Using the wrong LinkedIn ad sizes leads wastes ad spend on ads that look unprofessional. LinkedIn supports several aspect ratios and image dimensions across its ad formats, and each format has different requirements.
I have created hundreds of LinkedIn ads for ABM campaigns and learned the hard way which sizes work best on mobile vs. desktop. This guide covers every LinkedIn ad size you need in 2026 – organized by ad format so you can quickly find the right dimensions for whatever you are building.
Here are all LinkedIn ad sizes in one table. Bookmark this for quick reference when building ads:
| Ad Format | Recommended Size | Aspect Ratio | File Types | Max Size |
|---|---|---|---|---|
| Single Image (horizontal) | 1200 x 627 px | 1.91:1 | JPG, PNG, GIF | 5 MB |
| Single Image (square) | 1200 x 1200 px | 1:1 | JPG, PNG, GIF | 5 MB |
| Single Image (vertical) | 1200 x 1500 px | 4:5 | JPG, PNG, GIF | 5 MB |
| Carousel (per card) | 1080 x 1080 px | 1:1 only | JPG, PNG | 10 MB |
| Video (landscape) | 1920 x 1080 px | 16:9 | MP4, MOV | 5 GB |
| Video (square) | 1080 x 1080 px | 1:1 | MP4, MOV | 5 GB |
| Video (vertical) | 1080 x 1350 px | 4:5 | MP4, MOV | 5 GB |
| Text Ad | 100 x 100 px | 1:1 | JPG, PNG | 2 MB |
| Spotlight Ad (logo) | 100 x 100 px | 1:1 | JPG, PNG | 2 MB |
| Spotlight Ad (background) | 300 x 250 px | 6:5 | JPG, PNG | 2 MB |
| Message Ad (banner) | 300 x 250 px | 6:5 | JPG, PNG, GIF | 2 MB |
| Event Ad | 1200 x 627 px | 1.91:1 | JPG, PNG | 5 MB |
Single image ads support three aspect ratios. The size you choose affects how much screen space your ad occupies, especially on mobile:
The traditional LinkedIn ad size. Works well on desktop but takes up less vertical space on mobile compared to square or vertical images.
My recommended LinkedIn ad size for most campaigns. Square images take up more screen space on mobile, which is where 57% of LinkedIn users browse. This leads to higher visibility and typically better CTR.
The largest ad size available for single image ads. Vertical images dominate the mobile feed and are ideal for content-heavy creatives. LinkedIn introduced this size to compete with Instagram and TikTok ad formats.
My recommendation: Use 1200 x 1200 (square) as your default LinkedIn ad size. It is the best compromise between mobile visibility and creative flexibility. Use 1200 x 1500 (vertical) when you have content-heavy creatives or want maximum mobile screen real estate.
For creative best practices: LinkedIn Single Image Ads Best Practices for ABM
LinkedIn video ads support the same three aspect ratios as image ads. The best size depends on your content and target device:
| Orientation | Size | Aspect Ratio | Best For |
|---|---|---|---|
| Landscape | 1920 x 1080 px | 16:9 | Product demos, webinar clips, interviews |
| Square | 1080 x 1080 px | 1:1 | Social-style videos, talking head clips, animations |
| Vertical | 1080 x 1350 px | 4:5 | Mobile-first campaigns, short-form content |
Technical requirements: MP4 format recommended, 5-10 Mbps bitrate, 30 fps. Maximum file size is 5 GB, maximum duration is 10 minutes (15-30 seconds recommended for ads).
Carousel ads have a strict requirement: every card must be exactly 1080 x 1080 pixels (1:1 square). There is no option for horizontal or vertical carousel cards.
Design tip: When designing carousel cards, leave a 50px safe zone at the bottom of each card. The card headline overlaps slightly on some devices. Also consider that users see about 1.5 cards at a time on mobile – design the first card to create curiosity that drives swiping.
Document ads display a PDF preview in the feed. The size depends on your document layout:
Design tip: Use 18pt+ font sizes in your documents. The in-feed preview shows pages at a small size, so text needs to be readable without zooming. Bold headlines and large graphics work much better than dense text.
Text ads and spotlight ads use small images that appear in the LinkedIn sidebar:
These LinkedIn ad sizes are small, so use simple, high-contrast logos or icons. Do not try to include text in a 100 x 100 image – it will not be readable.
Based on performance data from ABM campaigns tracked in ZenABM, here is my recommendation:
| Goal | Best Ad Size | Why |
|---|---|---|
| Maximum mobile visibility | 1200 x 1500 (vertical) | Largest screen area on mobile |
| Best all-around performance | 1200 x 1200 (square) | Good on both mobile and desktop |
| Desktop-focused campaigns | 1200 x 627 (horizontal) | Traditional format, works on desktop |
| Storytelling / multi-card | 1080 x 1080 (carousel) | Only option for carousel |
| Video content | 1080 x 1080 or 1080 x 1350 | Square or vertical for mobile |
| Low-cost awareness | 100 x 100 (text ads) | Sidebar placement, very low CPM |
The best LinkedIn ad image size is 1200 x 1200 pixels (square). It offers the best balance between mobile visibility and creative flexibility. For mobile-heavy campaigns, consider 1200 x 1500 pixels (vertical) for maximum feed presence.
LinkedIn carousel ad cards must be exactly 1080 x 1080 pixels (1:1 square ratio). This is the only supported size – horizontal and vertical images are not available for carousel cards. Each card can be up to 10 MB in JPG or PNG format.
LinkedIn video ads support a maximum file size of 5 GB. Use MP4 format with 5-10 Mbps bitrate and 30 fps. Recommended resolution is 1920 x 1080 pixels (landscape) or 1080 x 1350 pixels (vertical). Maximum duration is 10 minutes.
LinkedIn uses the same image file for both mobile and desktop, but the display differs. Square (1:1) and vertical (4:5) images take up more space on mobile screens, resulting in higher visibility and typically better engagement rates. This is why I recommend square images as the default ad size.
