Thumbnail general rules

Every advertising unit consists of a title and a thumbnail image.

An ad unit is a coherent medium which sells or promotes a product, service or idea.

Together bold visuals and strong titles drive better customer engagement & increase click through rates (CTR).


On the other hand, a misleading or unclear message of an ad unit may worsen user satisfaction & increase the bounce rate of a website.


Therefore, every ad unit should target its audience and give users a clear understanding of what is on the landing page.


The thumbnail image is the key element to an ad unit as it draws the user’s eye and keeps their attention. However, make sure that the advertised content is tailored to the product/service you promote.


We suggest trying different combinations of thumbnails and titles. A/B testing is a perfect solution to understanding what works best.


Image Specifications


Image size: a minimum of 492 x 328 pixels

Image format:  png, jpg, or static gif (no animated gifs)

Maximum image size: 5 MB

DPI:  at least 72 (300 is preferable)

Image crop: rectangle & square


All thumbnails must comply with the following policies:


Restricted Content, Products and Services

Prohibited Content, Products and Services

Prohibited Campaign Practices


7 Rules to a Perfect Thumbnail



1. High vs low resolution

2. Creative vs amateurish photo editing

3. Image fills size parameters (no space around image)

4. Neat vs poor framing

5. Quality image vs stretched image

6. Elements which blend into image naturally vs excessive & annoying elements

7. Stock images/images free for commercial use/purchased images vs watermarked images used without permission (violating copyright laws)


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