Sempa in many ways you can't unless you use complex tactics that still may not work. Even then, all of this is debatable on what if any options work best. The debate is often whether to look unique (but lie) or blend in (but not lie or lie the same way everyone else does). If you create something unique, ad companies are less likely to determine the profile is anything other than the unique lie, but the profile stands out and can be tracked. If you try to blend in, if there's some strange JS calculation that creates a fingerprint but isn't protected, then they have the unique you. None of the options are that good, the conventional wisdom is blend in. One option is use an ad blocker and accept that if you use the internet ad companies will track you.