The Ultimate Guide to LinkedIn Post Sizes and Dimensions

Getting your content noticed on LinkedIn is part art, part science. You can craft the most insightful professional takeaway or provocative industry critique, but if your visual assets are awkwardly cropped, pixelated, or poorly formatted, your engagement plummets. In the fast-paced world of the LinkedIn feed, formatting is the silent gatekeeper of attention.

Whether you are publishing a standard thought-leadership update, a multi-slide carousel, or native video, mastering the precise pixel dimensions ensures your content looks professional and captures the eye.

1. Single Image Posts

Single images are the cornerstone of visual storytelling on LinkedIn. They help break up text-heavy feeds and stop the scroll. Depending on your design layout, you have a few optimal choices:

• Landscape (1.91:1 Aspect Ratio): 1200 x 627 pixels
  • Best for: Link previews, landscape photographs, and wide banners. This wide layout ensures that the platform doesn’t awkwardly crop the edges when displayed natively in feeds.
• Square (1:1 Aspect Ratio): 1080 x 1080 pixels
  • Best for: Quotes, infographics, and bold branded graphics. Square images consume a balanced amount of screen estate on both desktop and mobile views.
• Portrait (4:5 Aspect Ratio): 1080 x 1350 pixels
  • Best for: Maximum mobile visibility. Portrait images push past surrounding clutter, taking up more vertical space on smartphone screens where most professionals browse.

2. Document & Carousel Posts (PDFs)

Document carousels are among the highest-performing content types on LinkedIn for sharing step-by-step guides, frameworks, and deep dives.

• Recommended Size: 1080 x 1080 pixels (Square) or 816 x 1056 pixels (Standard Letter portrait format, matching an 8.5×11-inch document layout).
• File Formats: PDF (preferred), DOC, DOCX, PPT, or PPTX.
• Specs: Up to 300 pages max (though 10 to 25 pages is the sweet spot for retention), with a maximum file size of 100 MB.

Pro Tip: Keep all slides uniform. If you mix landscape and square slides, LinkedIn will automatically force-crop subsequent slides to match the dimensions of your first page.

3. Native Video Posts

Video continues to dominate professional feeds, driving high interaction rates when optimized correctly.

• Recommended Resolution: 1280 x 720 pixels (16:9 aspect ratio) or 1080 x 1080 pixels (1:1 square).
• File Size: Up to 5 GB (though heavily compressing to speed up uploads is recommended).
• Duration: From 3 seconds up to 10 minutes (the optimal sweet spot for engagement generally sits between 30 and 90 seconds).
• Formats: MP4 or AVI.

Pro Tip: Many professionals scroll LinkedIn with the sound muted by default. Always upload an external .SRT subtitle file or bake captions directly into your video.

4. Text Character Limits

While visual sizing is vital, text constraints dictate how your copy flows.

• Post Body Limit: 3,000 characters.
• The “See More” Break: On mobile and desktop, LinkedIn typically truncates posts after the first 2 to 3 lines (roughly 140–210 characters). Your hook must live in these opening lines.
• Sweet Spot for Length: High-performing informational posts generally range between 1,200 and 1,500 characters—long enough to provide substantive value, but structured with plenty of white space, short paragraphs, and bullet points for readability.

Summary Checklist for Designers

| Post Type | Ideal Dimensions | Aspect Ratio | Max File Size |
| :— | :— | :— | :— |
| Standard / Link Image | 1200 x 627 px | 1.91:1 | 5 MB |
| Square Image | 1080 x 1080 px | 1:1 | 10 MB |
| Portrait Image | 1080 x 1350 px | 4:5 | 10 MB |
| Document / Carousel | 816 x 1056 px | Letter / 1:1 | 100 MB |
| Video Thumbnail | 1280 x 720 px | 16:9 | 2 MB |

By respecting these technical guardrails, you ensure your content looks polished on high-end desktop monitors and mobile devices alike, allowing your ideas—not your formatting errors—to take center stage.