Once you have enabled "Gemini in Chrome" for the first time, opening Gemini shares the contents of your current tab by default. You can ask questions about a long article without copying and pasting it, but what Gemini actually receives depends on the page you have open and your sharing settings. Google explains that the page content Gemini uses may include information that is not visible to you on screen.
There is a setting to stop sharing, but tab sharing, chat saving, and use of data for AI model training are each handled separately. It is important to understand the difference between what you can see on screen and what Gemini actually processes, and to share only what you need.
When is the current tab shared?
According to Google's usage guide, the first time you use Gemini in Chrome you need to follow the on-screen instructions to enable the feature. After that, opening Gemini shares your current tab by default. The Gemini button appearing in Chrome and having enabled the feature and be sharing page content are two separate things.
This sharing also applies when you start a new chat. Even if you removed tab sharing in a previous conversation, if the default sharing setting is on, the tab you have open at that moment is shared again in the new conversation. The same action of "asking Gemini" passes different information depending on whether you are reading a public article or have just opened a work document.
You can also choose to add other open tabs. In addition, Google's guide says that new tabs opened from the chat or from a shared tab may also be shared with Gemini. This makes it convenient to compare multiple pages, but opening a reference link can also widen what is shared. You cannot assume that only the tabs open when the conversation started are involved.
Google announced the launch of Gemini in Chrome in Japan in an announcement on April 21, 2026. Current consumer guidance also lists Japan and Japanese, but the rollout is happening in stages. On computers, Chromebook Plus, Mac, and Windows are supported, and you need the latest version of Chrome and to be signed in to a Google account. It is not available in Incognito mode.
So even if you do not see the setting in your own Chrome, that does not mean it has reached all users at the same time.
Only what is visible on screen is not necessarily what is shared
Google's privacy explanation says Gemini in Chrome collects and processes the page content and URLs of the current tab and of any additional tabs the user chooses to share. This may include page information that is not visible to you on screen.
In other words, it is not accurate to think that Gemini is given only a cropped version of what is displayed.
Google Docs are handled differently again. To answer questions about shared Google Workspace pages, Gemini may access your Workspace account directly. Google explains that, with this mechanism, Gemini may be able to refer to the whole document you are asking about, not just the information currently displayed in the tab.
Even if only part of a document is on screen, that displayed portion is not necessarily the only material for the answer.
How things are recorded also does not exactly match what was shared. When "Save activity" is on, information such as the websites you visited while using Gemini is saved to your Gemini Apps activity. Page content itself is temporarily recorded in your Google account but does not appear in the activity list.
So the fact that page text does not appear in the activity list does not mean the content was not processed by Gemini.
For Chrome browsing history, handling differs depending on the feature you use. Google says that if you use the feature that has Gemini find pages you visited in the past, the URLs of relevant browsing history entries are also collected.
However, this does not mean your entire browsing history is always sent just because you used ordinary tab sharing. The page content being shared and the history URLs used to search past pages come from different features and need to be checked separately.
Also, the Chrome-related explanation does not give a specific retention period for the temporarily recorded page content. The 72-hour conversation retention period discussed below cannot simply be treated as the retention period for page content.
Stop sharing now and sharing from the next chat separately
To stop sharing a specific tab in the current conversation, display the shared tabs near Gemini's input field and remove the tab in question. Once you remove it, the glowing underline that appeared on the tab also disappears.
However, even if you stop sharing in the current conversation, the setting that automatically shares the current tab in new conversations remains. To stop automatic sharing from the next chat onward, you need to change a setting on the Chrome side.
- Open "Settings" from the Chrome menu.
- Open "Gemini in Chrome" under "AI innovations."
- Turn off "Share current tab by default" under "Permissions."
Even with this setting off, you can still add the tabs you need manually. For example, you can share a page only when you want to summarize a public article, and not share any tab when asking questions that do not need page content.
Stopping tab sharing, default sharing in new chats, and saving conversations or using them for training are managed by separate settings. The following summarizes, by what each setting affects, the Chrome usage guide and data handling as of October 7, 2026. It applies to the personal desktop version.
| What you want to do | Where to do it | What to keep distinct afterward |
|---|---|---|
| Stop sharing a specific tab in the current conversation | Remove it from Gemini's shared tab list | Separate from default sharing in new chats and from deleting data already shared |
| Stop automatic sharing in new chats | Turn off "Share current tab by default" in Chrome | You can still share tabs you need manually |
| Limit saving and training use of future conversations | Turn off "Save activity" in the Gemini app | 72-hour retention of conversations, processing for responses and safety, and handling of feedback remain |
| Hide the Gemini button from the screen | Chrome's Gemini display settings or unpinning | Showing the button is separate from tab sharing and conversation saving settings |
This difference matters especially when you move back and forth between work pages and public articles. Simply removing the Gemini button from the screen does not tell you what your tab sharing setting is.
On the other hand, if you turn off default tab sharing and manually add only the public pages needed for an answer, you can keep the convenience while choosing what information Gemini receives.
What remains even with saving off, and how work accounts differ
For personal text conversations, when "Save activity" is on, Google uses conversations and other data to improve its services and train generative AI models. The normal automatic deletion period for activity is 18 months, which users can change themselves.
However, conversations that have been reviewed by human reviewers and disconnected from the account may be retained for up to three years. Even if a user deletes their activity, records that have already been disassociated from the account are not deleted at the same time.
Google says that if you turn off "Save activity" and do not submit feedback, your future chats will not be used to train AI models. Even so, conversations are retained in your account for 72 hours and used for providing responses, protecting the service, and similar purposes.
In addition, if you submit feedback, the related conversation and the content it contains may be used to improve the service.
Google also explains that Gemini settings do not apply to some chat processing used to create anonymized data for service improvement. For processing aimed at ensuring safety and similar purposes, human review may take place even with "Save activity" turned off.
In other words, turning off "Save activity" does not stop all data processing by Google. You need to decide before sharing whether it is acceptable to give confidential information to Gemini.
Work and school accounts are subject to different conditions from personal accounts. According to the Workspace privacy explanation, when used under an eligible Workspace subscription, URLs and page content shared from Chrome are also collected and processed, but they are not subject to human review or used to train generative AI models outside your organization's domain without permission.
On regional and language support for organizations, Chrome's enterprise and education guide also includes Japan and Japanese in its list of supported ones. On computers, in addition to conditions such as being 18 or older, both the Gemini app admin setting and Chrome's "GeminiSettings" must be enabled.
On the other hand, administrator guidance for the Gemini app in general sometimes lists conditions such as signing in from the US and English (US), so the official documentation is not always consistent. Japan being on a list of supported regions and your organization actually being able to use the feature should be checked separately.
Also, simply signing in with a work email address does not necessarily mean Workspace data protections apply automatically. Google's administrator guide distinguishes between using Gemini as a Workspace core service and using it as an additional service.
When it is used as an additional service and "Save activity" is on, conversations and other data may be used to improve Google's services and machine learning technologies. It is therefore necessary to check which subscription your organization uses and what settings administrators have applied.
Administrators can also use Chrome Enterprise's "GeminiSettings" to disable only Gemini in Chrome while leaving access to the web and mobile versions of Gemini.
This means management is possible not only as a choice between fully allowing or banning AI use, but at the level of whether information open in the browser may be handed to an AI conversation as is.
Will you use it to compare public pages, or to handle internal documents? Deciding the purpose first, and then combining a suitable tab sharing setting with contractual data protections, is a concrete condition for using in-browser AI safely.