The LinkedIn carousel is the format most amplified by the algorithm — as long as you get the technical specs right. Here is everything you need to know before you create yours.
In short
→ 1 to 15 slides recommended (LinkedIn accepts up to 300 pages, but performance drops past 15) → Optimal dimensions: 1080×1350 px (portrait 4:5 — the most visible on mobile) → Maximum file size: 100 MB — aim for under 10 MB in practice for fast mobile loading → Accepted formats: PDF, PPT, PPTX — PDF is the most reliable → Performance: 2.3× more median impressions than plain text, based on our study of 438,413 posts
How many slides should a LinkedIn carousel have?
LinkedIn technically accepts up to 300 pages per document. In practice, stay in the 5 to 15 slide range.
Why this limit? The algorithm measures completion rate — how many slides a reader swipes through before leaving. A 30-slide carousel will almost always be read at under 30% completion, which sends a negative signal and reduces distribution.
| Number of slides | Recommended use | |-----------------|-----------------| | 3 to 5 | Quick tip, key stat, mini-list | | 6 to 10 | Step-by-step guide, mini-tutorial | | 11 to 15 | In-depth analysis, case study | | 16 and above | Avoid unless the content is very dense and expert-level |
The first slide is the only one visible in the feed before someone taps to open. It functions as a visual hook — treat it like the opening line of a text post.
What dimensions should you use?
LinkedIn displays documents in either 1:1 or 4:5 format in the feed. Recommended dimensions:
→ 1080×1350 px (portrait 4:5) — takes up the most screen space in the mobile feed, maximizing dwell time → 1080×1080 px (square 1:1) — a solid alternative, compatible with all contexts → 1920×1080 px (landscape 16:9) — avoid this: displayed as a thumbnail, nearly invisible on mobile
The portrait 4:5 format covers more screen on a smartphone. Since LinkedIn is primarily used on mobile, this format maximizes the time someone spends stopped on your post.
What file format should you upload?
LinkedIn accepts three formats:
→ PDF: the most reliable. Fonts and visuals are embedded, no display issues. → PPT / PPTX: accepted, but non-standard fonts may be substituted. Always export to PDF if you're using a specific typeface.
On file size: the official limit is 100 MB. In practice, aim for under 10 MB for fast loading. A well-compressed PDF with optimized images easily stays under 5 MB for 10 slides.
A few technical things to check before uploading: → Image resolution: 72 to 150 dpi is enough for screen (300 dpi is unnecessary) → Fonts embedded in the PDF — otherwise LinkedIn substitutes them → No interactive layers or PDF form fields
Why the carousel is the most powerful format
The technical specs are only part of the equation. What makes the carousel compelling is its effect on algorithmic signals.
Our study on 438,413 LinkedIn posts shows that carousels generate, in median: → 2.3× more impressions than plain text → 4× more comments
The reason is mechanical: a carousel creates dwell time. The reader swipes through slides, stays on the post, and the algorithm interprets that behavior as a relevance signal. A plain text post is read in a few seconds. A carousel holds attention for 30 to 60 seconds. That difference changes everything for distribution.
It is the same principle as long-form text — the longer you hold attention, the more LinkedIn amplifies. The difference is that the carousel does it with a visual format, accessible to a broader audience.
To see how this format fits into a complete strategy, read our guide on LinkedIn post formats that perform.
How to create a carousel that performs technically
The specs are a necessary condition, not a sufficient one. Here are the settings that actually move the needle:
→ Slide 1: the visual hook — short title, high contrast, zero filler text. This is your cover. → Last slide: the CTA — tell readers explicitly what to do next (follow, comment, save). Carousels without a closing CTA leave value on the table. → Post text above the document — LinkedIn shows 2 to 3 lines before "see more." Your text hook needs to earn the tap. → Visual consistency — same palette, same typography from one slide to the next. An inconsistent carousel creates friction.
For a deeper look at structure and storytelling, check out the complete LinkedIn carousel guide.
What to do right now
Before publishing your next carousel, run through this 2-minute checklist:
- PDF format, under 10 MB, 1080×1350 px
- Between 6 and 12 slides
- Slide 1 with a hook readable in 2 seconds
- Post text with a clear promise in the first 200 characters
LinkPost generates carousel visuals directly from text or a brief with the AI Visuals tool. You can also analyze your post hook before publishing with the free post analyzer.
The performance figures cited (2.3× impressions, 4× comments) come from the LinkPost observational study on 438,413 posts (2020 to April 2026, 62% French-language content). These are correlations, not causal relationships. Sampling bias is possible. Full methodology in the playbook.
About the author
Yannis Haismann
Co-founder of LinkPost
Yannis writes about LinkedIn content creation, virality prediction and the algorithm. He builds LinkPost, calibrated on more than a million analyzed posts.
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