LinkedIn Ad Specs and Dimensions 2026

LinkedIn is where professional credibility is everything — and nothing undermines it faster than an ad that looks sloppy, stretched, or poorly formatted. With a unique mix of ad formats spanning Sponsored Content, Carousel Ads, Message Ads, Dynamic Ads, and Text Ads, each with their own precise requirements, the margin for error is surprisingly slim. This cheat sheet brings every LinkedIn ad dimension, file size, aspect ratio, and character limit together in one clean, scannable reference — so every campaign you run looks as sharp and professional as the audience you're trying to reach.

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