The Ultimate Guide to LinkedIn Post Image Sizes

Visuals are no longer optional on LinkedIn—they are the hook that stops the scroll. Whether you are building a personal brand, running a B2B marketing campaign, or sharing company news, an awkward crop or a pixelated graphic can instantly undermine your credibility.

Because LinkedIn adjusts how it renders media across desktop and mobile feeds, knowing the exact dimensions required for every format is essential. This comprehensive guide breaks down the optimal LinkedIn post image sizes, technical limits, and best practices to keep your content looking sharp.

1. Quick Reference: Core Post Image Sizes

When uploading native images directly to your feed, three main aspect ratios dominate:

| Format | Recommended Dimensions | Aspect Ratio | Best Used For |
| :— | :— | :— | :— |
| Square | $1200 times 1200$ px | $1:1$ | Infographics, quotes, headshots, and general feed posts. (Safe on all devices) |
| Portrait | $1080 times 1350$ px | $4:5$ | Maximizing vertical feed space, tutorials, and document carousels. |
| Landscape | $1200 times 628$ px | $1.91:1$ | Standard landscape photography, charts, and link preview cards. |

2. Breakdown by Format

Single Image Posts

• Square ($1200 times 1200$ px): This is widely considered the safest and most reliable default. It renders cleanly without unexpected cropping on both desktop and mobile screens.
• Portrait ($1080 times 1350$ px): This represents the absolute maximum vertical height ($4:5$ ratio) that LinkedIn’s feed will render. Going taller than $4:5$ (such as a $9:16$ vertical smartphone shot) will result in LinkedIn cropping the top and bottom margins. Use portrait orientation when you want to dominate more screen space on mobile devices.

Link Previews

• Dimensions: $1200 times 628$ px ($1.91:1$ aspect ratio)
• Details: When you paste a URL into a LinkedIn post, the platform automatically generates a link preview card. If your target webpage lacks an Open Graph (OG) image matching these exact dimensions, LinkedIn may default to a tiny, low-resolution square thumbnail on the left. Always ensure your web pages feature optimized $1200 times 628$ px preview images.

Document and Carousel Posts (PDFs)

• Dimensions: $1080 times 1350$ px (or $1080 times 1080$ px) per page
• Details: Document posts (uploaded as PDFs) are among the highest-performing content formats on LinkedIn for driving engagement and saves.
• Specifications: Save your design slides as a uniform PDF document. LinkedIn supports up to 300 pages and 100 MB per document, though keeping carousels to under 10 slides yields the highest completion rates.

Multi-Image Posts

• Dimensions: $1200 times 1200$ px (recommended consistency for all included images)
• Details: You can upload up to 20 images in a single post. Note that the layout is dictated by the first image you upload:
  • If the first image is landscape, it sits as a wide banner on top with the remaining images stacked below.
  • If the first image is square or portrait, it anchors the left column while the rest stack to its right.
  • Tip: Avoid mixing portrait and landscape orientations in the same multi-image post to prevent awkward grid cropping.

3. Technical Constraints and File Limits

To avoid upload errors or compression artifacts, keep these core thresholds in mind:

• Max File Size: 5 MB per individual photo upload (up to 100 MB for document/PDF carousels).
• Supported Formats: JPEG, PNG, WEBP, GIF, and HEIC.
• Megapixel Ceiling: Images can support up to 36 megapixels; anything above this risks failing upload requirements.
• Minimum Resolution: Avoid uploading images with a width under 200 pixels, as they will automatically scale down into unreadable thumbnails.

4. Best Practices for Professional Impact

1. Prioritize Mobile Viewing: Over 60% of LinkedIn traffic occurs on mobile devices. If you include text within your images, use a large, legible font size and keep critical information centered so it doesn’t get clipped.
2. Choose the Right File Type: Use PNG for graphics, UI mockups, and images containing text to maintain sharp lines. Use JPEG or WEBP for photographs to keep file sizes well under the 5 MB ceiling without losing visual fidelity.
3. Add Alt Text: Always utilize LinkedIn’s alt text feature when uploading images. It improves accessibility for visually impaired users and contributes positively to content discoverability.
4. Keep Branding Consistent: Stick to a consistent template size (such as $1200 times 1200$ px squares) across your content calendar so your company page or personal feed maintains a polished, cohesive aesthetic.

By matching your design dimensions to LinkedIn’s native rendering containers, your content will look clean, professional, and optimized to drive maximum engagement.