The Definitive Guide to LinkedIn Ad Sizes and Specs

Running ads on LinkedIn without matching the platform’s exact pixel dimensions is an expensive way to learn about technical constraints. Because LinkedIn caters to a professional audience scrolling across desktop monitors and mobile devices alike, formatting errors result in awkward cropping, blurry scaling, or campaign rejection.

Whether you are launching single-image brand awareness campaigns or multi-card carousels, getting the dimensions right protects your budget and your creative design. Here is the master breakdown of LinkedIn ad sizes and specifications.

1. Single Image Ads

Single-image sponsored content appears directly in the professional feed and serves as the workhorse of most B2B campaigns.

• Landscape (1.91:1): 1200 × 628 pixels (Delivers across desktop and mobile)
• Square (1:1): 1200 × 1200 pixels (Provides maximum screen estate on both desktop and mobile)
• Vertical (4:5): 720 × 900 pixels (Optimized for mobile-only feeds)
• File Formats: JPG, PNG, or non-animated GIF
• Max File Size: 5 MB

Pro Tip: Square and vertical formats naturally occupy more vertical feed space on smartphones, consistently yielding higher engagement rates than traditional landscape ads.

2. Carousel Image Ads

Carousels let you feature a sequence of 2 to 10 swipeable cards, making them ideal for step-by-step guides, product breakdowns, or multifaceted value propositions.

• Card Dimensions: 1080 × 1080 pixels
• Aspect Ratio: 1:1 (Square)
• File Formats: JPG, PNG, or non-animated GIF
• Max File Size: 10 MB per card
• Card Limit: 2 to 10 cards

3. Video Ads

Video is unmatched for demonstrating complex enterprise software, running client testimonials, or building brand authority. LinkedIn supports several distinct aspect ratios depending on your production style:

| Orientation | Aspect Ratio | Recommended Resolution |
| :— | :— | :— |
| Landscape | 16:9 | 1920 × 1080 px |
| Square | 1:1 | 1920 × 1920 px max |
| Vertical | 4:5 | 720 × 900 px (or up to 1080 × 1350 px) |
| Full Vertical | 9:16 | 1080 × 1920 px |

• File Format: MP4
• File Size Range: 75 KB to 500 MB
• Duration: 3 seconds to 30 minutes (though high-performing response rates typically hover between 15 to 30 seconds).

4. Text and Dynamic Ads (Spotlight & Follower Ads)

Found primarily on the desktop right-rail, these units rely on minimal text and clean branding to drive profile follows or website traffic.

• Text Ads: 100 × 100 pixels for the logo (JPG or PNG; max 2 MB). Headline limited to 25 characters; description limited to 75 characters.
• Spotlight Ads: 100 × 100 pixels for the company logo, accompanied by an optional 300 × 250 pixel background asset.

5. Message and Conversation Ads

Delivered straight into a user’s LinkedIn Messaging inbox, these ads create a direct, personalized line of communication.

• Desktop Banner (Optional): 300 × 250 pixels (JPG or PNG, max 2 MB). Note that this banner only appears when targets view messages on a desktop computer.

Quick Checklist for Launching Clean Ads

1. Design for Mobile First: Over 60% of LinkedIn traffic originates on mobile devices. Square (1:1) and vertical (4:5) frames protect your creative from getting lost in the scroll.
2. Watch Text Safe Zones: Avoid placing critical text, logos, or CTAs right along the extreme edges of your images where interface buttons or cropping might overlap.
3. Double-Check Compression: Keep static image files comfortably under the 5 MB threshold to prevent platform-side degradation during upload.