LinkedIn’s carousel post format—technically called document posts—lets you upload PDFs that readers swipe through like Instagram carousels. It’s a solid format for reaching professional audiences without leaving the platform.
But there’s a design constraint nobody mentions until after you’ve built your first deck: LinkedIn exports every carousel slide as a 1080×1080 pixel square, regardless of what you uploaded. If you designed slides in 16:9 widescreen or portrait 9:16, the platform letterboxes them with white bars or crops them unpredictably.
This matters because most design tools—Canva, Figma, Keynote—default to landscape aspect ratios for presentation decks. You can spend an hour building a carousel in 1920×1080, upload it to LinkedIn, and watch it get squashed into a square with your text pushed to the edges or cut off entirely.
Why LinkedIn forces square slides
LinkedIn’s document post feature converts uploaded PDFs into image carousels optimised for mobile feeds. The platform standardises everything to 1080×1080 because square posts take up more vertical real estate in the feed and perform better on mobile screens.
The conversion happens server-side. You upload a PDF, LinkedIn rasterises each page, and crops or pads to square. There’s no setting to change this. The upload interface accepts PDFs up to 100 MB and 300 pages, but the output format is non-negotiable.
Design in square from the start
The simplest fix: build your carousel slides at 1080×1080 pixels before you write a single word.
In Canva, create a custom design and set dimensions to 1080×1080 px (or use the Instagram Post preset, which defaults to square). In Figma, create a 1080×1080 frame. In Keynote or PowerPoint, set slide size to custom dimensions: 1080 width, 1080 height, with units in pixels.
This forces you to think vertically. Text blocks need tighter line lengths. Charts and graphs need larger fonts. Horizontally-oriented infographics won’t fit—you’ll need to stack elements instead of spreading them left-to-right.
Square slides also change how you use whitespace. In widescreen decks, you can balance a headline on the left with a visual on the right. In square format, that same layout feels cramped. Center-aligned, single-focus slides work better.
If you’ve already built slides in widescreen
You have three options, none of them fast.
Option one: Rebuild from scratch. Copy your text into a new square template and reposition every element. Time-consuming, but you’ll avoid cropping issues.
Option two: Export widescreen slides as images, then embed them in a square PDF. Create a 1080×1080 canvas in Canva or Figma, place your 1920×1080 slide image in the center, and export each page as a PDF. This preserves your original layout but adds letterboxing (black or white bars above and below). It works if your design can tolerate the padding, but it wastes vertical space.
Option three: Crop strategically. If your widescreen slides have a clear focal point, you can manually crop each one to 1080×1080 in an image editor, keeping the most important content centered. This only works if your text and visuals are already concentrated in the middle third of the slide.
Non-obvious tip: Use safe zones
Even when you design in square, LinkedIn’s mobile app crops the top and bottom of carousel slides slightly when they appear in-feed. Users see the full square only after they tap to expand.
To avoid cut-off text, keep critical content—headlines, CTAs, key data points—within a centered 1080×920 pixel safe zone. That’s roughly 80 pixels of padding on top and bottom.
In Canva, add a rectangle guide at 1080×920, center it, and design inside that boundary. In Figma, create a nested frame. This ensures your most important content is visible even before someone taps through.
One more detail: LinkedIn compresses uploaded PDFs. If you’re using gradients, subtle shadows, or fine typography, export your PDF at high quality (300 DPI if your tool supports it) to minimize artifacting. The platform will still compress it, but starting with a high-resolution source reduces quality loss.
Hit reply and tell us: what’s one LinkedIn carousel design mistake you made that you won’t repeat? We read every response.