What LinkedIn recommends
1584×396 pixels, as a JPG or PNG file under 8 MB.
LinkedIn’s help article on adding or changing the background photo on your profile gives these figures: a JPG or PNG file, under 8 MB, with recommended dimensions of 1584 (width) by 396 (height) pixels. It adds that how the image appears may change with the size of your browser window and screen resolution, and that the background appears behind your profile photo in the introduction section. 1584 divided by 396 is exactly 4, so the frame is 4:1. Source: LinkedIn Help, add or change the background photo on your profile. Checked against the platform’s own help page on 6 October 2026.