Mastering LinkedIn Ad Sizes: The Ultimate Guide for High-Impact Campaigns

When it comes to B2B marketing, LinkedIn is the premier platform for reaching decision-makers, industry professionals, and high-value prospects. However, even the most compelling copy and precise targeting can fall flat if your visual assets look stretched, blurry, or awkwardly cropped.

Platform-specific dimensions change regularly, and adhering to the exact specifications ensures your brand looks professional and polished. This comprehensive guide covers everything you need to know about LinkedIn ad sizes, best practices, and formats to maximize your return on ad investment (ROAI).

Why LinkedIn Ad Sizes Matter

First impressions count, especially in a crowded feed. LinkedIn users are typically in a professional mindset, browsing industry insights, news, and career updates. If an ad has poor resolution or gets awkwardly cut off by the platform’s layout, it instantly signals a lack of attention to detail.

Using the correct dimensions ensures:

• Optimal Display: Your visuals render sharply across desktop and mobile devices.
• No Cut-Offs: Important text, logos, and calls-to-action (CTAs) remain fully visible.
• Higher Engagement: Clean, well-formatted ads naturally capture attention, leading to higher click-through rates (CTR) and lower cost-per-click (CPC).

1. Single Image Ads

Single image ads appear directly in the LinkedIn feed, making them one of the most common formats for brand awareness and lead generation.

• Recommended Aspect Ratio: 1:1 (Square) or 1.91:1 (Landscape) / 9:16 (Vertical)
• Recommended Image Size:
  • Landscape (1.91:1): 1200 x 627 pixels
  • Square (1:1): 1200 x 1200 pixels
  • Vertical (9:16): 600 x 1060 pixels (great for mobile-first campaigns)
• File Types: JPG or PNG
• Maximum File Size: 5 MB

Pro Tip: For feed ads, square (1:1) and vertical (9:16) formats take up more screen real estate on mobile devices than landscape ads, often resulting in higher visibility and engagement.

2. Carousel Image Ads

Carousel ads let you showcase multiple images or cards in a swipeable sequence. They are ideal for telling a brand story, highlighting a product suite, or sharing step-by-step insights.

• Number of Cards: 2 to 10 cards per ad
• Recommended Image Size: 1080 x 1080 pixels
• Aspect Ratio: 1:1 (Square)
• File Types: JPG or PNG
• Maximum File Size: 10 MB per card

3. Video Ads

Video is one of the most engaging mediums on LinkedIn. Whether you are running brand awareness campaigns or product walkthroughs, getting the aspect ratio right is critical since videos auto-play silently in the feed.

• Aspect Ratios & Dimensions:
  • Landscape (16:9): 1920 x 1080 pixels (or 640 x 360 minimum)
  • Square (1:1): 1080 x 1080 pixels (or 600 x 600 minimum)
  • Vertical (9:16): 1080 x 1920 pixels (or 360 x 640 minimum)
• File Format: MP4
• Frame Rate: 30 fps or lower
• File Size: 75 KB to 200 MB
• Video Length: 3 seconds to 30 minutes (though 15 to 30 seconds typically performs best for engagement)

Pro Tip: Always include burned-in captions or subtitles, as many professionals browse LinkedIn with the sound off by default.

4. Thought Leader Ads & Sponsored Content

Thought Leader Ads allow you to sponsor posts published directly by real employees or executives, driving authenticity and trust.

• Image Requirements: Same as standard single image ads (1200 x 1200 pixels for square, or 1200 x 627 for landscape).
• Video Requirements: Follow standard LinkedIn video specs (16:9, 1:1, or 9:16).

5. Message Ads & Conversation Ads

Directly reaching prospects via LinkedIn Messaging (Sponsored Messaging) requires specific asset sizes if you include custom banners.

• Custom Banner Image (Desktop only):
  • Size: 300 x 250 pixels
  • File Types: JPG, GIF (non-animated), or PNG
  • Maximum File Size: 40 KB

6. Text Ads & Spotlight Ads (Dynamic Ads)

Dynamic ads personalize content based on the viewer’s LinkedIn profile data (such as their company name, job title, or photo).

• Company Logo / Image Size: 100 x 100 pixels (minimum)
• File Types: JPG or PNG
• Maximum File Size: 2 MB

Best Practices for LinkedIn Ad Design

1. Keep Text Minimal on Images: While LinkedIn no longer strictly enforces the old “20% text rule,” cluttered visuals perform poorly. Keep text concise and punchy.
2. Prioritize Mobile: Over 60% of LinkedIn traffic comes from mobile devices. Design your creatives with smaller screens in mind, ensuring text is readable without zooming in.
3. Include a Clear CTA: Use LinkedIn’s built-in button options (