The Complete Guide to LinkedIn Ads Sizes, Specs, and Dimensions (2026)

Mastering LinkedIn advertising requires more than just a compelling hook and a targeted audience. If your visual assets are blurry, awkwardly cropped, or cut off by the platform’s layout constraints, your potential clients or B2B leads will scroll right past.

Because LinkedIn is the premier network for professional networking, your creative quality reflects directly on your brand authority. This comprehensive guide covers every active LinkedIn ad size, format, and technical specification you need to run high-performing campaigns.

1. Single Image Ads (Sponsored Content)

Single image ads appear directly in the user’s desktop and mobile feeds. They are the bread and butter of LinkedIn advertising, perfect for promoting blog posts, whitepapers, webinars, or brand awareness.

• Aspect Ratio: 1.91:1 (Landscape) or 1:1 (Square)
• Recommended Resolution (Landscape): 1200 x 627 pixels
• Recommended Resolution (Square): 1200 x 1200 pixels
• File Types: JPG or PNG
• Maximum File Size: 5 MB
• Text Limits:
  • Introductory text: Up to 150 characters (recommended under 150 to avoid truncation).
  • Headline: Up to 70 characters (recommended under 50).
  • Description: Up to 70 characters (optional, appears below the headline).

Pro Tip: While landscape ads take up more horizontal feed space on desktop, 1:1 square images take up significantly more vertical real estate on mobile devices—where the majority of professionals browse LinkedIn. Consider prioritizing square creatives.

2. Carousel Image Ads

Carousel ads allow you to showcase multiple scrollable cards within a single ad unit. This format is ideal for telling a step-by-step story, highlighting different product features, or breaking down a multi-stat infographic.

• Number of Cards: 2 to 10 cards per ad
• Aspect Ratio: 1:1 (Square)
• Recommended Resolution: 1080 x 1080 pixels per card
• File Types: JPG or PNG
• Maximum File Size: 10 MB per card
• Text Limits:
  • Introductory text: Up to 150 characters.
  • Card headline: Up to 45 characters for sponsored content / 30 characters for Lead Gen Forms.

3. Video Ads

Video is one of the most engaging mediums on LinkedIn for building trust and explaining complex B2B solutions.

• Aspect Ratio Options:
  • 16:9 (Horizontal / Landscape)
  • 1:1 (Square)
  • 9:16 (Vertical)
• Resolutions:
  • 16:9: Max 1920 x 1080 or Min 640 x 360
  • 1:1: Max 1080 x 1080 or Min 360 x 360
  • 9:16: Max 1080 x 1920 or Min 360 x 640
• File Format: MP4
• Frame Rate: 30 fps or lower
• Video Length: 3 seconds to 30 minutes (though 15 to 30 seconds typically yields the highest completion rates for top-of-funnel campaigns).
• Maximum File Size: 200 MB
• Text Limits: Introductory text up to 150 characters; Video headline up to 70 characters.

Note: Always embed Closed Captions (SRT file) into your video ads. A massive percentage of professionals watch LinkedIn videos on mute while at work or in transit.

4. Thought Leader Ads

Thought Leader Ads allow you to amplify authentic, organic posts written by real people—either company executives, employee advocates, or industry influencers—rather than traditional corporate branding.