources side by side, and fix them right in your document.

For Google Workspace admins

Roll Quetext out to your whole school or team

Admins can install the add-on for everyone in the domain, or for selected organizational units, so teachers and staff find it ready in Google Docs.

Quetext for Education plans →
  1. Sign in to the Google Admin console with an admin account.
  2. Go to Apps › Google Workspace Marketplace apps › Apps list and click Add app › Search for apps.
  3. Search “Quetext”, open the listing and click Admin install.
  4. Choose who gets it: everyone in your organization or specific organizational units, then accept the permissions.
  5. Let users know: Quetext appears under Extensions in Google Docs. Each user signs in with their Quetext account.

Everything from Quetext, inside Google Docs

A Google Docs AI detector and plagiarism checker in one

Same engine, same database, same accuracy as the full Quetext platform. The only difference is where you start the scan.

DeepSearch™ plagiarism detection

Catches exact copies and cleverly reworded text with Contextual Analysis, Fuzzy Matching and Conditional Scoring.

Google Docs AI detection

Identify text from ChatGPT, Gemini and other LLMs with a clear AI Score, flagged alongside plagiarism results.

ColorGrade™ feedback

Exact matches, near matches, paraphrased content and AI-flagged sections, each clearly marked with sources side by side.

Grammar & citations

Grammar checking in 6 dialects of English and 11 more languages, plus MLA, APA and Chicago citations.

Under the hood

How DeepSearch™ works in Google Docs

Every scan you run in Google Docs goes through the same three-step process that powers Quetext’s full plagiarism checker and AI Content Detector.

Explore our technology →

  1. Contextual Analysis

    Looks beyond individual words to the context of phrases, catching plagiarism even when wording has been rearranged or lightly edited.

  2. Fuzzy Matching

    Flags synonym swaps, sentence restructuring and patchwork plagiarism that simpler tools miss.

  3. Conditional Scoring

    Weights each flagged passage against your overall score for a nuanced percentage, not a simple pass/fail.

Who is the Quetext Google Docs add-on for?

Teachers & professors

Review student work submitted as Google Docs and spot plagiarism and AI use in assignments.

Schools & districts

Install once from the Admin console so every teacher has Quetext ready in Docs.

Students

Check your sources, keep the work original and generate citations before you submit.

Copywriters & marketers

Audit drafts and verify submissions before they go to clients.

Researchers

Validate your sources and scan academic material before publishing.

One account. Wherever you write.

Google Docs New

AI detection and plagiarism checks inside Google Docs. Install from the Google Workspace Marketplace.

Install the add-on

Chrome

The original Quetext extension, available on the Chrome Web Store.

Get the Chrome extensionOr install from the Chrome Web Store

Firefox

Plagiarism and AI checks from the Firefox toolbar. Available on Firefox Add-ons.

Get the Firefox add-onOr install from Firefox Add-ons

Microsoft Edge

Plagiarism and AI checks from the Edge toolbar. Available on Microsoft Edge Add-ons.

Get the Edge extensionOr install from Edge Add-ons

Google Docs AI detector and plagiarism checker FAQ

Does Google Docs have a built-in plagiarism checker?

No. Google Docs doesn't include a built-in plagiarism checker or AI detector. Google Workspace for Education offers originality reports for assignments in Google Classroom, but not for documents outside Classroom. The Quetext add-on adds plagiarism and AI checks to any Google Doc.

How do I check for plagiarism in Google Docs?

Install the Quetext add-on from the Google Workspace Marketplace, open your document and choose Extensions › Quetext. Scan the full document or a selected passage and get a color-coded report in the side panel within seconds.

How do I add Quetext to Google Docs?

Open the Quetext listing on the Google Workspace Marketplace and click Install, or search “Quetext” from Extensions › Add-ons › Get add-ons in Google Docs. Approve the permissions, then log in or create a free Quetext account.

Can my school install Quetext for all teachers?

Yes. A Google Workspace admin can use Admin install in the Google Admin console to add Quetext for the whole organization or for selected organizational units. For multi-user plans, see Quetext for Education.

Is the Quetext Google Docs add-on free?

Yes. The add-on is free to install, and the free plan lets you check up to 1,000 words per feature. Paid plans unlock higher limits, bulk uploads and downloadable reports.

How do I check for AI in Google Docs?

Install the Quetext add-on, open your document and choose Extensions › Quetext, then check for AI content. Quetext's Google Docs AI detector runs alongside the plagiarism check. You get an AI Score and flagged sections for text that looks like it came from ChatGPT, Gemini or other AI models.

Do I need a Quetext account to use the add-on?

Yes. An account keeps your reports secure and lets you track them. Log in with your existing details or create a free account in seconds. Your plan and reports are the same across the add-on, browser extensions and quetext.com.

How is the add-on different from the Chrome extension?

Both use the same DeepSearch™ engine, AI detector and database. The add-on lives inside Google Docs and can scan your whole document from the side panel; the browser extensions check highlighted text on any webpage.

How accurate is the add-on compared with quetext.com?

It is just as accurate. It uses the same DeepSearch™ technology (Contextual Analysis, Fuzzy Matching and Conditional Scoring) and scans billions of web pages, over 20 million books and more than 1 million academic journals. Only the way you submit text changes.

Which languages does the Google Docs add-on support?

English (US, UK, Australia, Canada, New Zealand, South Africa) plus French, Spanish, German, Italian, Portuguese, Polish, Romanian, Dutch, Turkish, Vietnamese and Indonesian.

Write with confidence, right in Google Docs.

Add the Quetext Google Docs AI detector and plagiarism checker free in seconds. Upgrade anytime for higher limits and access to all features.

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