A LinkedIn carousel post is a PDF uploaded as a document, with each page shown as a slide, and you can build a good one in 20 minutes if you start from a process you already explain.
LinkedIn retired its original carousel feature, so the thing people call a carousel is now a document post. You make slides in any design tool, export them as one PDF and upload it. Readers swipe through on their phone.
Data from LinkedIn business pages says this format earns more engagement than any other. This guide covers the evidence, a 20-minute method, the file checks that catch most errors and the mistakes that waste a good document. It forms part of our guide to social media marketing in the UK.
Why document posts are worth the effort
Socialinsider's 2026 benchmark found native documents average 7.00% engagement on LinkedIn business pages, against 5.20% for all formats. The study covered 1.3 million posts from 16,645 business pages between January 2024 and December 2025, and Social Media Today's report on it says document posts drove the highest engagement of any format.
xychart-beta
title "Average LinkedIn engagement rate, 2025 (Socialinsider, 1.3M posts from 16,645 business pages)"
x-axis ["All formats", "Native documents"]
y-axis "Engagement rate (%)" 0 --> 8
bar [5.2, 7.0]
Two caveats apply. The data is for company pages, not personal profiles, and documents make up a small share of posts in the sample, which can skew averages. Socialinsider is a social analytics vendor, so it has an interest in the findings.
Even so, the direction fits what you would expect. A reader who swipes through nine slides has spent time on your material, and posts that hold attention are generally good for a feed.
What makes a good document post
A good document teaches one thing, in order, in few words. It does not summarise your whole service.
The best topics are processes you already explain to customers. A checklist, a before-and-after, a "what happens at each stage" or a decision tree all work.
Pick a topic you can finish in seven to nine slides. If it needs fifteen, it is two documents.
Write for a phone. Most people will view it on a small screen, one slide at a time, with one thumb.
The 20-minute method
This is the sequence we would use. The times are targets, and the first few documents will take longer.
Minutes 0 to 3: choose the topic and the promise
Write one sentence that says what the reader will be able to do after the last slide. "Check your supplier contract in ten minutes" is a promise. "Contracts" is not.
The sentence becomes your first slide.
Minutes 3 to 6: outline the slides
Number the slides on paper or in a note. Use one point per slide and no more than about 30 words on each. A typical layout is a title slide, six to eight content slides and a closing slide with one action.
If you cannot write the point in one sentence, split it into two slides.
Minutes 6 to 15: build it in a template
Use a design tool you already know, such as Canva, PowerPoint or Google Slides. Build one title slide, one content slide and one closing slide as a template, and reuse it every time.
Use a portrait or square page size so it fills a phone screen. We use 1080 by 1350 pixels, but that is our habit, not a LinkedIn rule.
Keep text large. A reader should be able to read every word without zooming. Use dark text on a plain background and keep the same two fonts on every slide.
Minutes 15 to 18: export and check on a phone
Export as a single PDF. Open the file on your phone, not just your laptop, and swipe through. Fix anything you have to squint at.
Check the page order. If you stitch images together with a command-line tool, filenames sort alphabetically, so name them with leading zeros. One author's write-up of making LinkedIn carousels from PNG files shows the method, and zero-padded names (01, 02, 03) stop slide 10 jumping ahead of slide 2.
Minutes 18 to 20: write the post text and publish
In LinkedIn, start a post, choose the document option, upload the PDF and give it a title. Then write two or three sentences of post text.
Say what the document covers, who it is for and one point from it. Put a plain question at the end, so that the first comment is easy to write.
File checks before you upload
Check four things before each upload. The file is a PDF. The page order is correct. The text is readable on a small screen. The last slide says what to do next.
Piktochart, a design-tool vendor, lists limits of 100 MB and 300 pages for a LinkedIn document and suggests keeping to around 30 pages at most. You will not come near those limits with a nine-slide file, so check LinkedIn's current rules if you plan anything larger.
Accessibility and the post text
You cannot assume that text inside a PDF slide reaches everyone, and many people will not open the document at all. Put the main points in the post text as well, in two or three plain sentences.
Use strong contrast between text and background, and do not put key words over a photo. These are habits that help every reader, including those on a bright screen outdoors.
Mistakes that waste a good document
The first mistake is cramming. A slide with 80 words is a page of a report, and nobody reads it on a phone.
The second is a title slide that is only a brand name. Promise the reader something useful on slide one.
The third is a closing slide that sells hard. One action is enough: reply with a question, download a checklist or book a call.
The fourth is posting a document with no post text. The text above the file is what readers see in the feed before they swipe.
The fifth is making one and stopping. A single document tells you very little. Make four in a month and compare.
What to put in your first four documents
Start with processes your customers ask about. A dental practice or clinic might build "What happens at your first appointment, step by step". A retailer might build "How to check a delivery before you sign" or "How to choose between two sizes".
Both are practical and specific, and both can be built in 20 minutes because the facts already exist. Ecommerce brands and retailers usually have the most visual material to draw from.
For ideas on picking topics, see why most agency social content is invisible. To turn one conversation into several documents, see content repurposing done properly.
A worked outline
Here is a nine-slide outline for a document called "Check a supplier contract in ten minutes". It is an example of the shape, not a finished piece.
Slide one makes the promise: what the reader can do after the last slide. Slide two says who it is for and what you will not cover. Slides three to seven each cover one clause to check, with one sentence on what to look for and one on what a bad version looks like. Slide eight pulls the five checks into a single list the reader can screenshot. Slide nine says what to do next.
Notice what is missing: no history of contracts, no list of definitions and no logo wall. Every slide earns its place by helping the reader do the task.
Nine slides at 30 words each is about 270 words in total. That is shorter than most blog intros, which is why it can be built so quickly.
Getting a second use from each document
A document is a good source for other posts. Each content slide can become a short text post, and the final checklist slide can become a single image post.
Save the PDF on your website, too, and link to it from a relevant page. People who find it through search get the same value as people who swipe through it on LinkedIn.
This is how one document turns into several pieces of content without extra research, which is the core idea in content repurposing done properly.
When a document is the wrong format
Do not use a document when the point is an opinion or a short story. Those work better as text, where the first line carries the post.
Do not use one when you have no process or checklist to show. A document made of five generic claims is a poor use of a format that readers have to work to open.
Do not use one for urgent news. A text post is faster, and the news will be old before you finish the slides.
How to measure whether it worked
Look at four numbers a week after publishing: impressions, engagement rate, comments from people you want to reach, and profile views. Then check whether any enquiry or conversation mentioned the document.
Compare it with your last four plain posts, not with the industry average. Your own baseline is the fairest test.
If documents beat your other posts, make one a week. If they do not, look at the topic before you blame the format.
Next steps
Growthcart is a digital agency in Northampton. If you would like a set of branded templates and a month of documents built from your own material, talk to us.
