## Why 9:16 Vertical Video Rules the Algorithm
Over 85% of mobile social commerce happens in full-screen vertical formats. Algorithms on TikTok, Instagram Reels, and YouTube Shorts ruthlessly penalize horizontal letterboxed content.
To maximize conversion, e-commerce video ads must follow strict architectural rules:
1. **Safe-Zone Compliance**: Keeping logos and call-to-actions out of UI overlay zones (bottom 20% for TikTok caption/audio titles, right 15% for interaction buttons).
2. **Sub-3-Second Hook**: Visual motion in the opening 1.5 seconds to stop the thumb scroll.
3. **Sound-On Optimization**: Synchronized voiceover with dynamic audio ducking over royalty-free commercial tracks.
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