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Chrome Third-Party Cookie Exceptions: How to Check Which Sites Are Allowed
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A user interacting with a laptop, serving as a reference image for browsing and device configuration. Photo: Intel Free Press · Original photo and description · CC BY 2.0 · Original aspect ratio retained
Key takeaways
To see which websites bypass your general third-party cookie restrictions in Chrome, navigate directly to your Third-party cookies settings under Privacy and security.
The browser maintains a dedicated list titled Sites allowed to use third-party cookies, where both manual entries and automatic temporary allowances appear.
Auditing this menu lets you spot forgotten site exceptions, understand wildcard domain rules, and remove lingering permissions you no longer need.
1. Locating Your Third-Party Cookie Exceptions List in Chrome
Chrome allows you to block cross-site tracking cookies by default while leaving specific portals functional.
When you grant an exception to fix a broken login or an embedded payment tool, that domain gets stored in a persistent browser list.
You can review all active exceptions at any time directly through the primary settings interface.
To view this register, open Chrome on your computer, click the More menu (the three vertical dots) in the top-right corner, and select Settings.
From the left-hand sidebar, click on Privacy and security, then select the Third-party cookies tab.
Scroll down to find the section labeled Sites allowed to use third-party cookies. This panel shows every domain currently permitted to store cross-site data on your browser.
Any website not on this list will adhere strictly to your global cookie-blocking policy.
2. Understanding Why Websites Appear in Your Allowed List
Websites end up on your exception list through two primary methods: direct manual addition or temporary permission prompts.
If you manually entered an address to restore functionality for an internal portal or student hub, it stays indefinitely until you delete it.
In contrast, if you clicked the eye icon or connection indicator in your address bar to resolve a broken site, Chrome grants temporary permission.
In standard browsing mode, address bar overrides automatically place the domain on your exceptions list for exactly 90 days.
Once those 90 days elapse, the temporary grant expires automatically, restoring default blocking.
Incognito mode handles this differently: any temporary cookie exception enabled in private browsing expires immediately when the Incognito window is closed.
A desktop workstation, shown as a reference photo for managing web browser cookie settings on a PC. Photo: Mnicolois · Original photo and description · CC BY 4.0 · Original aspect ratio retained
3. How Wildcard Syntax Affects Site Scope and Subdomains
While reviewing your allowed list, you might notice specific domains prefixed by brackets and an asterisk, such as [*.]google.com.
This wildcard syntax tells Chrome to extend cookie permissions across the top domain and every single subdomain beneath it.
For example, granting access to [*.]example.com simultaneously allows drive.example.com, portal.example.com, and auth.example.com to use third-party cookies.
Entering example.com without the brackets limits permissions strictly to that standalone web address.
Be cautious when auditing wildcard entries. Broad exceptions can unintentionally grant cross-site tracking capabilities to unrelated services hosted on secondary subdomains.
Keeping entries narrow minimizes unnecessary data exposure.
4. Removing Unwanted Exceptions and Checking Site Data
Cleaning up obsolete exceptions is straightforward and does not affect your standard saved login credentials for first-party sites.
To revoke access for an allowed site, locate it in the Sites allowed to use third-party cookies list, click the trash can or Remove icon to its right, and confirm.
Revoking third-party access immediately blocks that site from embedding cross-site cookies across external web pages.
However, removing an exception does not automatically erase existing cached data or previously stored local records.
To clear already stored cookies for that specific site, head back to Privacy and security, select Third-party cookies, and click See all site data and permissions.
Search for the site by name, click the trash icon next to it, and confirm the deletion.
5. Distinguishing Between General Exceptions and Related Site Groups
Chrome also includes an optional feature called Related Website Sets under the Third-party cookies menu.
This toggle, labeled Allow related sites to see your activity in the group, works independently from your individual manual domain exceptions.
When enabled, companies can share session and authentication data between distinct domains within an officially declared corporate group, such as linking a dedicated streaming
portal to a main shopping account. This connection operates even when general third-party cookies are blocked.
If you want total separation between domains, ensure this setting is toggled off alongside auditing your manual exceptions list.
Verifying both sections guarantees that only explicitly approved domains can share cross-site state across your browsing sessions.
6. Quick Address Bar Verification for Active Tabs
You do not need to dive into Chrome Settings every time you want to verify whether the page you are currently viewing has third-party access.
Chrome places controls right beside the web address in your browser omnibox.
Look at the left side of the address bar. If cross-site cookies are blocked, you will see a blocked eye or shield symbol.
Clicking this indicator opens a pop-up detailing whether third-party cookies are allowed or blocked for that specific origin.
From this small menu, you can toggle permissions instantly.
Toggling it on grants the 90-day temporary exception without opening settings, while switching it off restores standard shielding on the spot and reloads the current page.
7. Before you start: checklist
Open Settings and select Privacy and security
Click Third-party cookies to view rules
Audit Sites allowed to use third-party cookies
Identify wildcard [*.] entries on subdomains
Delete outdated or untrusted site entries
Clear existing data under See all site data
8. Frequently asked questions
Q. Does removing a site from the exception list log me out?
Removing a third-party cookie exception does not clear your direct, first-party login cookies for that site.
However, if that site relies on an external single sign-on provider through embedded third-party cookies, you may need to authenticate again.
Q. How long do temporary cookie exceptions last in Chrome?
When you allow third-party cookies for a site via the address bar icon during normal browsing, the exception remains active for 90 days.
In Incognito mode, the temporary allowance ends as soon as you close the session.
Q. Why do some allowed sites look like [*.]domain.com?
The [*.] prefix is wildcard formatting.
It ensures that the third-party cookie permission applies to the main domain as well as any existing subdomains, such as mail, calendar, or account portals associated with that
domain.
Q. Can school or work Chromebooks block changes to this list?
Yes. If your Chrome browser or Chromebook is managed by an organization, administrators can enforce cookie policies and exceptions centrally, preventing users from altering allowed
Steps can vary by device model and app version. Check the official instructions for your setup before proceeding.
Prepared with AI assistance and checked against official documentation. Behavior may differ by environment, model, or version; verify it against the source and your setup. Photographs are illustrative reference images. Sources and licenses are provided in each caption.
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