The best LinkedIn carousel size is 1080 x 1350 px (portrait, 4:5 ratio) or 1080 x 1080 px (square, 1:1), exported as a single PDF under LinkedIn's 100 MB file limit and 300 page ceiling. Portrait uses more mobile screen space and is the safer default in 2026.
TL;DR
Design at 1080 x 1350 px (portrait) or 1080 x 1080 px (square). Export as one flattened PDF with every page the same size. Stay well under the 100 MB file limit and keep the deck to 8 to 12 slides, even though LinkedIn's technical ceiling is 300 pages. Body text at 24pt or larger, safe margins of 60 to 80 px, and PDF is the most reliable upload format.
The exact pixel sizes, aspect ratios, and upload limits LinkedIn enforces for document posts, based on LinkedIn's own help documentation and current design-tool guidance.
| Format | Pixels | Ratio | Notes |
|---|---|---|---|
| Portrait (recommended) | 1080 x 1350 px | 4:5 | Uses the most vertical mobile screen space, the top pick for feed dwell time |
| Square | 1080 x 1080 px | 1:1 | Safe default, works well if you also repost slides to Instagram |
| Landscape | 1920 x 1080 px | 16:9 | Best for data-heavy slides, charts, and screenshots that need horizontal room |
| Max file size | 100 MB | n/a | LinkedIn's official document upload ceiling per LinkedIn Help |
| Max page count | 300 pages | n/a | Official technical ceiling, but engagement drops hard past 15 slides |
| Supported formats | PDF, PPT, PPTX, DOC, DOCX | n/a | PDF renders most consistently across desktop and mobile |
Square, 1080 x 1080 px
Same dimensions work unchanged if you repost the same slides to Instagram or Facebook.
Slightly easier to design symmetrically for text-heavy quote slides.
Familiar to any designer already exporting square social templates.
Portrait, 1080 x 1350 px (recommended)
Occupies noticeably more vertical space on a mobile feed, so it is harder to scroll past.
The taller canvas gives more room for a headline plus supporting text on the same slide.
Generally the default recommendation from LinkedIn creators and design tools in 2026.
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"How to Create a LinkedIn Carousel Post with 20K+ Impressions/post? (2026 Tutorial)" by Breakcold.
A 9-step playbook covering canvas setup through the final upload, using the dimensions above.
Pick your canvas: 1080 x 1350 px
Start every slide in a design tool (Canva, Figma, or Adobe Express) at 1080 x 1350 px if you want the portrait format, or 1080 x 1080 px for square. Setting the canvas correctly from slide one avoids stretching or letterboxing later.
Design 8 to 12 slides, not more
LinkedIn technically allows up to 300 pages, but completion rate falls sharply after slide 10 to 12. Plan a slide-1 hook, 6 to 10 body slides with one idea each, and a closing slide with a call to action.
Keep body text at 24pt or larger
Carousels are viewed on phones first. Small captions that look fine on a desktop preview become unreadable at thumb-scroll speed. Headlines should sit comfortably above 40pt.
Leave safe margins on every slide
Keep primary text and logos away from the outer edges, roughly 60 to 80 px of padding on all sides. LinkedIn's UI can crop or overlay elements near the edges depending on device.
Use consistent fonts and colors across every slide
Inconsistent slide-to-slide styling is the fastest way to make a carousel look like it was assembled last minute. Lock a 2-font, 2-to-3-color system before designing slide one.
Export as a single flattened PDF
Once all slides are finished, export the full deck as one PDF (not individual images). Flatten any layered elements first so text and effects do not shift or break on LinkedIn's renderer.
Check the file size before uploading
Aim to keep the exported PDF well under LinkedIn's 100 MB ceiling, ideally a few MB, so it loads instantly on mobile data. Large image-heavy PDFs can take several seconds to render on the first swipe, which kills momentum.
Upload as a Document post, add a caption with the hook
Start a new post, choose the document/file icon, and upload the PDF. Write a caption that repeats your slide-1 hook so the post is skimmable even before someone opens the carousel.
Preview on mobile before publishing
LinkedIn's post composer includes a preview. Swipe through it on your phone screen, not just the desktop editor, to confirm text sizes and margins hold up at real scroll speed.
