Websites use canvas drawing for tracking purposes – update




Researchers from the University of Leuven and Princeton University have discovered a new way of tracking found on websites which use is made of canvas drawings. Numerous websites use this cookie alternative. including 32 sites with .nl domain.

The technique by researchers canvas fingerprinting called . It is an invisible image drawn after the drawn pixels are analyzed through the canvas-api. Using the canvas feature of the browser On the basis of unique features of the computer, for example, the fonts installed, the time and browser information, a user can be tracked, as is the case with cookies.

The researchers found the canvas drawings on numerous websites, including YouPorn and Also on 32 websites with nl domain name is this tracking method found, including popular sites like,,,, and as reports Correspondent.

Among others, the company AddThis actively uses this tracking method. The company claims that the user data from canvas fingerprinting is used for internal review and not commitment to bring.’s Web surfing in card only Further reports AddThis users from stopping when they in their browser places a special cookie. Tracking method

It is for end users who are worried about their privacy, for example tracking cookies blocking and not log on to services like Facebook, difficult to move. Tracking via drawings on canvas Currently, the Tor browser displays a warning if a site uses canvas tracking, but regular browsers do not.
Update, 12:15: Number of names of Dutch websites with controversial tracking method added.

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