The Ultimate Guide to LinkedIn Ad Sizes and Specs

Running successful campaigns on LinkedIn requires more than just a strong hook and precise targeting. If your creative assets don’t fit the platform’s exact technical requirements, they can look pixelated, get awkwardly cropped, or—worst of all—get rejected by LinkedIn’s review system.

Whether you are launching a brand awareness campaign or driving B2B lead generation, this guide breaks down the essential dimensions and specs for every major LinkedIn ad format.

1. Single Image Ads (Sponsored Content)

Single image ads live right in the professional feed, making them one of the most versatile ways to grab attention. LinkedIn supports three distinct aspect ratios for single image posts:

| Treatment | Recommended Resolution | Aspect Ratio | Where It Shows |
| :— | :— | :— | :— |
| Square | 1200 × 1200 px | 1:1 | Desktop & Mobile |
| Landscape | 1200 × 628 px | 1.91:1 | Desktop & Mobile |
| Vertical | 720 × 900 px | 4:5 | Mobile Only |

• File Formats: JPG, PNG, or GIF (non-animated)
• Max File Size: 5 MB
• Text Limits: Intro text (150 characters recommended for mobile truncation), Headline (70 characters).

2. Carousel Ads

Carousels let you tell a step-by-step story, showcase a product line, or feature multiple data points using a swipeable sequence of cards.

• Card Resolution: 1080 × 1080 pixels (Square 1:1 ratio is strongly recommended for consistency).
• Card Count: 2 to 10 cards per ad.
• Max File Size: 10 MB per card.
• File Formats: JPG or PNG.
• Text Limits: Card headline max 45 characters; introductory text max 255 characters.

3. Video Ads

Video is a powerhouse for building trust and demonstrating complex B2B solutions. LinkedIn supports multiple orientations depending on your creative style:

• Square (1:1): Up to 1920 × 1920 px
• Vertical (4:5): 720 × 900 px (Recommended for feed performance)
• Vertical (9:16): 720 × 1280 up to 1080 × 1920 px
• Landscape (16:9): 1920 × 1080 px

Quick Video Specs:

• Format: MP4
• File Size: 75 KB to 500 MB
• Duration: 3 seconds up to 30 minutes (shorter, punchier clips usually yield better completion rates).

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

Desktop users frequently see smaller, highly targeted ad units tucked away on the right-hand side of the screen.

• Text Ads: Feature a tiny 100 × 100 px logo/image, a headline (max 25 characters), and a description (max 75 characters).
• Spotlight Ads: Personalize the ad using the user’s profile picture alongside a company logo (100 × 100 px). They can also include an optional background image of 300 × 250 pixels.

5. Message and Conversation Ads

Delivered directly to a user’s LinkedIn Messaging inbox, these interactive ads drive high intent through direct dialogue.

• Companion Banner (Optional): If you include a desktop banner, it must be 300 × 250 pixels (JPG, PNG, or static GIF, max 2 MB).
• CTA Button: Maximum 25 characters.

Pro-Tips for Flawless LinkedIn Ad Delivery

1. Keep Critical Text Centered: Avoid placing key text or logos too close to the edges where platform UI elements or cropping might cut them off.
2. Watch Your File Sizes: While LinkedIn allows up to 5 MB for single images, compressing your files slightly below that threshold ensures faster loading speeds and smooth delivery.
3. Preview Before You Push Live: Always use LinkedIn’s Campaign Manager preview tool to test how your creative appears across both desktop monitors and smaller mobile screens.