LinkedIn Carousel Size & Specs (2026 Guide)

Here is the thing most people miss: a LinkedIn carousel is not an image post. It is a document post, and you upload it as a single PDF. Get the size and format right before you design, and the rest is easy.

What a LinkedIn carousel really is

On Instagram a carousel is a set of separate images you swipe through. On LinkedIn it is a document post: you design your slides, combine them into one multi-page PDF (one page per slide), and upload that file. LinkedIn then renders the pages as a swipeable carousel in the feed. According to Oktopost, PDF is the recommended upload format for these posts.

The recommended size

Design every slide at one of two sizes:

1080x1350 (4:5 portrait)

The portrait option. It claims more vertical space in the feed, which means a bigger tap target and more room for a hook, so it usually wins on mobile where most people scroll. Oktopost lists 1080x1350 as a recommended dimension.

1080x1080 (1:1 square)

The square option, also recommended by Oktopost. It is a safe, balanced choice and reads cleanly on both desktop and mobile, though it takes less vertical space than 4:5.

Pick one ratio and keep every page in the deck identical, so the carousel does not jump between shapes as people swipe. For a fuller breakdown across platforms, see our carousel dimensions guide.

The file limits

Two numbers to remember, both from Oktopost: the maximum file size is 100 MB, and the maximum page count is 300 pages. You will almost never hit either, and you should not try. A focused deck of roughly 5 to 12 pages holds attention far better than a 30-page wall.

Keeping text legible on mobile

Most of your audience reads on a phone, where each page is small. So design for the smallest screen: big type, few words, one idea per page. Use high contrast between text and background, keep important content away from the edges, and resist the urge to fill a page with paragraphs. If you cannot read a page at thumbnail size, it is too busy.

How to actually make one

The workflow is simple: design your slides at 1080x1350 or 1080x1080, then export the whole set as one PDF with each slide on its own page, and upload that as a document post. The format LinkedIn expects is exactly a multi-page PDF, so the export step is where most tools either help you or get in your way.

Supaslides exports LinkedIn carousels as a multi-page PDF document, one page per slide, which is exactly the format LinkedIn uses. You pick the ratio, Claude writes and lays out each slide, and you download a file that is ready to upload as a document post.