The Complete Guide to LinkedIn Ad Sizes and Specs (2026)

When you are investing your hard-earned marketing budget into B2B advertising, the last thing you want is a pixelated, awkwardly cropped image ruining your professional brand image. LinkedIn is the premier platform for B2B networking, lead generation, and thought leadership. However, its strict formatting requirements and varied ad placements mean that getting your creative dimensions right is half the battle.

Whether you are launching a brand awareness campaign or driving high-intent conversions, this comprehensive guide covers everything you need to know about LinkedIn ad sizes, aspect ratios, and file specifications to make your campaigns stand out.

Why LinkedIn Ad Sizes Matter

LinkedIn users are professionals browsing the feed during work breaks, commutes, or research sessions. They expect a clean, high-grade aesthetic. If your visuals look distorted or text gets cut off by improper padding, potential clients will scroll right past.

Adhering to the platform’s exact specifications ensures:

• Optimal Readability: Your headlines, body text, and calls-to-action (CTAs) remain legible across both desktop and mobile devices.
• Maximized Real Estate: Properly proportioned ads capture attention without awkward white spaces or unwanted compression artifacts.
• Higher Engagement: Clean, professional creatives naturally drive higher click-through rates (CTR) and lower cost-per-lead (CPL).

1. Single Image Ads

Single image ads appear directly in the LinkedIn feed. They are versatile and work well for promoting blog posts, whitepapers, webinars, or product updates.

• Landscape (Horizontal):
  • 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 600 x 900 pixels)
  • Aspect Ratio: 4:5 or 2:3 (Note: Vertical ads only appear on mobile devices, making them fantastic for stopping the thumb-scroll).
• File Formats: JPG or PNG
• Maximum File Size: 5 MB

2. Carousel Image Ads

Carousel ads allow you to showcase multiple images in a swipeable sequence, perfect for telling a brand story, breaking down step-by-step processes, or highlighting a suite of products.

• Recommended Size: 1080 x 1080 pixels per card
• Aspect Ratio: 1:1
• Number of Cards: 2 to 10 cards
• File Formats: JPG or PNG
• Maximum File Size per Card: 10 MB

3. Video Ads

Video is one of the most engaging ways to capture attention on LinkedIn, whether you are sharing customer testimonials, product walkthroughs, or company culture highlights.

• Orientation & Sizes:
  • Landscape: 1920 x 1080 (16:9 ratio)
  • Square: 1080 x 1080 (1:1 ratio)
  • Vertical: 1080 x 1350 or 1080 x 1920 (9:16 ratio)
• File Format: MP4
• File Size Range: 75 KB to 200 MB
• Video Length: 3 seconds up to 30 minutes (though 15–30 seconds typically yields the highest completion rates for top-of-funnel campaigns).

4. Message Ads (Sponsored Messaging)

Sponsored Messaging (formerly Sponsored InMail) delivers targeted messages directly to your prospects’ LinkedIn inboxes. While text-heavy, they require a supporting companion banner.

• Companion Banner Size: 300 x 250 pixels
• Aspect Ratio: 6:5
• File Formats: JPG, GIF (non-animated), or PNG
• Maximum File Size: 40 KB
• Placement: Desktop-only sidebar right rail.

5. Text Ads & Dynamic Ads

Text ads and dynamic ads (like Follower Ads or Spotlight Ads) sit on the right rail of the desktop experience. Though compact, they are cost-effective for driving steady profile growth or website traffic.

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

Quick Best Practices for LinkedIn Creatives

1. Design for Mobile First: Over 60% of LinkedIn traffic originates from mobile devices. Always check your vertical and square creatives on a mobile screen before pushing them live.
2. Mind the Safe Zones: Keep critical text and logos away from the bottom corners of video and image ads where platform overlays (like timestamps or CTAs) might obstruct them.
3. Keep Text Concise: While LinkedIn allows plenty of character space, imagery should communicate value instantly. Pair clean graphics with strong hooks in your introductory text.
4. Test Multiple Formats: Don’t rely solely on square images. A/B test landscape vs. square vs. vertical formats to see what resonates best with your specific buyer persona.

By sticking to these precise dimensions and keeping your branding sharp, you’ll ensure your LinkedIn ad campaigns look professional, build instant credibility, and deliver a stronger return on investment.