LinkedIn Ad Sizes Guide: Dimensions & Specs for Every Format

The Ultimate Guide to LinkedIn Ad Sizes: Stop Pixelating Your B2B ROI

Picture this: You’ve spent weeks refining your target audience, crafting a sharp hook, and aligning your campaign budget. You upload your creative asset, and—crunch—LinkedIn crops half your headline, or your crisp infographic looks like it was captured on a flip phone from 2008.

In B2B marketing, credibility is everything. When your ad looks blurry or poorly cropped, prospective clients notice. Getting your LinkedIn ad sizes right isn’t just a technical checklist item; it is the fundamental baseline for protecting your ad spend and maintaining brand authority.

Whether you are launching single-image sponsored content, a multi-card carousel, or dynamic text units, here is your definitive, up-to-date guide to mastering LinkedIn ad specifications.

1. Single Image Ads (Sponsored Content)

Single image ads are the backbone of most B2B demand-generation campaigns. They sit right in the professional feed, meaning they compete directly with organic insights and industry news.

To maximize your screen real estate without getting penalized by awkward cropping, stick to these dimensions:

• Landscape (1.91:1): $1200 times 627$ pixels
• Square (1:1): $1200 times 1200$ pixels (Great for taking up more vertical feed space)
• Vertical / Portrait (4:5): $720 times 900$ pixels (Note: Vertical ads serve exclusively on mobile placements)
• File Formats: JPG, PNG, or non-animated GIF
• Maximum File Size: 5 MB

Pro Tip: Stick to the square ($1200 times 1200$) or vertical ($720 times 900$) formats if you want to command more attention in the mobile scroll. Landscape is safe, but square configurations secure significantly more physical screen dominance.

2. Carousel Image Ads

Carousels are storytelling workhorses. They are ideal for breaking down complex frameworks, showcasing a suite of product features, or presenting step-by-step case studies.

• Card Dimensions: $1080 times 1080$ pixels ($1:1$ ratio)
• Card Count: 2 to 10 cards per ad
• File Formats: JPG or PNG
• Maximum File Size: 10 MB per card
• Text Limits: Card headlines are capped at 45 characters. Keep them punchy!

3. Video Ads

With a vast majority of professionals watching LinkedIn video content on mute, your sizing needs to support compelling visual framing and clear burned-in captions.

LinkedIn supports multiple orientations depending on where your video asset was originally mastered:

• Landscape (16:9): $1920 times 1080$ pixels (Recommended for cross-platform utility)
• Square (1:1): $1080 times 1080$ pixels
• Vertical (9:16 or 4:5): $1080 times 1920$ or $1080 times 1350$ pixels
• File Size & Length: Up to 500 MB; durations range from 3 seconds up to 30 minutes (though 15–30 seconds typically wins on engagement).
• Formats: MP4 or MOV

Crucial Rule: Always upload a matching thumbnail image (JPG/PNG, under 2 MB) and a clean SRT caption file. If you leave captions out, you instantly lose a massive chunk of your audience scrolling in silence.

4. Text & Dynamic Ads (Right-Rail Powerhouses)

Text ads and dynamic variants (like Spotlight or Follower ads) live on the desktop right-rail. While small, they offer high-frequency, low-cost brand reinforcement.

• Company Logo / Image Asset: $100 times 100$ pixels (JPG or PNG, max 2 MB)
• Spotlight Background Image (Optional): $300 times 250$ pixels (Max 2 MB)
• Text Constraints: Headlines are tight (usually 25 characters for text ads, up to 50 for spotlight ads), so prioritize clarity over cleverness.

Quick Blueprint: Text and Character Limits to Remember

Formatting isn’t just about pixels—text truncation can ruin an otherwise brilliant creative. Keep these baseline character caps handy before writing your copy: