extension ExtPose

Canvas Blocker - Fingerprint Protect

CRX id


Description from extension meta

Prevent HTML canvas element from generating a unique identification key to protect user's privacy

Image from store Canvas Blocker - Fingerprint Protect
Description from store This extension protects user privacy by prevents the HTML canvas element from being used by malicious scripts for fingerprinting the user. This extension adds a slight noise to the data generated by the canvas element when certain methods are being called. This way the canvas element cannot be used for fingerprinting purposes. Compared to other similar extensions, this one is lighter and uses a more effective method to block fingerprinting from all frame elements (top and subframes). The extension supports three modes of operation: 1. Random noise 2. Random noise (per session) (to have a fixed identity for current page session) 3. Fixed noise (to have a fixed but unique identity all the time) Features: 1. Fingerprint defender with as minimum footprint as possible 2. Block or disable fingerprint on certain hostnames 3. Notify when the canvas fingerprint is detected 4. Disable notification for a few hostnames or for all hostnames. 5. Works on cross-origin (CORS) and sandboxed iframes (like Disqus and Hangouts) Notes: 1. There is no on and off button as the extension is not meant to be disabled. If there is a use case of the on and off button please report on the FAQs page (review section) 2. This extension does not block the canvas element entirely. It only modifies two methods to prevent the JavaScript engine from generating a unique identification key from this element. What is Canvas Fingerprinting: Canvas fingerprinting is one of a number of browser fingerprinting techniques for tracking online users that allow websites to identify and track visitors using the HTML5 canvas element instead of browser cookies or other similar means. Canvas fingerprinting works by exploiting the HTML5 canvas element. When a user visits a page, the fingerprinting script first draws text with the font and size of its choice and adds background colors. Next, the script calls Canvas API?s ToDataURL method to get the canvas pixel data in dataURL format, which is basically a Base64 encoded representation of the binary pixel data. Finally, the script takes the hash of the text-encoded pixel data, which serves as the fingerprint.

Latest reviews

  • (2021-09-19) Евгений Расторгуев: я не могу понят разницы между двумя первыми режимами - по логике - первый должен всегда при запросе отпечатка выдавать разные при каждом запросе, второй должен сделать новый при входе на сайт и все время его выдавать при запросах, третий режим выдает оригинальный отпечаток. Так вот второй режим у меня всегда дает рандомные отпечатки, а почему? либо я не понимаю, что такое "per session"
  • (2021-08-02) Van Tung Tran: First of all, Thanks for making a great tool! But, but if you have multi profiles of Chrome and install this extension to these profiles and using "Fixed Fingerprint" mode in setting of extension, the Fingerprint code is the same on all profiles. Finally, The "Fixed Fingerprint" feature work wrong on multi profiles. Please fix this.
  • (2021-06-09) R. Y: It's an awesome extension, just please, let us be able to disable notifcations, they get really annoying.
  • (2021-05-11) Scott: Cover your tracks from EFF says your extension doesn't work.
  • (2021-03-02) tbs-mbs. net: как проверить что оно работает? Кажись вообще пользы никакой.
  • (2021-02-14) Mikhail Georgiev: Best fingerprint blocker for Chrome. Thank You!
  • (2020-11-05) M: Doesn't work against canvas !! Try on this website : 1) Open a private new tab (0 cookie then) then go on https://fingerprintjs.com/demo 2) Close the windows 3) Reopen a new private tab (0 cookie again) then rego on https://fingerprintjs.com/demo Doesnt work, website knows who you are. Try this with CanvasBlocker on Firefox, it won't recognize you. If you use Brave, you can close your browser and reopen it it will reset the hash so the website wont recognize you.
  • (2020-10-08) Joshua Jones: RE: the comment about https://browserleaks.com/canvas, if you refresh the page, you will see this extension causes the canvas to generate a unique fingerprint each time you visit the page, compared to the same fingerprint every time with the extension disabled.
  • (2020-10-01) Rainbow Warrior Princess: Best canvas blocker, and also compatble with, respectively does not block, the ebay identity check (Google recaptcha) when logging in.
  • (2020-08-15) n ascentt: According to https://browserleaks.com/canvas I am 100% unique with this addon installed.
  • (2020-07-10) Waw4303: Работает
  • (2020-04-13) Ростислав HP: Полезно
  • (2020-02-03) Clemens Ratte-Polle: fine :) But what about an option for disabling Canvas Blocker (Fingerprint Protect) on some sites?
  • (2020-01-30) ​ポール: Confirmed to work and has a whitelist - perfect! Also very light weight.
  • (2019-09-20) Cunninghams Law: The notifications are driving me nuts. How to disable?
  • (2019-08-31) Jakub Stec: This should have a one click button to turn off notifications
  • (2019-03-10) Amardeep Verma: This Fingerprint canvas blocker does not block most of the websites. For example in Firefox there is a CanvasBlocker extension which blocks canvas fingerprinting on many sites which this extension misses. Further there is no visual indicator when a website is blocked from carrying out Fingerprint blocking.
  • (2019-03-07) johnnie faire: Is it possible to disable the notifications just for this plugin? I don't want to disable notifications all out for chrome - I just don't want to see them for this
  • (2019-02-03) Mihail Kolishev: Unfortunately it breaks some websites that use the distilnetworks.com services because it blocks the getImageData javascript function. Here's my console log when trying to log into my greenmangaming.com account. https://i.imgur.com/0VMdMfg.png
  • (2019-01-28) John Quers: Works Great! I have been using it for a few months now and no problems. Nice and fast, keep providing future updates to this extension.
  • (2018-06-22) Grégory LE MESTRE: perfect. No popup option, that's great.
  • (2018-06-20) Всё работает! Оху... Отлично! Спасибо! ***** ! Это пять!
  • (2018-05-17) Joe Shmoe: To disable notifications, right-click on one of the notifications, and select "Disable notifications for [...]"


40,000 history
4.1 (29 votes)
Last update / version
2020-12-29 / 0.1.5
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