Detects ad blockers (AdBlock, ...)

FuckAdBlock (v3.2.1)

You can detect nasty ad blockers. Online example:

(There is also a project, BlockAdBlock, with a more convenient name)

Come and see the future of FuckAdBlock: V4 Beta

Valid on

  • Google Chrome
  • Mozilla Firefox
  • Internet Explorer (8+)
  • Safari
  • Opera

Install via


Download "fuckadblock.js" and add it to your website.


bower install fuckadblock


npm install fuckadblock

Code example

// Function called if AdBlock is not detected
function adBlockNotDetected() {
    alert('AdBlock is not enabled');
// Function called if AdBlock is detected
function adBlockDetected() {
    alert('AdBlock is enabled');

// Recommended audit because AdBlock lock the file 'fuckadblock.js' 
// If the file is not called, the variable does not exist 'fuckAdBlock'
// This means that AdBlock is present
if(typeof fuckAdBlock === 'undefined') {
} else {
    // and|or
    fuckAdBlock.on(true, adBlockDetected);
    fuckAdBlock.on(false, adBlockNotDetected);
    // and|or
    fuckAdBlock.on(true, adBlockDetected).onNotDetected(adBlockNotDetected);

// Change the options
fuckAdBlock.setOption('checkOnLoad', false);
// and|or
    debug: true,
    checkOnLoad: false,
    resetOnEnd: false

Default options

// At launch, check if AdBlock is enabled
// Uses the method fuckAdBlock.check()
checkOnLoad: true

// At the end of the check, is that it removes all events added ?
resetOnEnd: true

// The number of milliseconds between each check
loopCheckTime: 50

// The number of negative checks after which there is considered that AdBlock is not enabled
// Time (ms) = 50*(5-1) = 200ms (per default)
loopMaxNumber: 5

// CSS class used by the bait caught AdBlock
baitClass: 'pub_300x250 pub_300x250m pub_728x90 text-ad textAd text_ad text_ads text-ads text-ad-links'

// CSS style used to hide the bait of the users
baitStyle: 'width: 1px !important; height: 1px !important; position: absolute !important; left: -10000px !important; top: -1000px !important;'

// Displays the debug in the console (available only from version 3.2 and more)
debug: false

Method available

// Allows to set options
// #options: string|object
// #value:   string
fuckAdBlock.setOption(options, value);

// Allows to check if AdBlock is enabled
// The parameter 'loop' allows checking without loop several times according to the value of 'loopMaxNumber'
// Example: loop=true  => time~=200ms (time varies depending on the configuration)
//          loop=false => time~=1ms
// #loop: boolean (default: true)

// Allows to manually simulate the presence of AdBlock or not
// #detected: boolean (AdBlock is detected ?)

// Allows to clear all events added via methods 'on', 'onDetected' and 'onNotDetected'

// Allows to add an event if AdBlock is detected
// #detected: boolean (true: detected, false: not detected)
// #fn:       function
fuckAdBlock.on(detected, fn);

// Similar to fuckAdBlock.on(true|false, fn)


(Available only from version 3.1 and more) By default, FuckAdBlock is instantiated automatically. To block this automatic instantiation, simply create a variable "fuckAdBlock" with a value (null, false, ...) before importing the script.

<script>var fuckAdBlock = false;</script>
<script src="./fuckadblock.js"></script>

After that, you are free to create your own instances:

fuckAdBlock = new FuckAdBlock;
// and|or
myFuckAdBlock = new FuckAdBlock({
    checkOnLoad: true,
    resetOnEnd: true