Do
Do Not
Designing at desktop-only sizes. A slide that looks perfect at 1920 x 1080 on a laptop screen can render tiny and unreadable once LinkedIn compresses it into a mobile feed card. Always design and preview at the actual carousel dimensions.
Mixing page sizes inside one PDF. LinkedIn requires every page in the document to share the same dimensions. A single mismatched slide can force the whole deck to letterbox or distort on upload.
Overloading past 15 slides. The 300-page technical ceiling is not a target. Completion rate (the percentage of viewers who swipe to the last slide) drops steeply once a carousel runs past 12 to 15 slides.
Skipping the safe-margin buffer. Text or logos placed flush against the edge risk being cropped by LinkedIn's document viewer chrome on certain devices, especially the swipe arrows on desktop.
Uploading a bloated, image-heavy PDF. A 40 MB PDF from an unoptimized export can visibly lag on the first swipe over mobile data, and viewers abandon a slow-loading carousel within a second or two.
Forgetting a caption that stands alone. Not everyone opens the document. The post caption above the carousel needs its own hook, because it is the only part some scrollers ever read.
Three illustrative scenarios showing how a sizing fix changes how a carousel performs.
A B2B marketing consultant had been exporting carousels at 1080 x 1080 (square) for months with modest reach. Switching the exact same content to a 1080 x 1350 portrait canvas, with no other changes, noticeably increased the amount of screen real estate each slide occupied on mobile, and swipe-through completion improved on the following posts.
A recruiter exported a 14-slide carousel from a design tool at full print resolution, producing a 45 MB file. On mobile data the first slide took a visible beat to render, and several commenters mentioned the carousel felt slow to open. Re-exporting at a compressed, web-optimized setting cut the file to under 4 MB with no visible quality loss.
A first-time carousel creator used 16pt body text because it looked fine while zoomed in on a design tool's canvas. On a real phone screen the text was barely legible, and engagement lagged behind similar posts from the same account. Bumping every body line to 24pt or larger and headlines to 40pt+ made the exact same content noticeably easier to skim.
No, LinkedIn also accepts PPT, PPTX, DOC, and DOCX for document posts, but PDF is the safest choice because it locks fonts, spacing, and colors exactly as designed, with no risk of the layout shifting depending on the viewer's software.
Not necessarily rejected outright, but a PDF with inconsistent page sizes can render with letterboxing or unexpected scaling on some pages. Fixing every page to the same canvas before exporting avoids the problem entirely.
LinkedIn does not publish a strict minimum, but designing at the full 1080 px width (rather than scaling up a smaller file) keeps text and graphics sharp once LinkedIn's feed renders the document at various zoom levels.
Sizing is only half the job. Once the dimensions are locked, the harder problem is usually what to actually say on each slide so the carousel earns a full swipe-through. Tools like Lifast can help draft the hook and slide structure for a LinkedIn carousel from a product idea, so the design work starts from a script that is already built to hold attention.
LinkedIn Help: Upload and Share Documents
Official confirmation of the 100 MB file size and 300 page limit for document posts.
Oktopost: LinkedIn Carousel Best Practices
Source for the 1080x1080, 1080x1350, and 1920x1080 recommended pixel dimensions.
Postiv AI: LinkedIn Carousel Dimensions 2026
Additional confirmation on safe margins, font size minimums, and slide count guidance.
LinkedIn does not have a dedicated 'carousel' upload button the way Instagram or Facebook do. What creators call a LinkedIn carousel is a document post: a PDF, PPT, PPTX, DOC, or DOCX file that LinkedIn renders as a swipeable, multi-page card directly in the feed. Understanding this matters because it explains the size rules. LinkedIn is not compressing individual images the way it does for a photo post; it is rendering pages of a document, one page per slide.
That distinction is also why page dimensions matter so much more for a carousel than for a single feed image. Every page in the PDF should share identical dimensions, because the document renderer expects a uniform page size across the file. A single oddly-sized page can force the entire carousel to shrink, letterbox, or distort to accommodate it.
Both 1080 x 1080 (square) and 1080 x 1350 (portrait) are common, safe choices, and either will render cleanly on LinkedIn. The practical difference is screen real estate. On a phone feed, a 4:5 portrait slide occupies noticeably more vertical space than a 1:1 square slide, which means it is harder to scroll past without registering the content, and there is more room on each slide for a headline plus supporting text.
