You open LinkedIn, see someone’s twelve-slide PDF, swipe to the end and hit save. Then you try it yourself: export a deck, attach it to a post, and get 40 impressions and three likes from coworkers. Same format, different outcome.
A LinkedIn carousel works differently from an Instagram one, and most of the damage happens before you publish: the wrong canvas size, 14-point body text, a cover slide with a company logo instead of a promise. This guide covers the format’s mechanics, a structure people finish, the post copy, and when plain text beats it. For the page people land on after a good carousel, see the separate guide to a founder’s LinkedIn profile.
How the format works in 2026
Organic LinkedIn has no native image carousel like Instagram’s. The swipeable image format launched in 2022 and was removed at the end of 2023; it survives only as an ad format in Campaign Manager. Today an organic “carousel” means a document post: you attach a file, and LinkedIn renders it in the feed as a booklet with arrows and a page counter.
What the uploader accepts:
| Parameter | Limit |
|---|---|
| Formats | PDF, PPT, PPTX, DOC, DOCX |
| File size | up to 100 MB |
| Pages | up to 300 |
| Post text | up to 3,000 characters |
| Document title | separate field at upload, shown above the file |
Upload a PDF, not a PPTX: LinkedIn converts presentations itself, and fonts and spacing drift. A PDF renders exactly as you exported it.
Two limits catch first-timers. Links inside the PDF are not clickable in LinkedIn’s viewer; they work only if someone downloads the file. And there is no per-slide analytics: LinkedIn reports impressions and reactions for the whole post, never the page where readers drop off.
Slide size and document length
The viewer shows the document in its own proportions. A 16:9 landscape slide becomes a narrow strip on a phone, the text is unreadable without zooming, and the reader keeps scrolling the feed instead of your pages.
Sizes that work:
- Square, 1080×1080. The safe choice, looks the same on desktop and mobile.
- Portrait, 1080×1350 (4:5). Takes more screen in the mobile feed and stops the scroll more reliably. It is also the Instagram carousel size, which saves work when you repurpose.
Body text from 28 pt on a 1080 px canvas, headings from 44 pt. Test: open the exported PDF on your phone zoomed out. If you have to pinch, the type is too small.
Page count: 8 to 15. Fewer than eight does not justify the format; 25 slides get finished only by people who already follow you. Checklists people save for later are the exception, as long as each page stands on its own.
One slide, one idea. If a page wants three bullet points, that is three pages.
A ten-page structure
A skeleton that works for breakdowns, checklists and case studies:
- Cover. Promise a specific outcome, not a topic. “How we cut the sales cycle from 90 to 40 days” rather than “On B2B sales.” Your name and role small at the bottom. The cover is visible in the feed before anyone opens the document, and it decides whether they swipe.
- Context. One page: who this is for and what situation they are in. The reader should recognize themselves.
- Pages 3–8: the content. Every page the same type: a step, a mistake, a principle, an example. Do not mix “3 mistakes” with “5 steps” in one document; the reader needs to know what the next page holds.
- Page 9: recap. All points in one list. People screenshot and save this page, so it has to work on its own.
- Page 10: what next. One ask. Follow, DM a specific word, grab a template from the link in the comments. One, not three.
For a case study the skeleton holds, but pages 3–8 go chronologically: starting point with numbers, what you changed, what failed, what worked, the result with numbers.
The post copy matters more than it looks
The document appears in the feed together with the post text, and the text gets read first. Without it the document looks like a marketing newsletter.
Rules for the copy:
- The first 200 characters before “see more.” Desktop truncates at roughly 210 characters, mobile earlier. That is where the hook goes: a number, a contrarian claim, or the reader’s situation. Not “Sharing a deck I made.”
- What is inside, in two or three lines. People decide whether to open the document from the text, not the cover.
- Personal context. Why you know this: how many times you did it, where you got it wrong. This separates your PDF from a rewritten article.
- No link in the post. External links lower distribution on LinkedIn; compare any ten of your posts with and without one. Put the link in the first comment or your profile.
- Three hashtags, not ten. In 2026 they barely move reach but help you show up in topic search. How hashtags behave across networks is covered in do hashtags still work.
Example copy for a document on hiring your first SaaS salespeople:
I hired eight first sales reps across three companies. Four left within six months, and every time the reason was the same, and it was not the candidate.
Put it into 11 slides: how we changed the job post, the test task and the first 30 days so that reps five, six and onward stayed.
Most useful for founders who still sell themselves and are tired of it.
Three paragraphs, one story, clear what is inside and who it is for.
Tools and publishing
The tool does not matter; exporting a PDF at the right canvas size does. Canva, Figma, Keynote and Google Slides with a custom page size all work. Build one ten-page template with your colors and fonts; the next carousel is a text swap that takes 40 minutes.
Before export: fonts embedded or outlined, file size checked, no clickable-looking links on the last page that will not fire.
Set the document title manually at upload. By default it takes the file name, and everyone has seen “Final_v3_fixed.pdf” sitting above a carousel. Write the title like a subheading: “B2B email launch checklist: 14 items.”
Schedule with LinkedIn’s built-in scheduler (the clock icon next to the Post button) on weekday mornings in your audience’s time zone; the per-network breakdown is in best time to post. Then answer comments in the first hour: readers finish the discussion under a document as often as the document itself.
When a carousel loses to plain text
- You have one idea. If the content fits in five lines, a document only adds friction: open, swipe, close. A text post with a strong first paragraph will do better.
- The content is not yours. A retold article in a pretty PDF is recognized by slide two. Carousels run on experience and numbers nobody else has.
- Your audience reads LinkedIn in a background tab. In some B2B niches skimmable text wins. Check your own last ten posts before moving everything into documents.
- You need a clickable link inside. A lead magnet with a tap-through from the document will not work. The link goes in the comments, and the document says “link in the first comment.”
- You do not have time for eight pages. A half-empty four-slide carousel looks like a format test. One strong text post beats a weak document.
One carousel, three networks
A finished 1080×1350 document becomes, unchanged, an Instagram carousel of up to 20 slides or a Telegram album of up to 10 images. Only the copy differs: a shorter caption with hashtags for Instagram, the first paragraph as the album lead for Telegram. Splitting one piece into a dozen posts is covered in detail in content repurposing.
The LinkedIn version is published by hand; Repost21 does not auto-post to that network. The Instagram, Threads, Telegram and X versions from the same PDF, though, Luna writes in your voice from the brand knowledge base and slots into the calendar’s best times. If your carousels already work, try it instead of rewriting them for every network.