Ads sizes are always related to the devices the campaign is addressed to. If the ad will be only seen in cell phones, tablets, dektop or if it will be the case of responsive ads to be applied for all devices.
Provided responsive ads are uploaded, the maximum resolution to run the ad must be taken into account and the ad must be uploaded by using such size.
When adjusting to different screen resolutions the ad does not lose quality when reducing its size; however, there is a risk to lose quality in case of small ads 'stretching' to higher resolutions.
Standard Measures for Smartphones: 320x480
Adhesion:
320x50
It is recommended to upload a file of 640x100 to ensure the image quality in any cell phone both in vertical and horizontal position.
Banner:
300x250
320x320
Full-screen:
320x480 (portrait)
480x320 (landscape)
It is recommended to upload a file of 640x960 (portrait) / 960x640 (landscape) to ensure the image quality in any cell phone both in vertical and horizontal position.
Standard Measures for Tablets and Desktop:
Adhesion:
1024x160
It is recommended to upload a file of 2048x320 to ensure the image quality in any device.
Banner:
300x250
728x90
Full-screen:
1024X768 (portrait)
768x1024 (landscape)
It is recommended to upload a file of 2048x1536 (portrait) / 1536x2048 (landscape) to ensure the image quality in any cell phone both in vertical and horizontal position.