The Complete Guide to LinkedIn Ad Sizes: Specs, Best Practices, and Formats for Success

When it comes to B2B marketing, LinkedIn is the ultimate powerhouse. With over a billion professionals networking, sharing industry insights, and seeking out business solutions, it offers an unparalleled audience for advertisers. However, capturing attention in a busy professional feed requires more than just a compelling hook and strong targeting—it requires flawless visual execution.

Using the wrong ad dimensions can result in awkward cropping, blurry scaling, or ads that get scrolled past without a second glance. To ensure your brand looks professional and polished, you need to master LinkedIn ad sizes across all formats.

Here is your comprehensive guide to LinkedIn ad dimensions, file specifications, and best practices for 2026.

Why LinkedIn Ad Sizes Matter

LinkedIn’s professional audience has high expectations. Grainy, poorly formatted, or distorted images immediately signal a lack of attention to detail, which can harm your brand credibility. By adhering to LinkedIn’s exact technical specifications, you ensure:

• Optimal Display: Your text and visuals remain crisp across desktop and mobile devices.
• Maximum Engagement: Properly formatted ads take up prime screen real estate, capturing user attention.
• Algorithm Favorability: High-performing visual formats naturally drive better click-through rates (CTR) and lower cost-per-click (CPC).

1. Single Image Ads

Single image ads appear directly in the LinkedIn feed and are among the most versatile formats for brand awareness, lead generation, and content promotion.

• Landscape (Horizontal):
  • Recommended Size: 1200 x 627 pixels
  • Aspect Ratio: 1.91:1
• Square:
  • Recommended Size: 1200 x 1200 pixels
  • Aspect Ratio: 1:1
• Vertical (Portrait):
  • Recommended Size: 628 x 1200 pixels
  • Aspect Ratio: 1:2 (Note: Vertical ads take up the most screen real estate on mobile devices and typically yield higher engagement rates).
• File Requirements:
  • Max file size: 5 MB
  • File types: JPG, PNG, GIF (non-animated)

2. Carousel Image Ads

Carousel ads allow you to showcase multiple images in a swipeable format, making them ideal for telling a story, breaking down a step-by-step process, or highlighting a suite of products/services.

• Card Size: 1080 x 1080 pixels
• Aspect Ratio: 1:1 (Square)
• Card Count: 2 to 10 cards per carousel
• File Requirements:
  • Max file size per card: 10 MB
  • File types: JPG, PNG

3. Video Ads

Video is one of the most engaging ways to capture attention on LinkedIn, whether you are running thought-leadership clips, product demos, or customer testimonials.

• Landscape Video:
  • Resolution: 1920 x 1080, 1280 x 720, or 640 x 360 pixels
  • Aspect Ratio: 16:9
• Square Video:
  • Resolution: 1080 x 1080 or 720 x 720 pixels
  • Aspect Ratio: 1:1
• Vertical Video:
  • Resolution: 1080 x 1350, 720 x 900, or 720 x 1280 pixels
  • Aspect Ratio: 9:16 or 4:5
• File Requirements:
  • File size: 75 KB to 200 MB
  • Duration: 3 seconds to 30 minutes (though 15–30 seconds typically performs best for awareness)
  • File types: MP4

4. Text and Dynamic Ads (Follower, Spotlight, Job)

Text ads and dynamic personalized ads appear on the right-hand rail of the desktop experience. While smaller in scale, they are fantastic for low-cost lead generation, job recruitment, and growing follower counts.

• Company Logo (for Dynamic Ads):
  • Recommended Size: 100 x 100 pixels (minimum)
  • File Types: JPG, PNG
• Custom Background Image (for Spotlight Ads):
  • Recommended Size: 300 x 250 pixels
  • Max File Size: 2 MB
• Ad Copy Limits:
  • Headline: Up to 50 characters
  • Description: Up to 70 characters
  • Company Name: Up to 25 characters

5. Document Ads (Lead Gen Documents)

Document ads allow you to share valuable gated or ungated assets—such as whitepapers, research reports, and eBooks—directly within the LinkedIn feed, letting users preview documents without leaving the app.

• Supported File Types: PDF, DOC, DOCX, PPT, PPTX
• Max File Size: 100 MB
• Page Limit: Up to 300 pages (recommended 5–15 pages for high conversion)
• Orientation: Portrait or Landscape (Portrait/Square formats perform exceptionally well on mobile screens)

Best Practices for LinkedIn Ad Design

1. Design for Mobile First: Over 60% of LinkedIn traffic comes from mobile devices. Vertical and square formats take up more physical space on a phone screen, significantly boosting visibility.
2. Keep Text Minimal on Images: While LinkedIn no longer strictly enforces the old “20% text rule,” ads cluttered with text can look spammy and perform poorly. Let your accompanying ad copy do the heavy lifting.
3. Include a Clear Call-to-Action (CTA): Utilize LinkedIn’s built-in CTA buttons (