Question

If i'm starting out with a GDN Remarketing Campaign, What are the 3 top banner sizes to make? how many size images should i make?  

Answer 1

I think you should go with responsive ones. As I remember one 1280x628 & 1080x1080.  

Comments

@fernandez32942, Does GDN autosize for me or do i have to manually make all banner sizes?  

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You just need these two sizes. It will combine them automatically. But maybe there are better ideas out there :)

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@lotti you can go for old fashioned image ads and upload your image in different dimensions, or you can use responsive ads that adjust and fit the user screen size. When you use old fashioned ads, there are 5 main dimensions that basically cover 90% of the placements, so there is no need to make images in every dimension possible. Responsive ads are like described in 2 dimensions. Landscape and square.  

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@zymosis , so with Responsive ads, All you need is 1 image and it will auto resize for all formats?  

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@lotti correct. And please do not use too much text in the image, you add text seperate while creating the campaign

Answer 2

You are VERY strongly recommended to not spend time designing placement-specific ads, because I can virtually promise you you'll get better CTR from Google's responsive ad formats. And I've observed that test being run several times consistently, including vs very impressively designed whizz bang animated placements. Furthermore if you are doing product based remarketing - it's a HUGE step up in technical requirements to add a product feed to image ads you've designed yourself (although this IS something worth looking at - Google Web Designer app will let you do this, but again VERY technical and not necessary).