LinkedIn Carousel & Slide Aspect Ratio Checker
LinkedIn document slide posts generate up to 3x higher engagement than static image updates. Use our visual checker to validate that every slide conforms to optimal 1:1 square or 4:5 portrait aspect ratios before you export to PDF.
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Use an automated preflight that reads the input PDF’s first page bounding box and rasterizes test renders at 1080px wide/720px tall (for 1:1) and 1080px wide/1350px tall (for 4:5). Then compare the resulting pixel-perfect output to detect hidden letterboxing/cropping introduced by PDF margins—only pass the upload if the non-transparent content occupies at least 96% of the target frame on both axes.
If your LinkedIn carousel PDF pages appear “zoomed” or cut off on the second/third page, it’s usually inconsistent page boxes (MediaBox/CropBox) across pages. Fix by normalizing the PDF so every slide page uses identical CropBox dimensions (e.g., export each slide page to a single-page PDF with the same canvas size, then merge). Re-run the checker after re-export and verify that page-to-page aspect ratio matches exactly (no ±1px variance).
🚀 How to Use the LinkedIn Carousel & Slide PDF Aspect Ratio Checker
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01
Select an image or preview graphic of your LinkedIn slide deck.
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Inspect our aspect ratio bounding box to verify whether your image aligns with 1:1 (1080x1080px) or 4:5 (1080x1350px) specs.
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Preview how the navigation controls will overlay on your carousel cards.
💡 Frequently Asked Questions
Q: What is the best aspect ratio for LinkedIn PDF Carousels?
We strongly recommend 4:5 vertical portrait dimensions (1080x1350px) because it occupies maximum real estate on mobile device feeds.
Q: What formats does LinkedIn support for Document slide posts?
LinkedIn supports PDF, PPT, PPTX, DOC, and DOCX formats up to 100MB and 300 pages max.
Q: What exact PDF page size/crop settings should I use for LinkedIn document carousel slides so they don’t get center-cropped, and how do I validate it programmatically?
For LinkedIn document-style carousel pages, target a content frame with a strict 1:1 (square) or 4:5 (vertical) aspect, then ensure the PDF page CropBox matches that same aspect with no extra whitespace. Programmatically validate by rasterizing each page to 1080px (square) or 1080x1350px (4:5) and confirming the detected non-background bounding box stays within the frame margins—use a threshold of ≥96% coverage of width and height with ≤1px differences in the computed aspect ratio. If any page falls below 96% coverage or deviates by more than ±0.01 in aspect ratio, re-export with normalized crop boxes.
Q: How can I prevent LinkedIn from truncating small text in a carousel PDF—what minimum font-size and safe-area rules should my aspect-ratio checker enforce?
LinkedIn tends to downscale PDF-rendered slide content differently depending on the chosen aspect, so enforce a safe-area and minimum legibility threshold. For 1:1, require key text to remain inside at least a 7% inset on all sides (a 1080px canvas implies ~75px padding), and for 4:5 enforce at least an 8% inset (1080x1350 implies ~108px padding) because vertical feeds compress more aggressively. Additionally, flag slides where the smallest estimated font height would rasterize below 28px at 1080px reference width—your checker should compute expected text height from bounding boxes and warn when it drops under 28px.
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