LinkedIn carousels are PDFs, and that changes how you make them
The feature LinkedIn actually called carousels was switched off in December 2023. What creators post now is a multi-page PDF uploaded as a document — which is why Instagram carousel advice fails here.
8 minute read
A LinkedIn carousel is a document, not an album
On Instagram, a carousel is a set of images you upload one at a time. On LinkedIn it is not. What creators call a LinkedIn carousel is a document post: you upload one multi-page file, and LinkedIn renders each page as a swipeable slide inside the feed. LinkedIn's help pages accept PDF, DOC, DOCX, PPT and PPTX, and PDF is the safest of them because it fixes the layout rather than letting it reflow on someone else's device. That single mechanical difference decides almost everything downstream. Your slides are pages in a document, not images in an album, so page geometry has to be consistent across the file, and most of what you know about Instagram carousel specs transfers badly.
What LinkedIn removed, and what it left alone
LinkedIn did briefly ship something it genuinely called a carousel: a swipeable multi-image post, launched in 2022 and never available to everyone. It was switched off on 14 December 2023, and existing carousel posts went with it, with LinkedIn telling users to email content support before 11 December if they wanted a copy of their files. Document posts were never part of that removal and have run continuously since. The confusion survives because the two things share a nickname. There is a third format that also gets mistaken for both: the multi-image post, which takes up to 20 photos at 5 MB each, wants at least 552 by 276 pixels, and centre-crops anything outside a 3:1 to 4:5 aspect ratio.
The file rules LinkedIn actually publishes
The limits are a file under 100 MB, no more than 300 pages, and no more than one million words, with one document allowed per post. Two constraints catch people out at upload. A PDF whose pages are different sizes has to be fitted to a single page size first, and a layered PDF has to be flattened or merged. Video and animation inside a document will not play; LinkedIn renders those frames as static images. The rule that costs the most is that you cannot edit the document once the post is live. You can change the title and the description afterwards, but a typo on slide four means deleting the post and republishing, losing whatever engagement it had already collected.
Three hundred pages is a ceiling, not a target
The 300-page cap gets quoted as though it were an ambition. LinkedIn's own guidance points the opposite way. Its Document Ads specifications recommend keeping a document under 10 pages, while listing 300 pages or one million words as the hard maximum. That is the paid side of the product rather than organic, and worth flagging as such, but it is the only page-count recommendation LinkedIn publishes anywhere, and there is no obvious reason reading behaviour differs between a promoted document and an organic one. Tool vendors arrive at roughly the same place from a different direction, most recommending somewhere between five and fifteen slides. Take under ten as the default and go longer only when the subject genuinely demands it.
Designing slides that survive a phone screen
There is a gap here worth knowing about. LinkedIn publishes file types, size, page count and word count for documents, but no recommended slide dimension for organic posts. The closest thing is the Document Ads guide, which says vertical, horizontal and square all work and lists standard page layouts including Letter, Legal, A3, A4, B4 and B5 as acceptable. Every 1080 by 1350 or 1080 by 1080 recommendation you will read comes from a tool vendor rather than from LinkedIn. What is not in dispute is that most people meet your file on a phone. So: one idea per page, type large enough to read without pinching, generous margins so nothing important sits near an edge, and no fine print you would not put on a slide behind you in a room.
What the two large studies actually measured
Two independent datasets both put the format near the top, by different measures. Metricool's 2026 LinkedIn study, built from 673,658 posts across 63,108 accounts and comparing January to February 2025 against the same window in 2026, found carousels averaging 1,451 impressions per post against 606 for video. That is reach, not engagement. Socialinsider's 2026 benchmarks, drawn from 1.3 million posts across 16,645 business pages between January 2024 and December 2025, put native documents first on engagement rate at 7.00%, ahead of multi-image at 6.45% and video at 6.00%, and up 14% year on year. Socialinsider also reports document posts averaging 525 to 1,180 impressions depending on page size, which is a useful reality check against the reach figures people quote.
The numbers that do not trace back to anything
Search for LinkedIn carousel statistics and you hit a wall of confident figures with nothing behind them. A 6.60% carousel engagement rate is repeated across dozens of pages, none of which name a study, a sample size or a date, and it matches neither large published dataset. Some of the same pages pair it with a claim that carousels beat video by 278%, which cannot be true of numbers where video sits around 6%. Completion rates and average-slides-viewed get quoted as if LinkedIn exposed them, and it does not. Even the solid sources need a caveat: Social Media Today pointed out that documents were a small slice of Socialinsider's sample, which can flatter an average. Look for a named sample size before you plan around a number.
Building one from footage or a script you already have
The cheapest carousel is the one you do not write from scratch. If you have recorded a talk, a podcast episode or a customer call, the transcript already holds the argument. Pull one claim, three or four supporting points and a closing line, and you have your pages. Frames from the footage work well as slide backgrounds and stop the file looking like everyone else's template. The pairing that does the most work is a short native clip of you making the point and a document post that writes the same point out, published on different days, because LinkedIn's format gap is wide enough that the clip alone leaves reach unclaimed. FrameOS pulls the clips and the transcript out of one long recording in a single pass. 300 credits for 3 days · no card.
FAQ
Are LinkedIn carousels still available in 2026?
Yes, but not the feature LinkedIn called carousels. It switched off its native multi-image carousel on 14 December 2023 and removed existing carousel posts. What creators publish today are document posts: a multi-page PDF, Word file or slide deck uploaded through the document option, which LinkedIn renders as swipeable slides in the feed. That format was never removed.
How many slides should a LinkedIn carousel have?
LinkedIn allows up to 300 pages, but its own Document Ads specifications recommend keeping a document under 10 pages. Vendor guidance clusters between five and fifteen. Under ten is a sensible default. The page cap is a technical ceiling rather than a target, and a longer file mostly gives readers more opportunities to stop swiping.
What file format should I use for a LinkedIn carousel?
PDF, unless you have a specific reason not to. LinkedIn also accepts DOC, DOCX, PPT and PPTX, but a PDF fixes the layout so nothing reflows on someone else's device. Flatten any layers before exporting, and make sure every page is the same size, because LinkedIn requires documents with differently sized pages to be fitted to one page size.
Can you edit a LinkedIn carousel after posting it?
No. You can change the post's title and description, but the document itself is fixed once uploaded. Correcting a typo means deleting the post and republishing, which forfeits the engagement it had gathered. Proofread the export before it goes up, and check it on a phone rather than on the laptop you designed it on.
Sources
- Upload and share documents on LinkedIn · LinkedIn Help
- Document Ads Specifications · LinkedIn Marketing Solutions
- LinkedIn Trends: 6 Strategy Insights from Our 2026 Study · Metricool
- LinkedIn Organic Benchmarks 2026 · Socialinsider
- LinkedIn Says Past Carousel Posts Will Be Deleted Next Month · Social Media Today
Related pages
Keep reading
More LinkedIn →Social media automation: what is safe and what gets you restricted
LinkedIn's user agreement bans bots that like, comment or re-share. X bans auto-DMing new followers. Both are fine with you scheduling every post you publish. The line is sharper than it looks.
8 minute readHow to post on Bluesky, and whether it is worth your time
Bluesky caps video at three minutes and has roughly 3 million daily active users to Threads' 147 million. Small, but the discovery mechanics are genuinely different.
8 minute readHow to manage multiple social accounts without mixing them up
The hard part is not the posting. It is access control, keeping the personal account out of the brand's mouth, and getting more than one account out of a single recording.
8 minute readTurn one long video into a week of posts
300 credits for 3 days · no card
Start free