Just enter the website and the pixel number.
Click the button and we'll show you the location of the pixel number as a black bar on the website.
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If you are installing ads on your website, you usually need to place them "above the fold". Most ad agencies define the "fold" in terms of pixels, so just put your website and the number of pixels in to see where you need to put your ad block.
For example, FoodieBlogRoll ads must start in the first 1000 pixels on the webpage. If you leave the default example in the fields, you will see that for 2Teaspoons.com the banner ad on the right starts above the line drawn at 1000 pixels, so it's installed correctly!