Mastering LinkedIn Ad Sizes: The Ultimate Guide for Marketers in 2026

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 sophisticated targeting will fall flat if your creative assets look pixelated, awkwardly cropped, or improperly scaled.

Adhering to the correct technical dimensions ensures that your brand looks polished, professional, and trustworthy. This comprehensive guide breaks down the essential LinkedIn ad sizes across every major format to help you maximize your campaign performance.

Why LinkedIn Ad Sizes Matter

LinkedIn users scroll through their feeds with a critical eye. They are looking for industry insights, thought leadership, and business solutions. Blurry images or cut-off text instantly signal a lack of attention to detail, which can harm brand perception.

Using the precise dimensions recommended by LinkedIn offers several distinct advantages:

• Maximized Visibility: Properly sized ads occupy the intended screen real estate without awkward formatting or auto-cropping.
• Higher Engagement: Clean, visually balanced creative captures attention faster, driving higher click-through rates (CTR).
• Professional Credibility: Flawless visual execution reinforces your company’s authority and commitment to quality.

1. Single Image Ads

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

• Recommended Aspect Ratio: 1:1 (Square) or 1.91:1 (Landscape) / 9:16 (Vertical)
• Recommended Resolution (Square): 1080 x 1080 pixels
• Recommended Resolution (Landscape): 1200 x 627 pixels
• Recommended Resolution (Vertical): 1080 x 1350 pixels (or up to 1080 x 1920 pixels for specific placements)
• File Types: JPG or PNG
• Maximum File Size: 5 MB

Pro Tip: While landscape is traditional, vertical and square ads take up more vertical real estate on mobile devices, capturing more visual attention as users scroll.

2. Carousel Image Ads

Carousel ads allow you to showcase multiple images within a single ad unit, making them ideal for telling a brand story, highlighting a product suite, or sharing step-by-step guides.

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

Pro Tip: Maintain a consistent design theme across all cards so the carousel feels cohesive, and use the final card as a strong call-to-action (CTA).

3. Video Ads

Video is one of the most engaging formats on LinkedIn, perfect for product demos, customer testimonials, and company culture highlights.

• Aspect Ratios & Resolutions:
  • Landscape (16:9): 1920 x 1080 pixels (Minimum: 640 x 360)
  • Square (1:1): 1080 x 1080 pixels (Minimum: 360 x 360)
  • Vertical (9:16): 1080 x 1920 pixels (Minimum: 360 x 640)
• File Length: 3 seconds to 30 minutes (though 15–30 seconds performs best for general brand awareness)
• File Types: MP4
• Maximum File Size: 200 MB

Pro Tip: Always design your video ads with subtitles or burned-in captions, as many professionals watch LinkedIn videos on mute while browsing in professional environments.

4. Message Ads (Sponsored Messaging)

Message ads allow you to send personalized content directly to your target audience’s LinkedIn Inbox. While these are text-heavy, they do include a banner asset on desktop views.

• Banner Image Dimensions: 300 x 250 pixels
• File Types: JPG, GIF, or PNG (animated GIFs are not supported for banners)
• Maximum File Size: 40 KB

5. Follower and Spotlight Ads (Dynamic Ads)

Dynamic ads personalize themselves using LinkedIn member data, such as their profile photo, name, and job title.

• Company Logo (for Follower Ads): 100 x 100 pixels (minimum)
• Custom Background Image (for Spotlight Ads): 300 x 250 pixels
• File Types: JPG or PNG
• Maximum File Size: 2 MB

Best Practices for LinkedIn Ad Creatives

1. Keep Text Minimal on Images: While LinkedIn no longer strictly enforces the old “20% text rule,” keeping your imagery clean and uncluttered prevents your message from looking overwhelming.
2. Design for Mobile First: Over 60% of LinkedIn traffic originates from mobile devices. Ensure your typography is large enough to read on smaller screens.
3. Include a Clear Call to Action (CTA): Whether using a button or text overlay, make sure your audience knows exactly what step to take next (