The Complete Guide to LinkedIn Ad Sizes and Specs

Running B2B campaigns on LinkedIn is a powerful way to reach decision-makers, executives, and high-value prospects. However, even the most compelling copy and well-targeted audience will fall flat if your creative assets render with blurry pixels, awkward cropping, or get rejected entirely by platform guidelines.

LinkedIn has precise technical requirements for every ad format. Knowing the exact dimensions, aspect ratios, and file limits ensures your brand looks polished and professional from the moment a user scrolls past.

1. Single Image Ads (Sponsored Content)

Single image ads are the backbone of LinkedIn advertising. They appear directly in the user’s feed and support a headline, introductory text, and a call-to-action (CTA) button.

LinkedIn supports three main aspect ratios for single image ads, giving you flexibility depending on whether your design is horizontal, square, or vertical:

• Landscape (1.91:1):
  • Recommended Size: $1200 times 627$ pixels
  • Best for: Traditional desktop viewing and repurposed website banners.
• Square (1:1):
  • Recommended Size: $1200 times 1200$ pixels
  • Best for: Balanced performance across both desktop and mobile feeds.
• Vertical (4:5):
  • Recommended Size: $1200 times 1500$ pixels (or $720 times 900$ pixels minimum)
  • Best for: Maximizing mobile screen real estate and driving higher engagement.

Technical Specifications:

• File Types: JPG, PNG, or GIF
• Max File Size: 5 MB

2. Carousel Ads

Carousel ads let you feature a sequence of up to 10 swipeable cards, making them ideal for product feature breakdowns, step-by-step guides, or multi-part thought leadership stories.

• Card Size: $1080 times 1080$ pixels strictly ($1:1$ aspect ratio)
• Number of Cards: 2 to 10 cards
• File Types: JPG or PNG (Animated GIFs are not supported for carousels)
• Max File Size: 10 MB per card

Design Tip: When designing carousel cards, leave a small “safe zone” at the bottom of each card, as the card headline overlays slightly on certain mobile devices.

3. Video Ads

Video is one of the most engaging ways to showcase product demos, client testimonials, or culture-building clips. LinkedIn supports horizontal, square, and vertical video layouts.

• Landscape (16:9): $1920 times 1080$ pixels
• Square (1:1): $1080 times 1080$ pixels
• Vertical (4:5 or 9:16): $1080 times 1350$ pixels or $1080 times 1920$ pixels

Technical Specifications:

• File Format: MP4 or MOV
• Max File Size: Up to 5 GB
• Duration: 3 seconds to 10 minutes (though 15 to 30 seconds typically yields the highest completion rates for feed ads)

4. Document Ads

Document ads allow you to upload native PDFs, whitepapers, or slide decks directly into the feed. Users can flip through the pages right inside LinkedIn without navigating away.

• Recommended Page Size: Letter or A4 layout (landscape or portrait, though landscape displays nicely in mobile previews)
• File Types: PDF, DOC, DOCX, PPT, or PPTX
• Max File Size: 100 MB
• Page Limit: Up to 300 pages (though shorter, punchier assets around 5 to 15 pages perform best)

5. Text & Spotlight Ads (Desktop Right-Rail)

If your campaign focuses heavily on cost-efficient desktop lead generation or follower acquisition, right-rail ads are a staple.

• Text Ads: Require a small company logo sized at $100 times 100$ pixels (JPG or PNG, max 2 MB).
• Spotlight Ads: Feature a $100 times 100$ pixel logo alongside an optional $300 times 250$ pixel background image (JPG or PNG, max 2 MB each).

Quick Reference Table

| Ad Format | Recommended Dimensions | Aspect Ratio | Max File Size | Accepted File Types |
| :— | :— | :— | :— | :— |
| Single Image (Square) | $1200 times 1200$ px | 1:1 | 5 MB | JPG, PNG, GIF |
| Single Image (Vertical) | $1200 times 1500$ px | 4:5 | 5 MB | JPG, PNG, GIF |
| Carousel Card | $1080 times 1080$ px | 1:1 | 10 MB | JPG, PNG |
| Video Ad (Vertical) | $1080 times 1350$ px | 4:5 | 5 GB | MP4, MOV |
| Document Ad | Letter / A4 PDF | Variable | 100 MB | PDF, PPT, DOC |
| Text Ad Logo | $100 times 100$ px | 1:1 | 2 MB | JPG, PNG |

Best Practices for Campaign Success

1. Prioritize Mobile: Over 60% of LinkedIn traffic originates on mobile devices. Designing with square ($1:1$) or vertical ($4:5$) dimensions ensures your message occupies maximum visual real estate in the feed.
2. Keep Text Clean: While LinkedIn no longer enforces a strict 20% text overlay penalty, cluttered images with heavy text struggle to capture attention. Keep core messaging readable and let your headline and description do the heavy lifting.
3. Double-Check Before Launch: Always preview your ads using Campaign Manager’s preview tool across multiple screen sizes to catch awkward line breaks or scaling issues before your budget goes live.