Guidelines for Facebook ads and videos

Image specs:

Recommended image size: 1200 x 628 pixels
Image ratio: 1.91:1
To maximize advert delivery, use an image that contains little or no overlaid text.

Video specs:

	Image Text: Ok Your ad’s image contains little or no text. This is the preferred image style.
	Image Text: Low Your ad’s reach may be slightly lower You may reach fewer people because there’s too much text in the ad image. Ad images with little or no text are preferred. Try an image with less text, a smaller font size or without text-based logos.
	Image Text: Medium Your ad’s reach may be much lower You may reach fewer people because there’s too much text in the ad image. Ad images with little or no text are preferred. Try an image with less text, a smaller font size or without text-based logos.
	Image Text: High Your ad may not run You may not reach your audience because there’s too much text in the ad image. Ad images with little or no text are preferred. Unless you qualify for an exception, try an image with less text, a smaller font size or without text-based logos.

Facebook Campaign Types.

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Reference : The above article is referred from : https://www.facebook.com/business/help/980593475366490?id=1240182842783684