Getting your LinkedIn ad specs right is essential for campaign success. Nothing derails a well-planned campaign faster than rejected creatives or poorly displayed ads that look stretched, pixelated, or cut off on mobile devices.

This guide covers every LinkedIn ad format's exact specifications—dimensions, file sizes, character limits, and aspect ratios—so you can create ads that display perfectly across all devices and placements.

Single Image Ad Specs

Single image ads are LinkedIn's most versatile format, appearing in the feed as Sponsored Content. They're ideal for driving traffic, generating leads, and building brand awareness—especially when combined with proven linkedin-lead-generation-campaign tactics.

Image Requirements

Text Limits

Best Practices for Single Image Ads

• Use high-contrast visuals that stand out in a busy feed
• Include minimal text on images—LinkedIn doesn't enforce Facebook's 20% rule, but cleaner images perform better
• Test square images (1080 x 1080) which now display well on mobile and take up more feed real estate
• Ensure your headline is under 70 characters to avoid truncation on desktop

According to LinkedIn's advertising guidelines, images should avoid excessive text overlays for optimal engagement. For more creative inspiration, review these linkedin-advertising-case-studies to see what works.

Carousel Ad Specs

Carousel ads let you showcase multiple images or cards that users swipe through. They're excellent for storytelling, showcasing multiple products, or walking prospects through a process.

Card Requirements

Text Limits for Carousel Ads

Carousel Ad Best Practices

• Use all 10 cards when you have enough quality content—more cards mean more engagement opportunities
• Create visual continuity across cards with consistent colors, fonts, and style
• Tell a sequential story that rewards users for swiping through
• Put your strongest card first as many users won't swipe past the first 2-3 cards
• Include a clear CTA on the final card to drive action after the story

Video Ad Specs

Video ads capture attention and drive engagement, with LinkedIn reporting that members spend 3x more time watching video ads compared to static content. Learn the full strategy behind effective linkedin-video-ad-best-practices to maximize your video performance.

Video Requirements

Video Text Limits

Video Ad Best Practices

• Capture attention in the first 3 seconds—most users decide quickly whether to keep watching
• Design for sound-off viewing with captions or text overlays since many users browse on mute
• Keep videos under 30 seconds for awareness campaigns; longer videos work for consideration-stage content
• Use 1:1 or 9:16 aspect ratios for mobile-first campaigns—vertical video takes up more screen space on phones
• Include captions—LinkedIn auto-generates them, but uploading your own SRT file ensures accuracy

Text Ad Specs

Text ads appear in the right rail on desktop and are LinkedIn's most cost-effective format, often delivering the lowest CPC for b2b-linkedin-advertising campaigns.

Image Requirements

Text Limits

Text Ad Best Practices

• Use a clear, recognizable image—logos or headshots work well at this small size
• Front-load your headline with the most important words
• Include a specific offer or benefit in the description
• Create multiple variations to test different messaging angles
• Target desktop users specifically since text ads don't appear on mobile

Understanding linkedin-cpm-explained can help you budget effectively for these cost-efficient placements.

Message Ad Specs (Sponsored InMail)

Message ads deliver personalized messages directly to LinkedIn members' inboxes. They achieve open rates averaging 50%, significantly higher than email marketing benchmarks.

Message Requirements

Message Ad Best Practices

• Personalize using dynamic fields like first name, company, and job title
• Keep messages under 500 characters for optimal engagement—shorter messages feel more personal
• Use a conversational tone as if writing to a colleague
• Include only one CTA—multiple links dilute focus and reduce conversion
• Test subject lines aggressively—they determine whether your message gets opened

Many linkedin-lead-generation-companies rely heavily on Message Ads for their top-performing campaigns.

Document Ad Specs

Document ads let you share PDFs, PowerPoints, and Word documents directly in the feed. Users can view documents without leaving LinkedIn, making them excellent for lead generation with gated content.

Document Requirements

Text Limits

Document Ad Best Practices

• Design for the preview thumbnail—the first page should be visually compelling
• Use landscape orientation for better in-feed viewing experience
• Keep page count between 5-15 pages for lead magnets—enough value to justify contact info
• Gate strategically—you can require Lead Gen Form completion before viewing
• Include your branding on every page since users may screenshot individual slides

For effective document ad creative, reference linkedin-advertising-templates that have proven performance records.

Conversation Ad Specs

Conversation ads create interactive, choose-your-own-adventure style experiences in LinkedIn messaging. This format is particularly effective when implementing linkedin-retargeting strategies to nurture warm audiences.

Requirements

Event Ad Specs

Event ads promote LinkedIn Events directly in the feed with a one-click attendance button.

Requirements

Lead Gen Form Specs

Lead Gen Forms attach to most ad formats and pre-populate with member profile data for frictionless conversions. They're a cornerstone of best-linkedin-ads-lead-generation strategies.

Form Limits

Quick Reference: All LinkedIn Ad Sizes

Frequently Asked Questions

What is the best image size for LinkedIn ads?

For single image Sponsored Content, use 1200 x 627 pixels with a 1.91:1 aspect ratio. For carousel ads, use 1080 x 1080 pixels (square). Always use the highest resolution possible within file size limits for crisp display on high-density screens. Check how your costs compare across platforms with this facebook-ads-cost-comparison guide.

What video length performs best on LinkedIn?

For awareness campaigns, videos under 30 seconds perform best. For consideration-stage content targeting engaged audiences, 1-2 minute videos can work well. LinkedIn allows up to 30 minutes, but engagement drops significantly after the first minute for most campaigns.

Do LinkedIn ads have text limits on images?

Unlike Facebook, LinkedIn doesn't enforce a strict text-on-image policy. However, images with less text typically perform better because they look more native to the feed. If you must include text, keep it minimal and ensure high contrast for readability.

What file formats does LinkedIn accept for video ads?

LinkedIn accepts MP4 files for video ads. Use H.264 video codec and AAC audio codec for best compatibility. Maximum file size is 200 MB, and videos must be between 3 seconds and 30 minutes long.

How can I track ad performance across different formats?

Proper tracking setup is essential for measuring linkedin-advertising-roi. Install the linkedin-insight-tag-guide on your website to enable conversion tracking, retargeting, and demographic insights across all ad formats. Many businesses partner with a specialized linkedin-ppc-agency or best-linkedin-ad-agency to manage cross-format optimization and tracking.