You can attempt to fetch a local file named ads.js or a known tracking URL. If the request fails, it's a strong indicator of a network-level blocker.
Most adblockers work by checking a website's code against blocklists (like EasyList ) for specific class names, IDs, or file names like "ads.js". If these elements are missing or their height is zero, an adblocker is active. Implementation (JavaScript)
: Add an invisible div with a class name typically found on blocklists, such as ad-box or pub_300x250 . fastest way to detect adblock
This method is virtually instantaneous and requires only a few lines of code.
: Catching DNS-level blockers (like Pi-hole) that element-hiding checks might miss. You can attempt to fetch a local file named ads
The fastest way to detect an adblocker is to use —a dummy element that mimics an advertisement—and then check if the browser has hidden or failed to load it. Core Logic
: After the page loads, use JavaScript to verify if that element has a height or is visible. javascript Use code with caution. Copied to clipboard Alternative: Network Request Bait If these elements are missing or their height
: Slightly slower than element-checking because it relies on a network timeout. Summary of Detection Methods