Mastering LinkedIn Ad Sizes: The Ultimate Blueprint for High-Performing Campaigns

In the world of B2B marketing, LinkedIn is the undisputed heavyweight champion. It is where decision-makers, industry leaders, and high-value prospects gather with a professional mindset. However, running a successful LinkedIn advertising campaign requires more than just a compelling hook and a strong call-to-action—it demands visual precision.

When an ad is pixelated, awkwardly cropped, or cut off by the feed, potential clients scroll right past. Understanding and utilizing the correct LinkedIn ad sizes ensures your brand looks polished, professional, and worthy of investment.

Whether you are launching a Single Image ad, a Dynamic campaign, or a Carousel, this comprehensive guide covers every spec you need to master LinkedIn ad dimensions.

Why LinkedIn Ad Sizes Matter

First impressions happen in milliseconds. LinkedIn’s feed is crowded, and your creative competes with text updates, industry news, and competitor promotions. Adherence to platform specs prevents automated cropping from ruining your meticulously designed graphics. Correctly sized ads:

• Maximize Screen Real Estate: Taller formats (like vertical or square images) capture more visual attention as users scroll on mobile devices.
• Enhance Brand Credibility: Crisp, high-resolution imagery signals professionalism and attention to detail.
• Prevent Text Truncation: Knowing where safe zones lie ensures your vital messaging, logos, and CTAs remain visible.

1. Sponsored Content (Feed Ads)

Sponsored Content appears directly in the LinkedIn feed of your target audience on both desktop and mobile devices. These are your bread-and-butter ads for driving brand awareness, lead generation, and website traffic.

Single Image Ads

Single image ads are versatile and support horizontal, square, and vertical orientations. Vertical ads, in particular, dominate mobile screens and generally yield higher engagement rates.

• Landscape:
  • Recommended Size: 1200 x 627 pixels
  • Aspect Ratio: 1.91:1
• Square:
  • Recommended Size: 1080 x 1080 pixels
  • Aspect Ratio: 1:1
• Vertical:
  • Recommended Size: 1080 x 1350 pixels (or up to 1080 x 1920 pixels)
  • Aspect Ratio: 4:5 (or 9:16)
• File Formats: JPG, PNG, GIF (non-animated)
• Max File Size: 5 MB

Carousel Image Ads

Carousels allow you to showcase multiple images or tell a sequential story within a single ad unit.

• Recommended Size: 1080 x 1080 pixels
• Aspect Ratio: 1:1
• Card Count: 2 to 10 cards per ad
• File Formats: JPG, PNG
• Max File Size: 10 MB per card

Video Ads

Video is one of the most engaging mediums on LinkedIn. Make sure your aspect ratios match where your audience is viewing.

• Landscape: 1200 x 675 pixels (16:9 aspect ratio)
• Square: 1080 x 1080 pixels (1:1 aspect ratio)
• Vertical: 1080 x 1350 pixels or 1080 x 1920 pixels (4:5 or 9:16 aspect ratio)
• File Formats: MP4
• Max File Size: 200 MB
• Video Length: 3 seconds to 30 minutes (though 15–30 seconds is typically optimal for performance)

2. Sponsored Messaging (Message & Conversation Ads)

Sponsored Messaging delivers targeted content directly to your prospects’ LinkedIn Inboxes. While these rely heavily on copywriting, visual banners play a major supporting role.

• Banner Image (Desktop Only):
  • Recommended Size: 300 x 250 pixels
  • Aspect Ratio: 6:5
  • File Formats: JPG, PNG, GIF (non-animated)
  • Max File Size: 40 KB
• Custom Footer Image (Optional):
  • Recommended Size: 300 x 50 pixels

3. Dynamic Ads

Dynamic ads personalize content based on the user’s profile data (such as their name, job title, company name, or photo). They appear in the right-hand column of the LinkedIn desktop interface.

Spotlight Ads & Follower Ads

• Company Logo (Square):
  • Recommended Size: 100 x 100 pixels
• Custom Background Image (Optional for Spotlight Ads):
  • Recommended Size: 300 x 250 pixels
  • File Formats: JPG, PNG
  • Max File Size: 2 MB

4. Text Ads

Text ads are simple, cost-per-click (CPC) or cost-per-impression (CPM) ads that appear at the top or right side of the LinkedIn desktop feed. They consist of a small image and concise text.

• Company Logo / Image:
  • Recommended Size: 100 x 100 pixels
  • File Formats: JPG, PNG
  • Max File Size: 2 MB

Best Practices for LinkedIn Ad Design

1. Prioritize Mobile: Over 60% of LinkedIn traffic originates from mobile devices. If you use horizontal layouts, they can appear small and difficult to read. Embrace square (1:1) and vertical (4:5) formats whenever possible.
2. Keep Text Minimal on Images: While LinkedIn no longer strictly enforces the old “20% text rule,” cluttered graphics hurt performance. Keep headline text on images punchy, large, and easy to read at a glance.
3. Design for Sound-Off Viewing: For video ads, assume most users will watch with the sound turned off. Always incorporate captions or clear on-screen text to convey your core message.
4. Test Multiple Variations: Don’t rely on a single asset. A/B test square formats against vertical formats, or test contrasting color schemes to see what resonates best with your specific buyer personas.

Summary Checklist

| Ad Format | Recommended Resolution | Aspect Ratio | File Type |
| :— | :— | :— | :— |
| Single Image (Square) | 1080 x 1080 px | 1:1 | JPG, PNG |
| Single Image (Vertical) | 1080 x 1350 px | 4:5 | JPG, PNG |
| Carousel Card | 1080 x 1080 px | 1:1 | JPG, PNG |
| Video (Vertical) | 1080 x 1920 px | 9:16 | MP4 |
| Messaging Banner | 300 x 250 px | 6:5 | JPG, PNG |

By aligning your design workflow with these exact dimensions, you ensure your LinkedIn campaigns look professional from day one—giving your message the best possible chance to convert.