Click Trackers and 1x1’s

 Track and report impressions & clicks generated by site-served creatives, text link, email, or hard-coded creatives.
 1x1 Pixels track impressions. When the creative is served the 1x1 impression pixels serves and records an impression
 Click Trackers track clicks. When the creative is clicked the click tracker serves a click through URL and records a click

What Exactly is a 1x1 Pixel?

It’s an essentially invisible image that is 1 pixel in size. Need one? Open up Paint and shrink the canvas as small as it will go and voila!

This is the “creative” that gets served in order for DoubleClick to count an impression.

When you upload a 1x1 pixel as a standard image creative, it:

Will automatically be used to create the default ad that's assigned to all 1x1-pixel placements in your campaign.

Note that you only need to do this step once per campaign. The default ad will automatically be assigned to any new 1x1-pixel placements you create.