Square remains a reasonable choice if you are repurposing the exact same slides across other platforms like Instagram, where 1:1 is still the default grid format. Landscape (1920 x 1080, 16:9) is worth reaching for specifically when a slide is dense with a chart, screenshot, or table that reads better wider than it is tall.
The two hard technical limits that LinkedIn enforces on document uploads are a 100 MB maximum file size and a 300-page maximum, according to LinkedIn's own help documentation. Neither of these is a target to aim for. The 100 MB ceiling exists to prevent broken uploads, not to suggest that a near-100 MB carousel will perform well; large files simply load slower on mobile connections. Likewise, the 300-page ceiling is a technical maximum for long-form documents like reports or decks shared as reference material, not a suggestion for a feed carousel meant to be swiped through in under a minute.
Why mobile rendering drives every sizing decision
The vast majority of LinkedIn feed traffic is mobile. Every dimension recommendation on this page, portrait over square, 24pt minimum body text, safe margins away from the edges, exists because of how a document post actually looks on a 6-inch phone screen at arm's length, not how it looks zoomed in on a 27-inch monitor while designing it.
If you are still unsure which of the three dimensions fits your content, walk through these four scenarios.
If your carousel is mostly short text and headlines...
Use 1080 x 1350 px (portrait). The extra vertical room gives each slide space for a headline plus a line or two of supporting copy without feeling cramped.
If you plan to reuse the same slides on Instagram or Facebook...
Use 1080 x 1080 px (square). It is the shared safe size across all three platforms, so you design once and export everywhere without cropping.
If your slides are mostly charts, tables, or screenshots...
Use 1920 x 1080 px (landscape). Wide data visuals lose readability when squeezed into a portrait or square frame; landscape gives them the horizontal room they need.
If you are not sure and want the single safest default...
Use 1080 x 1350 px (portrait). It is the most commonly recommended format across current design guidance and performs well across almost any content type.
Run through these checks on the finished PDF before you upload it to a LinkedIn post.
Every page in the PDF is the exact same pixel dimension, no exceptions.
Canvas is 1080 x 1350 px (portrait), 1080 x 1080 px (square), or 1920 x 1080 px (landscape).
Body text is 24pt or larger, headlines are 40pt or larger.
Important text, logos, and CTAs sit at least 60 to 80 px away from every edge.
The deck is 8 to 12 slides, not stretched to fill unnecessary length.
The file has been flattened so no layered element can shift on upload.
The exported file size is a few MB, nowhere near the 100 MB ceiling.
The caption above the post repeats the slide-1 hook for anyone who does not open the file.
You have previewed the carousel on an actual phone screen, not just the desktop editor.
The details creators ask about once they start exporting their first carousel PDF.
1080 x 1350 px (portrait, 4:5 ratio) is the most commonly recommended size for 2026 because it uses the most vertical space on a mobile feed. 1080 x 1080 px (square, 1:1) is a solid alternative, especially if you repost the same slides to Instagram. Both render cleanly as long as every page in the PDF shares the same dimensions.
Yes. LinkedIn's document upload supports PPT, PPTX, DOC, and DOCX in addition to PDF. That said, PDF is the recommended format because it renders identically across devices; a PowerPoint file can occasionally shift fonts or spacing depending on the viewer's system, while a PDF locks the layout exactly as designed.
LinkedIn technically allows up to 300 pages per document, but that is a technical ceiling, not a design target. Most creators see the strongest completion rates with 8 to 12 slides: enough room for a hook, a handful of supporting points, and a closing call to action, without asking readers to swipe through dozens of pages.
LinkedIn's official limit is 100 MB per document. In practice, aim far below that. A carousel exported and compressed properly should land in the low single-digit megabytes, which loads near-instantly on mobile data. A file approaching the 100 MB ceiling will visibly lag on the first swipe.
LinkedIn renders each PDF page largely as designed rather than aggressively cropping it, but the feed preview card and the swipe-arrow chrome can visually crowd content placed too close to the edges. That is why a safe margin of roughly 60 to 80 px on all sides is recommended, so no important text or logo sits right at the border.
Yes. LinkedIn removed a native, separate carousel upload option some time ago, but the format lives on entirely through document posts. Any multi-page PDF, PPT, or DOC uploaded to a normal post renders as a swipeable carousel in the feed, which is exactly how creators still build and publish carousels today.