The Ultimate Guide to LinkedIn Ad Sizes and Specs

Running high-performing B2B campaigns requires more than just a clever pitch and a strong target audience—it demands pixel-perfect execution. Upload an image that is slightly too large, or a video with the wrong aspect ratio, and LinkedIn will compress, crop, or outright reject your creative.

To help you protect your budget and maximize engagement, this complete guide breaks down the essential dimensions, formats, and limits for LinkedIn ads.

1. Single Image Ads (Sponsored Content)

Single image ads are the backbone of most LinkedIn strategies, showing up directly in the professional feed. They support three primary aspect ratios:

• Landscape (1.91:1): 1200 x 628 pixels (Best for universal desktop and mobile delivery)
• Square (1:1): 1200 x 1200 pixels (Great for balanced visual weight on mobile)
• Vertical (4:5): 720 x 900 pixels (Mobile-optimized, takes up valuable vertical real estate)
• File Requirements: JPG, PNG, or GIF; maximum 5 MB.

2. Carousel Image Ads

Carousel ads let you showcase a sequence of up to 10 cards, making them ideal for step-by-step guides, product feature breakdowns, or multi-part thought leadership stories.

• Card Size: 1080 x 1080 pixels (1:1 aspect ratio)
• File Requirements: JPG, PNG, or non-animated GIF; maximum 10 MB per card.

3. Video Ads

Video is one of the most effective ways to capture attention in a text-heavy professional feed. LinkedIn supports four major aspect ratios depending on your creative style:

• Landscape (16:9): 1920 x 1080 pixels
• Square (1:1): Up to 1920 x 1920 pixels
• Vertical (4:5): 720 x 900 pixels (Recommended for mobile feeds)
• Vertical (9:16): 720 x 1280 to 1080 x 1920 pixels
• File Requirements: MP4 format, file size between 75 KB and 500 MB, and length ranging from 3 seconds to 30 minutes.

4. Thought Leader & Document Ads

• Document Ads: Allow you to share native PDFs, PowerPoint (.ppt/.pptx), or Word (.doc/.docx) files directly in the feed. Max file size is 100 MB (up to 300 pages).
• Thought Leader Ads: Amplify organic posts from real executives and employees to build authentic brand trust. Ensure underlying images match standard single-image specs.

5. Messaging & Conversation Ads

Direct-to-inbox ads deliver high response rates when kept conversational and concise.

• Desktop Banner Image (Optional): 300 x 250 pixels (JPG or PNG, max 2 MB). Note that this banner only renders on desktop views.
• Sender Image: LinkedIn automatically pulls the designated sender’s native profile picture.

6. Text, Spotlight, and Follower Ads

These smaller, high-intent units typically live on the right rail of the desktop experience.

• Text Ads: Require a small 100 x 100 pixel logo (JPG/PNG, max 2 MB) paired with a tight headline (25 characters) and description (75 characters).
• Spotlight & Follower Ads: Use a 100 x 100 pixel company logo. Spotlight ads also support an optional 300 x 250 pixel custom background image.

💡 Pro-Tip for Marketers: Always preview your ads using LinkedIn’s campaign manager test tool before launching. Double-checking text overlays against safe zones ensures that crucial elements like your call-to-action button or logo aren’t obscured by UI overlays on mobile devices.