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Despite 80% of LinkedIn usage occurring on mobile devices, A/B ad tests reveal that traditional wide (16x9) videos outperform vertical and square formats. They generate higher engagement, watch time, and completion rates, possibly because the format does not obscure the platform's like and comment buttons.

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Contrary to past advice, recent data shows LinkedIn videos perform better with short, concise captions. The platform's UI creates 'context switching' friction between watching a video and reading long text, making brief captions paired with on-screen text more effective for earning likes.

An 800x999 pixel image on LinkedIn takes up the entire mobile screen, eliminating competition from other posts. This increases scroll time on your content, giving it a higher chance of engagement by making it the sole focus for the user.

The "Walk & Talk" video format—simply walking while talking to your phone—is being championed by LinkedIn's leadership. This authentic style counters AI-generated content and sees engagement rates 41% higher on personal pages and 72% higher on company pages, creating a more genuine connection with audiences.

Contrary to the recent push for video-first strategies, Digiday data shows LinkedIn video views are declining. The platform is now oversaturated with video, causing a performance dip. This suggests marketers should diversify back to previously effective formats like carousels and text-with-image posts to stand out.

Heike Young outlines a specific formula for high-performing LinkedIn videos. Success requires an integrated approach: a text title superimposed on the video, clear captions, a strong visual hook in the opening seconds, and a compelling hook in the accompanying text post to grab attention in the feed.

Unlike other ad platforms, LinkedIn offers no desktop-only targeting, meaning up to 90% of ad impressions are served on mobile devices. This technical constraint necessitates that all creative, copy, and landing pages be designed for a mobile-first experience, a detail many B2B marketers miss.

To maximize engagement, size your LinkedIn images to 800x999 pixels. This specific ratio takes up the entire mobile screen, eliminating competing posts from view and increasing the user's scroll time on your content, which significantly boosts the chances of interaction.

The inclusion of a 'watch on widescreen' option in Instagram's TV app is a significant strategic shift. It suggests Instagram is encouraging horizontal video to compete directly with YouTube on televisions, creating an opportunity for creators who focus on landscape formats.

On LinkedIn, behind-the-scenes (BTS) video content significantly outperforms other formats, achieving a 200% higher engagement rate. This lo-fi approach, showing how products are made or offering glimpses into company culture, resonates strongly with the platform's professional audience, regardless of industry.

To better capture attention in the mobile feed, favor vertically-oriented photos over horizontal ones. Vertical images, such as a standard smartphone photo, occupy more screen space as users scroll, making your post more prominent and increasing the chance of stopping the scroll.