What is the best image size for a LinkedIn post?

LinkedIn's feed doesn't enforce a single fixed image size the way some platforms do — it accepts a range of dimensions and crops or letterboxes anything outside its preferred ratios. That's why picking a size isn't really about finding the one "correct" number, it's about picking a ratio LinkedIn's feed handles predictably rather than one it has to guess how to crop.

1200×1500px (4:5) has become the practical default for creators optimizing for engagement because it's the tallest ratio LinkedIn will display in-feed without adding letterboxing or forcing a crop, and taller images occupy more of the screen on mobile, where the majority of LinkedIn traffic happens. That extra screen real estate tends to slow the scroll down for a fraction of a second longer, which is often enough to earn a stop instead of a scroll-past.

1200×1200px (square) is the safer choice when you're less certain how an image will be viewed, since it displays consistently on both desktop and mobile without any risk of the top or bottom being clipped in a preview. Wider landscape images (16:9 or similar) are the weakest choice for feed posts — they take up the least vertical space on mobile and are the easiest to scroll past. Whichever ratio you pick, export at these pixel dimensions directly rather than resizing a smaller image up, since upscaling introduces visible softness that LinkedIn's own compression will make worse.

A common mistake is designing text or logos right to the edge of the frame — feed and share previews sometimes trim a small margin, so keep key elements at least 60-80px inside the border on every side. CarouseLabs applies these dimensions automatically when generating a post image, so the sizing decision doesn't require manual setup.

Key Points

• 1200×1500px (4:5 portrait) maximizes mobile screen space and scroll-stopping power
• 1200×1200px (square) is the safest default across desktop and mobile viewing
• Landscape (16:9) images take up the least feed space and are easiest to scroll past
• Export at full target resolution — don't upscale a smaller image to fit

Example

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