What cookies and Incognito can—and can’t—change

A cookie is browser storage with a purpose

Cookies are small pieces of data used by websites, including for sign-in, preferences, and advertising. Chrome distinguishes first-party cookies associated with the site you visit from third-party cookies associated with other sites. The term describes where a cookie comes from, not whether every use of it has the same privacy impact.

Avoid making ‘delete cookies’ your only plan without identifying your goal. Wanting to sign out of a shop, limit cross-site storage, remove a saved search history, and change an ad preference are four different tasks. A useful first step is writing down which of those you want to accomplish.

Source: Google: Delete, allow, and manage cookies in Chrome

Incognito changes the local session

Chrome says Incognito does not retain the session’s browsing history, cookies, and site data after all Incognito windows close. It temporarily uses site data while the session is open. Websites you visit can still observe activity, and signing into an account still identifies you to that service. Downloads and bookmarks can remain on the device.

That makes Incognito useful for some local privacy goals, such as avoiding leaving a normal browsing-history entry on a shared browser. It is not an invisibility switch. Judge it against the local record you want to limit, instead of expecting it to erase information held by a service you sign into.

Source: Google: Browse in Incognito mode

Third-party cookie controls have a narrower job

Chrome blocks third-party cookies in Incognito by default and offers third-party cookie settings in Privacy and security. Site exceptions can change the outcome. Blocking these cookies can affect embedded features and sign-in flows, so read the scope before adding an exception to make a site work.

Inspect a specific exception rather than switching every protection off when troubleshooting. Record what you changed, try the intended feature, and revisit the exception afterward. This gives you a clear, reversible way to investigate a broken page without losing track of the privacy preference you wanted.

Source: Google: Delete, allow, and manage cookies in Chrome

Advertising uses more than browser cookies

Google explains that sites using its services may share a page URL and IP address. It also describes advertising technologies outside browser cookies, including mobile advertising identifiers. A cookie change therefore should not be interpreted as shutting off every possible advertising signal.

An ad that fits your current page can remain relevant without a record of earlier pages. Likewise, a general-area ad does not prove a cookie survived deletion. Consider the current context before treating an ad as a measurement of browser storage. The ad image cannot report back which browser settings are working.

Sources: Google: How Google uses information from sites or apps that use our services; Google: Advertising: Google Privacy & Terms

Match the action to the layer

Use browser controls for browser data, platform controls for advertising preferences, and account-data controls for saved activity. Read deletion prompts carefully because local sign-ins and preferences may be affected. Keeping these tasks separate makes the result easier to verify.

You can use our guided explainer without uploading browsing history or authorizing account access. It works from the reasons you choose from the platform’s explanation, not by testing or fingerprinting your browser.

• For a private local session, understand when it ends and close every Incognito window when finished.
• For third-party cookie restrictions, inspect browser settings and any exceptions.
• For a personalization preference, open the provider’s ad controls in the intended account.
• For stored account history, use that account’s activity and deletion controls; a browser-data deletion is not confirmation of account deletion.