What is the best aspect ratio for a LinkedIn carousel?

Aspect ratio is really a question of how much of the screen your carousel controls once someone stops scrolling. A 4:5 portrait slide fills noticeably more of a phone screen than a 1:1 square slide, which means less of the next post is visible below it — that extra visual dominance is part of why portrait carousels can feel more attention-holding on mobile, where the large majority of LinkedIn's traffic happens.

Square has a different advantage: it renders predictably everywhere. LinkedIn's document viewer sometimes handles extreme ratios inconsistently across placements — the main feed, the mobile app's document preview, and any embed or notification context can each crop or letterbox slightly differently. Square's more compact frame is less likely to run into any of that, making it the safer choice when a carousel needs to look identical across every context it might appear in.

Whichever ratio you pick, leave a margin of breathing room around text and key visual elements rather than running them to the very edge — slight cropping differences between preview surfaces are more forgiving when nothing important sits in the outer 5-10% of the frame. Switching ratios between posts is also worth avoiding purely for consistency: an audience that's used to seeing square carousels notices when a portrait one suddenly takes up more feed space, and that inconsistency can read as unpolished even if each individual post is well designed.

Neither ratio is objectively better — the tradeoff is screen dominance versus display consistency. A visually driven carousel meant to stop the scroll on mobile often benefits from 4:5; a carousel likely to get viewed on desktop or shared outside the main feed leans safer with 1:1. What matters most is picking one ratio and using it for every slide in the deck — CarouseLabs applies a single consistent ratio across all slides automatically so a carousel never ends up with mismatched sizing mid-deck.

Key Points

• 1:1 (square) and 4:5 (portrait) are the only ratios LinkedIn's document viewer reliably supports
• 4:5 portrait claims more mobile screen space, which can hold attention longer than square
• Square renders more predictably across different feed placements and preview contexts
• 9:16 or other tall ratios get letterboxed, wasting space rather than gaining it

Example

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