The recommended aspect ratio for LinkedIn video ads is square (1:1) or vertical (4:5) for feed placements on mobile, with landscape (16:9) as a solid fallback for desktop viewing and situations where you need one file to cover both. LinkedIn's ad system accepts a range of ratios, so the real question isn't "which one is allowed" — it's which one earns the most attention in a feed full of text posts, document carousels, and other video.
Why Aspect Ratio Matters More on LinkedIn Than You Think
LinkedIn's feed is built around a narrow, text-heavy column. A video that's wide and short gets squeezed into that column and shrinks, leaving a lot of dead space above and below the player. A taller video fills more of that vertical column, which means your product shot, headline, or face takes up more of the screen before anyone even taps to expand it.
This matters because most people scrolling LinkedIn on mobile are moving fast between posts, comments, and articles. A video that looks small or oddly framed reads as low-effort, even if the content inside it is strong. Choosing the right aspect ratio is a cheap way to make your ad look intentional before a single word of copy is read.
The Aspect Ratios LinkedIn Video Ads Support
LinkedIn's ad platform is flexible about aspect ratio compared to some other networks. In general terms, it accepts landscape, square, and vertical video within a defined range of width-to-height ratios. Rather than quote exact numeric limits here — which can shift — treat the table below as a practical starting map, and confirm the current minimum and maximum ratios in LinkedIn's own ad specs before you upload final files.
| Ratio | Typical use on LinkedIn | Strengths | Watch out for |
|---|---|---|---|
| 1:1 (square) | Feed ads, mobile-first campaigns | Fills more of the mobile column, consistent look across devices | Can feel cramped for wide product shots or multi-person scenes |
| 4:5 (portrait) | Feed ads aimed mainly at mobile | Takes up the most vertical space in-feed, strong for product close-ups | Top and bottom of the frame may get cropped in some surfaces |
| 16:9 (landscape) | Desktop-heavy audiences, webinar or demo-style ads | Matches how most video is shot and edited by default, works well for screen recordings | Shrinks noticeably in the mobile feed column |
| 9:16 (vertical) | Rare on LinkedIn; mainly reused Stories-style content | Full-screen if the surface supports it | LinkedIn's main feed isn't built around full vertical video the way TikTok or Reels is |
Square vs Vertical vs Landscape: When to Use Each
Square (1:1): the safe default
Square is a dependable choice if you're running one ad across a mixed audience of mobile and desktop viewers and don't want to produce multiple versions. It avoids the worst-case scenario of either format: it doesn't shrink as badly as landscape on mobile, and it doesn't get awkwardly cropped the way a tall vertical video can on a square-ish player.
Vertical (4:5): best for mobile-heavy campaigns
If your targeting skews toward mobile users — for example, a campaign aimed at a younger professional audience or one running mainly during commute hours — 4:5 is worth testing as your primary ratio. It gives your product, face, or key message the most real estate in the feed. Keep your most important visual and text inside the middle of the frame, since some surfaces may trim the top and bottom slightly.
Landscape (16:9): still relevant for desktop and demo content
B2B audiences on LinkedIn spend meaningful time on desktop, especially during work hours. If your ad is a product demo, a webinar clip, or anything with a screen recording, 16:9 often looks more natural because that's the native shape of most screens and software. It's also the easiest ratio to repurpose from existing explainer or demo videos you may already have.
Vertical (9:16): generally not the first choice
Full vertical 9:16 was built for apps where video takes over the entire screen, like TikTok, Reels, and Shorts. LinkedIn's feed experience doesn't work that way, so a 9:16 video often gets displayed inside a smaller frame with letterboxing, losing the full-screen effect. Unless you're specifically testing a format designed elsewhere and reusing the file, 9:16 is a lower priority for LinkedIn compared to square or 4:5.
How to Choose the Right Ratio for Your Campaign
- Check your audience device split. If you know (or can estimate) that your audience is mostly on mobile, lean toward 1:1 or 4:5. If it's a desktop-heavy B2B list, 16:9 is a safer bet.
- Match the ratio to the content. A talking-head or demo recorded in landscape rarely looks good forced into square — reshoot or re-edit rather than stretch or crop awkwardly.
- Design for sound off first. Put your main message in on-screen text or captions regardless of ratio, since a large share of feed scrollers won't turn sound on.
- Keep key elements centered. Whatever ratio you choose, avoid placing your logo, offer, or call to action too close to the edges — some surfaces crop slightly differently.
- Test one ratio against another with the same creative. Change the shape, not the message, so you can tell whether the ratio itself made the difference.
Common Mistakes to Avoid
- Uploading one landscape file and assuming it will look fine everywhere. It will play, but it may shrink more than expected on mobile.
- Cropping a vertical TikTok-style ad straight into a square without checking what gets cut off at the top and bottom.
- Treating aspect ratio as a one-time technical decision instead of something to test alongside hooks and offers.
- Forgetting captions. On any ratio, a muted scroll-past is common, and captions are often the difference between a skipped ad and a watched one.
Aspect Ratio Is One Piece of the Spec Puzzle
Aspect ratio works together with frame rate and resolution to determine how smooth and sharp your ad looks once it's live. If you've settled on a ratio, it's worth checking the other two before you export a final file. See our guides on the recommended frame rate for LinkedIn video ads and the recommended resolution for LinkedIn video ads for the full picture. If you're also running the same campaign on Meta, our breakdown of the recommended aspect ratio for Facebook feed ads is a useful comparison point.
How FrameNotion Fits
If you're building a LinkedIn ad from scratch and don't want to manage multiple exports by hand, FrameNotion can help with the production side. You paste a product or website link, and FrameNotion AI writes and renders a 30-second ad built around a hook, problem, benefit, proof, and call to action — no templates. The main output is a 9:16 vertical MP4 made for TikTok, Reels, Shorts, and Meta placements, and every ad also comes bundled with 4:5, 1:1, and 16:9 versions, which covers the square and portrait shapes that tend to work best on LinkedIn's feed.
Each ad ships with an AI voiceover, a music track, sound effects, and word-by-word captions, or you can choose music-only or silent — useful since so much of the LinkedIn feed gets scrolled with sound off. If you later want to adjust the copy or colors, you can request changes without starting a new ad. You can see finished examples on the examples page, and the first ad is free to try — check pricing for plan details once you're ready to make more.
FAQ
Frequently asked questions
Can I run the same video ad in multiple aspect ratios on LinkedIn?+
Yes. Many advertisers upload more than one version of the same ad — for example a square and a landscape cut — and let the campaign serve whichever fits the placement best. Having a few ratios ready also makes it easier to react if your audience's device mix shifts.
Does LinkedIn crop or letterbox video ads automatically?+
Depending on the ratio you upload and the surface it appears in, LinkedIn may add letterboxing (bars) or crop slightly to fit the player. Keeping important text and visuals away from the extreme edges reduces the risk of losing key content.
Is vertical 9:16 ever worth using on LinkedIn?+
It can be, mainly if you're reusing a vertical ad you already built for TikTok or Reels and want to test it on LinkedIn at low cost. It's not usually the strongest first choice, since LinkedIn's feed isn't designed around full-screen vertical video.
Should B2B video ads look different from consumer ads in terms of ratio?+
The ratio choice mainly depends on where your audience is watching (mobile vs desktop), not on whether the product is B2B or consumer. A B2B audience that's mostly on mobile during commute hours still benefits from square or portrait formats.
What's a good first step if I only have time to make one version of my ad?+
Start with square (1:1). It holds up reasonably well on both mobile and desktop and avoids the most extreme shrinkage or cropping issues you'd see with a single landscape or vertical file.