Mastering LinkedIn Paid Ad Specs: The Blueprint for B2B Creative Success

Running successful paid campaigns on LinkedIn requires more than just a compelling value proposition and precise audience targeting. If your creative assets don’t align with LinkedIn’s strict technical boundaries, your ads will either be rejected outright or—worse—render poorly, destroying your click-through rates.

Because LinkedIn caters to a professional audience operating across corporate desktops, tablets, and mobile devices, optimizing your dimensions, file sizes, and character counts is a critical first step.

1. Single Image Ads

Single image ads remain the backbone of B2B prospecting, demand generation, and lead capture. They appear directly in the target audience’s feed alongside organic posts.

• Landscape (1.91:1):
  • Recommended Size: $1200 times 627$ pixels
  • Best For: Desktop-heavy campaigns, traditional link previews, or wide landscape photography.
• Square (1:1):
  • Recommended Size: $1200 times 1200$ pixels
  • Best For: Cross-platform delivery (desktop and mobile). It is the most versatile format, taking up significantly more vertical real estate on mobile screens than landscape.
• Vertical (4:5):
  • Recommended Size: $720 times 900$ pixels (or $1200 times 1500$ pixels)
  • Best For: Mobile-only feeds where you want maximum thumb-stopping power.
• Technical Constraints:
  • Max File Size: 5 MB
  • File Formats: JPG, PNG, or non-animated GIF

2. Video Ads

B2B buyers consume an immense amount of video content, making native video ads an exceptional choice for product demos, customer testimonials, and brand storytelling.

| Orientation | Recommended Resolution | Aspect Ratio | Max File Size / Length |
| :— | :— | :— | :— |
| Landscape | $1920 times 1080$ px | 16:9 | 5 GB / 3 sec to 30 min |
| Square | $1080 times 1080$ px | 1:1 | 5 GB / 3 sec to 30 min |
| Vertical | $1080 times 1350$ px | 4:5 | 5 GB / 3 sec to 30 min |

• Pro-Tip: While LinkedIn technically permits videos up to 30 minutes, high-converting B2B video ads usually range between 15 to 30 seconds. Always hardcode captions, as a majority of professionals watch feed videos with the sound off.

3. Carousel Ads

Carousels allow you to showcase up to 10 swipeable cards, making them ideal for step-by-step guides, feature breakdowns, multi-stat data stories, or product showcases.

• Card Dimensions: Exactly $1080 times 1080$ pixels (1:1 square ratio).
• Card Limit: 2 to 10 cards per ad.
• File Formats & Size: JPG or PNG, maximum 10 MB per card.
• Design Warning: Leave a small safety margin at the bottom of each card, as the card headline interface can slightly overlap the lower boundary on certain mobile viewports.

4. Document Ads

If you are promoting high-value gated content—such as whitepapers, annual industry reports, or comprehensive ebooks—Document Ads let users flip through pages natively inside the LinkedIn feed without filling out a form immediately.

• Supported File Types: PDF, PPT, PPTX, DOC, or DOCX.
• Page Limit: Up to 300 pages (though 5 to 15 pages tends to perform best for engagement).
• File Size Limit: 100 MB.

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

Though hidden away on the right-hand desktop sidebar, Text and Spotlight ads offer low-cost, steady brand awareness and lead generation opportunities.

• Text Ads: Requires a $100 times 100$ pixel logo (JPG/PNG, max 2 MB), a headline capped at 25 characters, and a description capped at 75 characters.
• Spotlight Ads: Features a personalized dynamic user experience. Requires a $100 times 100$ pixel logo and supports an optional $300 times 250$ pixel background image (max 2 MB each).

Quick-Glance Copy Limits

Beyond the canvas dimensions, copy truncation can ruin an otherwise brilliant creative. Keep these safety limits in mind during copywriting:

• Single Image Intro Text: ~150 characters before truncation on mobile.
• Single Image Headline: ~70 characters.
• Carousel Card Headline: ~45 characters.

By strictly adhering to these specs, you ensure your creative team’s work is displayed cleanly, maximizing your ad budget and driving stronger engagement across the professional network.