Web tracker can follow you for months even if you delete your cookies

Woman using computer in modern office

Web trackers can follow you without using cookies

Gary Burchell/Getty

Browser privacy settings on high? Ad blocker engaged? A difficult to evade web tracking technique could still follow your internet activity for months.

Tracking people on the internet is normally done using cookies – tiny files that websites place on your computer. These are used for security purposes, for instance detecting suspicious online banking logins, and also by advertisers to target people with ads based on their browsing habits.

But as many people have started to use online privacy tools such as ad blockers, tracking using cookies has become …