Recommended: 400 x 400 pixels or larger (recommended)
10MB maximum
Tip: LinkedIn can accommodate large profile photo files (anything up to 8MB) so upload as large as you can to future-proof.
Recommended: 1584 x 396 pixels
4MB maximum
Cover photo size: 1536 x 768 pixels
Company logo size: 300 x 300 pixels
Overview tab image size: 360 x 120 pixels
Overview tab cover image size: 1192 x 220 pixels
Life tab hero image size: 1128 x 376 pixels
Life tab custom modules image size: 502 x 282 pixels
Life tab company photos image sizes: 900 x 600 pixels
Square logo: 60 x 60 pixels
Tip: When posting image updates to your company page, make sure to use .PNG or .JPG images and an aspect ratio of 1.91:1 (1200 x 627 pixel images are ideal).
Desktop: 1200 x 1200 pixels (recommended)
Mobile: 1200 x 628 pixels tall
Recommended: 1200 x 627 pixels (recommended)
Tips:
When pasting a URL into an update, an auto-generated thumbnail image may appear in the preview if one is available, along with the article or website title. But, you can customize it by clicking the Image icon below the text box and selecting an image from your computer.
The image should be 1200 x 627 pixels
Be at least more than 200 pixels in width
If the image width is less than 200 pixels, it will appear as a thumbnail on the left side of the post
Company logo size for ads: 100 x 100 pixels
Spotlight ads logo size: 100 x 100 pixels
Spotlight ads custom background image: 300 x 250 pixels
Sponsored content images: 1200 x 627 pixels
Recommended: 256 x 144 (minimum) to 4096 x 2304 (maximum)
https://docs.google.com/presentation/d/1o3lD7_47HQqZV7p5uPIleA7RUtSBw6TZXUnPtM2Qt8I/template/preview