The short answer: a LinkedIn carousel is a document post — you upload a PDF, and LinkedIn renders each page as a swipeable slide. Build your pages at 1080 × 1350 px (4:5 portrait) or 1080 × 1080 square, keep it to 8–12 slides, and stay under the 100 MB / 300-page limits (which you should never get close to).

Here’s everything that matters.

LinkedIn carousel specs at a glance

Spec	Value	Notes
Format	PDF upload (document post)	Images/PNGs must be combined into a PDF first
Page size (recommended)	1080 × 1350 px (4:5)	Tallest allowed presence in feed
Also works	1080 × 1080 (1:1), A4	Square is the classic; A4 reads like a report
Max file size	100 MB	Keep under ~10 MB for fast loading
Max pages	300	Engagement data says stop at 8–12
Title	Required at upload	Acts as the document’s headline — keyword it

Two quirks worth knowing:

LinkedIn flattens your PDF to images. Embedded links inside slides are not clickable — put your call to action in the post text, not on the last slide alone.
The first page is the ad for the rest. LinkedIn shows page one with a “swipe” affordance; if it looks like a cover slide with one bold claim, expansion rates go up sharply.

How to post a carousel on LinkedIn

Design your slides at 1080 × 1350 (same rules as an Instagram carousel — one idea per slide, readable at arm’s length).
Export as a single PDF — every design tool does this natively.
Start a post → click the document icon (the page symbol) → upload the PDF.
Add a document title (this is indexed — use your keyword, not “Untitled”).
Write the post text with your hook and CTA, then publish.

Why carousels outperform on LinkedIn

LinkedIn’s feed ranks heavily on dwell time — how long people spend on your post. A carousel that takes 30–60 seconds to swipe through generates more dwell than almost any other format, which is why document posts routinely earn several times the reach of a text-plus-image post from the same account.

The structure that earns those swipes is the same everywhere: a hook page, a promise page, one idea per page, and an explicit ask at the end. We broke the full skeleton down in the Instagram carousel guide — it transfers to LinkedIn wholesale.

The compounding problem

One LinkedIn carousel takes an hour. The accounts that grow post them 2–5 times a week — and that’s where the pipeline breaks, because slide design is the slowest part of the whole workflow.

That’s the job CarouselMaker automates: it writes and designs a carousel a day from one brief and publishes to LinkedIn automatically. See how Autopilot works →