Facebook Post image should be 1200 pixels long by 630 pixels tall (1.91:1 ratio). This size is perfect for the post image everywhere (page, group, profile) on Facebook.
Also, this dimension is visible for both mobile and pc.
Facebook post image format
Facebook post image should be JPG or PNG file that weighs less than 100 kilobytes, for images with a logo or text, it might be best as a PNG file.
Why your Facebook Post image matters
Post image is necessary to get the best form of your Facebook post. It seems merely a picture, but it will help your audience read or get a better impression of your post.
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