Mastering LinkedIn Paid Ad Specs: The Blueprint for B2B Creative Success
Running successful paid campaigns on LinkedIn requires more than a compelling hook and a high-intent audience. If your creative assets don’t align precisely with platform requirements, you risk automatic cropping, rejection, or worse—wasting valuable ad spend on visuals that look amateurish in the professional feed.
Whether you are launching single-image thought leadership pieces, dynamic carousels, or high-impact video campaigns, nailing the technical dimensions and character limits is non-negotiable.
1. Single Image Ads (Sponsored Content)
Single image ads are the backbone of B2B prospecting. They appear directly in the desktop and mobile feeds, making versatility essential.
- Landscape (1.91:1): 1200 × 628 pixels (Works on desktop and mobile)
- Square (1:1): 1200 × 1200 pixels (Recommended for optimal feed real estate)
- Vertical (4:5): 720 × 900 pixels (Optimized for mobile-only delivery)
- File Formats: JPG, PNG, or GIF
- Max File Size: 5 MB
- Copy Constraints:
- Introductory text: 150 characters recommended (truncates around 150-200, max 600)
- Headline: 70 characters recommended (max 200)
2. Video Ads
Video is unmatched for building brand affinity and explaining complex products, but file handling and aspect ratios must be exact to prevent rendering errors.
- Aspect Ratios & Resolutions:
- Landscape (16:9): 1920 × 1080 pixels
- Square (1:1): Up to 1920 × 1920 pixels
- Vertical (4:5): 720 × 900 pixels (Recommended for feed retention)
- Vertical (9:16): Up to 1080 × 1920 pixels
- Technical Parameters:
- File Type: MP4
- Frame Rate: 30 FPS or lower
- File Size: 75 KB to 500 MB
- Duration: 3 seconds to 30 minutes (though 15–30 seconds typically drives the highest completion rates)
- Thumbnails: Custom JPG or PNG matching the video’s aspect ratio (Max 2 MB)
3. Carousel Image Ads
Carousels are ideal for product feature breakdowns, multi-step frameworks, or step-by-step case studies.
- Card Count: 2 to 10 cards per ad
- Image Size: 1080 × 1080 pixels (1:1 ratio)
- File Formats & Limits: JPG, PNG, or non-animated GIF (Max 10 MB per card)
- Copy Constraints:
- Card Headline: 45 characters max for destination URL cards
- Introductory Text: 255 characters recommended
4. Document Ads
If you are gating a high-value whitepaper, research report, or checklist directly inside the LinkedIn feed, Document Ads allow users to swipe through pages without leaving the platform.
- File Types: PDF, PPT, PPTX, DOC, or DOCX
- Max File Size: Up to 100 MB
- Page Limit: Up to 300 pages (though 5–15 pages usually performs best for engagement)
5. Message and Conversation Ads
Direct-to-inbox formats require a conversational tone and strict adherence to text bounds to avoid text clipping.
- Sender Identity: Requires a linked sender profile with permissions.
- Message Text: Up to 1,500 characters
- Call to Action (CTA) Button: Up to 20 characters
- Optional Desktop Banner: 300 × 250 pixels (JPG/PNG, Max 2 MB)
6. Text and Dynamic (Spotlight) Ads
These desktop-heavy formats are cost-effective choices for driving profile followers, event sign-ups, or website traffic via the right-hand rail.
- Text Ads: 100 × 100 px logo (JPG/PNG, max 2 MB), Headline (25 characters), Description (75 characters).
- Spotlight Ads: 100 × 100 px company logo, optional 300 × 250 px custom background image, Headline (50 characters), Description (70 characters), and CTA (18 characters).
Pro-Tips for Production Success
- Design for “Muted-First”: Over 75% of users scroll LinkedIn with sound off. Always bake open captions or burned-in text overlays into your video assets.
- Keep Safe Zones Clear: Avoid placing critical text, logos, or CTAs in the bottom 20% of vertical feed videos, where platform UI elements (like handles and profile names) tend to overlap.
- Double-Check Mobile Rendering: Since mobile traffic accounts for the vast majority of B2B feed consumption, always preview your final ad variants inside Campaign Manager using a mobile viewport toggle before launching.
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