The Ultimate Guide to LinkedIn Ad Sizes and Specs: Mastering B2B Creative in 2026

When you’re running campaigns on LinkedIn, the professional network of choice for B2B marketers, your targeting can be razor-sharp. You can zero in on decision-makers by job title, company size, industry, and seniority. But there’s a catch: if your creative looks blurry, crops awkwardly, or fails to respect platform dimensions, even the most precise targeting won’t save your ROI.

LinkedIn users are professionals browsing with purpose. They have high standards for visual quality and zero patience for sloppy design. Understanding and implementing the correct LinkedIn ad sizes isn’t just about avoiding error messages—it’s about capturing attention in a crowded feed, building trust, and driving conversions.

Whether you’re setting up a Single Image Ad, launching a Thought Leader Ad, or building out a complex Carousel, this comprehensive guide covers every essential LinkedIn ad size and specification you need to know.

Why LinkedIn Ad Sizes Matter More Than Ever

Before diving into the pixel counts, let’s look at the “why.” LinkedIn’s feed is a high-stakes environment. Professionals scroll through career updates, industry insights, and thought leadership content.

When your ad appears, it competes directly with organic posts from industry leaders and colleagues. Correct sizing ensures:

• Zero Pixelation: Crisp, high-resolution visuals signal professionalism and authority.
• Optimal Framing: Proper aspect ratios prevent crucial text, logos, or call-to-action (CTA) buttons from getting cropped out on mobile or desktop views.
• Maximum Engagement: Native-looking, well-proportioned ads naturally invite likes, comments, and clicks.

1. Single Image Ads (Sponsored Content)

Single image ads appear directly in the LinkedIn feed. They are your go-to format for brand awareness, lead generation, and content promotion.

Depending on your design preference, you can choose horizontal, square, or vertical layouts. (Pro tip: Vertical ads take up more real estate on mobile feeds and typically yield higher engagement rates).

• Landscape (Horizontal)
  • Recommended Size: 1200 x 627 pixels
  • Aspect Ratio: 1.91:1
• Square
  • Recommended Size: 1200 x 1200 pixels
  • Aspect Ratio: 1:1
• Vertical (Portrait)
  • Recommended Size: 1080 x 1350 pixels (or 600 x 900 pixels minimum)
  • Aspect Ratio: 4:5
• File Types: JPEG or PNG
• Maximum File Size: 5 MB

2. Carousel Image Ads

Carousel ads let you showcase a series of up to 10 swipeable cards. They are fantastic for telling a step-by-step brand story, breaking down a complex product feature, or displaying multiple products/services in one ad unit.

• Recommended Size: 1080 x 1080 pixels per card
• Aspect Ratio: 1:1
• File Types: JPEG or PNG
• Maximum File Size per Card: 10 MB
• Card Limit: 2 to 10 cards per carousel

3. Video Ads

Video is one of the most engaging ways to capture attention on LinkedIn, whether you’re running product walkthroughs, customer testimonials, or high-level brand spots.

• Landscape Video
  • Resolution: 1280 x 720 (Minimum) up to 1920 x 1080 (Recommended)
  • Aspect Ratio: 16:9
• Square Video
  • Resolution: 600 x 600 up to 1920 x 1920
  • Aspect Ratio: 1:1
• Vertical Video
  • Resolution: 720 x 1280 up to 1080 x 1920
  • Aspect Ratio: 9:16
• File Type: MP4
• Max File Size: 200 MB
• Video Length: 3 seconds to 30 minutes (though keeping it under 30 seconds for top-of-funnel awareness usually drives the best completion rates).

4. Text Ads & Dynamic Ads

Text and dynamic ads (like Follower Ads or Spotlight Ads) appear in the right-hand rail of the desktop experience. While small, they are budget-friendly and great for steady lead acquisition or follower growth.

• Spotlight/Follower Ad Company Logo Size:
  • Recommended Size: 100 x 100 pixels (Square)
• Custom Background Image (for Spotlight Ads):
  • Recommended Size: 300 x 250 pixels
• Text Limits: Keep headlines concise (usually around 25–50 characters) and descriptions punchy (70–75 characters) so they don’t get truncated.

5. Thought Leader Ads

Thought Leader Ads allow you to amplify organic posts written by employees, executives, or industry influencers rather than just your company page. This format relies on authenticity and personal connection.

Because Thought Leader Ads inherit the creative dimensions of the original organic post, they generally support:

• Single Image Posts: Standard 1:1 or 4:5 aspect ratios.
• Video Posts: Standard horizontal, square, or vertical video specs.

Always coordinate with the post author to ensure their base imagery complies with standard aspect ratios before boosting.

Best Practices for LinkedIn Ad Design

Knowing the dimensions is only half the battle. To turn pixels into pipeline, keep these golden rules in mind:

1. Design for Mobile First: Over 60% of LinkedIn traffic happens on mobile devices. If your text is too small to read on a smartphone screen, you’ve lost your audience.
2. Mind the “Safe Zones”: Avoid placing critical text, logos, or faces right along the edges of your images or videos where platform UI elements (like time stamps, duration bars, or profile handles) might overlap them.
3. Include Captions on Videos: Many professionals browse LinkedIn with the sound off in offices or commutes. Always hardcode captions or upload an SRT file for your video ads.
4. Keep Text Minimal: While LinkedIn doesn’t enforce strict text-on-image rules like some platforms, cleaner designs with clear, punchy value propositions consistently outperform cluttered visuals.
5. Test and Iterate: Don’t settle for your first design iteration. A/B test a square image against a vertical video or carousel to see what resonates best with your specific buyer persona.

Summary Checklist

| Ad Format | Ideal Resolution | Aspect Ratio | File Format |
| :— | :— | :— | :— |
| Single Image (Square) | 1200 x 1200 px | 1:1 | JPEG / PNG |
| Single Image (Vertical) | 1080 x 1350 px | 4:5 | JPEG / PNG |
| Carousel Card | 1080 x 1080 px | 1:1 | JPEG / PNG |
| Video (Vertical) | 1080 x 1920 px | 9:16 | MP4 |

By nailing your LinkedIn ad sizes and pairing them with compelling B2B messaging, you’ll ensure your brand looks polished, professional, and impossible to scroll past.