The Definitive Guide to LinkedIn Ad Sizes: Specs, Formats, and Best Practices

In B2B marketing, your creative can be brilliant, your targeting razor-sharp, and your offer irresistible—yet your campaign will still stall if your ad dimensions are off. A poorly cropped image or a squished video instantly kills professional credibility, signaling an amateur operation before a prospective client even reads your headline.

Because LinkedIn serves a professional audience across desktop workstations, tablets, and mobile devices, nailing your ad sizes is non-negotiable. This comprehensive guide breaks down the exact dimensions, file requirements, and strategic best practices for every major LinkedIn ad format.

Quick Reference: LinkedIn Ad Sizes at a Glance

| Ad Format | Recommended Dimensions | Aspect Ratio | Max File Size | Supported Formats |
| :— | :— | :— | :— | :— |
| Single Image (Square) | $1200 times 1200$ px | $1:1$ | $5text{ MB}$ | JPG, PNG, GIF |
| Single Image (Vertical) | $1200 times 1500$ px | $4:5$ | $5text{ MB}$ | JPG, PNG, GIF |
| Single Image (Horizontal)| $1200 times 627$ px | $1.91:1$ | $5text{ MB}$ | JPG, PNG, GIF |
| Carousel Ad (Per Card) | $1080 times 1080$ px | $1:1$ | $10text{ MB}$ | JPG, PNG |
| Video Ad (Vertical) | $1080 times 1350$ px | $4:5$ | $5text{ GB}$ | MP4, MOV |
| Video Ad (Square) | $1080 times 1080$ px | $1:1$ | $5text{ GB}$ | MP4, MOV |
| Video Ad (Landscape) | $1920 times 1080$ px | $16:9$ | $5text{ GB}$ | MP4, MOV |
| Text Ad (Logo) | $100 times 100$ px | $1:1$ | $2text{ MB}$ | JPG, PNG |
| Spotlight Ad (Background)| $300 times 250$ px | $6:5$ | $2text{ MB}$ | JPG, PNG |

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.

• Square ($1:1$): $1200 times 1200$ pixels. The Gold Standard. Square ads provide the best visual compromise, commanding solid screen real estate on mobile feeds without getting awkwardly cropped on desktop.
• Vertical ($4:5$): $1200 times 1500$ pixels. The Mobile Dominator. If your audience primarily scrolls LinkedIn on phones, this size maximizes vertical space and pushes competing posts out of view.
• Horizontal ($1.91:1$): $1200 times 627$ pixels. The Traditional Layout. Best for desktop-heavy campaigns or repurposing wide web banners, though it looks smaller on mobile devices.

Pro Tip: Keep file sizes under $5text{ MB}$ and stick to high-contrast JPG or PNG formats. Avoid embedding critical text too close to the edges to prevent interface overlaps.

2. Carousel Ads

Carousel ads let you showcase a sequence of 2 to 10 swipeable cards, making them ideal for step-by-step frameworks, product feature breakdowns, or storytelling.

• Card Dimensions: $1080 times 1080$ pixels ($1:1$ ratio)
• File Size Limit: Up to $10text{ MB}$ per card
• File Types: JPG or PNG

Design Warning: LinkedIn occasionally overlays small UI elements or card headlines near the bottom. Leave a safe padding zone of roughly 50 pixels clear of critical text or important product graphics.

3. Video Ads

Motion content captures attention faster than static imagery in a busy professional feed. LinkedIn supports multiple orientations to suit different creative styles.

• Vertical ($4:5$): $1080 times 1350$ pixels (Best for mobile-first interviews or talking-head clips)
• Square ($1:1$): $1080 times 1080$ pixels (Great for animations and social-style explainers)
• Landscape ($16:9$): $1920 times 1080$ pixels (Ideal for cinematic product demos or polished webinar snippets)
• Technical Specifications: MP4 or MOV format, maximum file size of $5text{ GB}$, and a frame rate around $30text{ fps}$. While videos can run up to 30 minutes, keeping them between 15 to 30 seconds yields peak conversion rates.

4. Text and Dynamic Ads (Right-Rail Formats)

Desktop users will notice smaller placements docked on the right-hand side of the interface. While they have lower visibility, they offer cost-effective retargeting and brand awareness.

• Text Ads: Feature a tiny $100 times 100$ pixel company logo or icon ($1:1$ ratio, max $2text{ MB}$) alongside tight copy.
• Spotlight Ads: Personalize user experiences by pulling profile data (like first names or job titles) into a templated frame. They require a $100 times 100$ pixel logo and support an optional $300 times 250$ pixel background image.

Summary Checklist Before You Launch

Before pushing your campaign live, run your assets through this final checklist:

1. Dimensions & Ratio: Do your pixel dimensions match the exact targets (