Glossary · format
Aspect Ratio
Also known as: video aspect ratio, image aspect ratio
Definition
Aspect ratio is the proportional relationship between the width and height of an image or video, expressed as W:H (16:9 widescreen, 9:16 vertical, 1:1 square, 4:5 portrait, 2.39:1 cinematic).
In more detail
Choosing the right ratio matters for platform fit: 16:9 for YouTube and landscape ads, 9:16 for TikTok/Reels/Shorts, 1:1 for Instagram feed, 4:5 for Instagram portrait. Mobbi auto-applies platform-correct ratios when you generate from a use-case page like /ai-video-for-tiktok.
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FAQ
What aspect ratio for TikTok ads?+
9:16 vertical. TikTok Ads Manager also accepts 1:1 but performance is materially worse than 9:16 native.