The Ultimate Guide to LinkedIn Ad Sizes and Specs

Running high-converting campaigns on LinkedIn requires more than just a strong message and precise audience targeting—it requires getting your visual dimensions right. If your creative assets are poorly formatted, they can look pixelated, get awkwardly cropped, or fail to pass LinkedIn’s upload limits altogether.

This guide breaks down the essential ad sizes and technical specifications for LinkedIn’s most popular formats, helping you design ads that look sharp and perform brilliantly.

1. Single Image Ads

Single image ads appear directly in the user’s feed and are great for brand awareness, lead generation, and thought leadership. They support three primary aspect ratios:

• Landscape (1.91:1):
  • Recommended Size: $1200 times 628$ pixels
  • Where it displays: Desktop and mobile
  • Best for: Traditional widescreen visuals and graphics that need breathing room.
• Square (1:1):
  • Recommended Size: $1200 times 1200$ pixels
  • Where it displays: Desktop and mobile
  • Best for: A versatile, balanced look that commands solid screen real estate on mobile devices without getting cropped.
• Vertical (4:5):
  • Recommended Size: $720 times 900$ pixels (or up to $1200 times 1500$ pixels)
  • Where it displays: Mobile only
  • Best for: Maximizing mobile screen space and capturing attention mid-scroll.

Quick Specs: Max file size is 5 MB. Accepted formats are JPG, PNG, or non-animated GIF.

2. Video Ads

Video is a powerhouse format for product demonstrations, customer testimonials, and deep-dive storytelling. LinkedIn supports several aspect ratios depending on your creative style:

• Landscape (16:9): $1920 times 1080$ pixels
• Square (1:1): $1080 times 1080$ pixels (up to $1920 times 1920$)
• Vertical (4:5): $720 times 900$ pixels (or $1080 times 1350$)
• Full Vertical (9:16): $720 times 1280$ pixels (up to $1080 times 1920$)

Quick Specs: Videos must be in MP4 format, running anywhere from 3 seconds to 30 minutes (shorter is usually better for engagement). File sizes can range from 75 KB up to 500 MB.

3. Carousel Ads

Carousel ads let you showcase a sequence of 2 to 10 swipeable cards, making them ideal for telling a step-by-step story, highlighting product features, or breaking down a list of statistics.

• Card Image Size: $1080 times 1080$ pixels (strict 1:1 square ratio)
• Card Limit: 2 to 10 cards
• File Types & Limits: JPG or PNG, max 10 MB per card

4. Document Ads

If you want to share gated content natively—like a whitepaper, ebook, or industry report—Document Ads allow users to preview and flip through files right inside the LinkedIn feed.

• Supported File Types: PDF, DOC, DOCX, PPT, or PPTX
• Page Limit: Up to 300 pages (though shorter documents usually perform better)
• Max File Size: 100 MB

5. Text & Spotlight Ads (Desktop Sidebar)

For lightweight, always-on brand presence, LinkedIn offers smaller right-rail ad units:

• Text Ads: Require a simple $100 times 100$ pixel logo (JPG or PNG, max 2 MB) paired with a brief headline and description.
• Spotlight Ads: Use a $100 times 100$ pixel company logo alongside an optional $300 times 250$ pixel custom background image.

Summary Cheat Sheet

| Ad Format | Ideal Dimension / Ratio | Max File Size | File Types |
| :— | :— | :— | :— |
| Single Image (Square) | $1200 times 1200$ px | 5 MB | JPG, PNG, GIF |
| Single Image (Landscape) | $1200 times 628$ px | 5 MB | JPG, PNG, GIF |
| Video Ads | $1920 times 1080$ px (16:9) | 500 MB | MP4 |
| Carousel Cards | $1080 times 1080$ px | 10 MB per card | JPG, PNG |
| Document Ads | Standard Letter / A4 | 100 MB | PDF, DOCX, PPTX |