Just wondering how this one affects the privacy and security because it breaks a lot of sites displaying images for example.

  • en.wikipedia.org/wiki/Canvas_fingerprinting Although the worst privacy leak is always the smartphone.
    – mootmoot
    Commented May 17, 2018 at 15:12
  • @mootmoot Seems bad enough, will have to deal with broken sites unfortunately. I did find that before, but I thought it was for something different because of the naming...
    – Jack
    Commented May 17, 2018 at 18:14
  • 1
    Yes, the blocking is nasty, but the canvas fingerprinting make worst with smartphone devices : the canvas can easily pin point smartphone model. I.e. advertiser can mark up the product price when they detect the iphoneX canvas, or malvertiser can craft phishing ads to convince the smartphone user.
    – mootmoot
    Commented May 18, 2018 at 9:51

1 Answer 1


HTML5 Client Rectangles call is one of the abuse utilised by tracker/advertiser to profile the user(AKA Cavas fingerprinting).

Though this will not identify a person, but the tracking party can map the canvas resolution against the database( check this out : Mobile Device database) carry out targeting ads, price discrimination, malicious advertisement, phishing , blackmail ads etc.

  • How is it on the PC though? As I understand, they can still detect drivers and such, so it doesn't matter if my browser window is in random resolution, etc..
    – Jack
    Commented May 18, 2018 at 17:10
  • 1
    @Jack Desktop monitors resolution are pretty generic, so it will need other fingerprint bits.
    – mootmoot
    Commented May 22, 2018 at 7:19

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