You can remove all records that macOS’s Safari keeps of where you’ve browsed during a period of time if you wish. If your Mac and your other devices have Safari turned on in iCloud preferences, your browsing history is removed from all of them.
To use iCloud on your Mac, sign in to iCloud using your existing Apple ID, or a new one, then choose the iCloud features you wish to use.
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To manually clear history on Safari, open the web browser and choose History > Clear History. Click the pop-up menu and choose how far back you want your browsing history cleared. History will also be removed on any other devices signed into our iCloud account.
However, clearing your browsing history in Safari doesn’t clear any browsing histories kept independently by websites you visited. Choose History > Clear History, click the pop-up menu, then choose how far back you want your browsing history cleared.
When you clear your history, Safari removes all the data it saves as a result of your browsing, including the history of webpages you visited, the back and forward list for open webpages, Top Sites that aren’t marked as permanent, your frequently visited site list, recent searches, and more. So make sure you really want to remove all this data before you clear your Safari history.
But there’s more than can be done to ensure more online privacy. Some websites use third-party content providers to track you across websites so they can try and sell you their products or services. You can help prevent this by going to Safari > Preferences, click Privacy, and choose “Prevent cross-site tracking.” Unless you visit the third-party content provider, their tracking data is periodically deleted.
You can also ask websites not to track you. In Safari’s Preferences, click Privacy, and choose “Ask websites not to track me.” When you visit a website, a request is submitted not to track you, but that doesn’t necessarily mean they’ll honor your request.
Note that Apple will remove the Do Not Track feature of Safari in the next update of iOS and macOS. Apple is shifting its focus to a new Intelligent Tracking Prevention feature.
Finally, you can enable Private Browsing in Safari so the browser doesn’t save your browsing history, and it asks websites you visit not to track you. To enable this choose File > New Private Window. A window that’s using Private Browsing has a dark Smart Search field with white text.
Websites can’t modify information stored on your device, so services normally available at such sites may work differently until you turn off Private Browsing. Also, note that if you use Handoff, Private Browsing windows aren’t passed to your iOS devices or other Macs.