Video Aspect Ratios Explained
Generating the wrong aspect ratio for a platform costs you engagement. Here's what you need to know before you generate.
16:9
Landscape
YouTube, desktop, presentations
Standard widescreen the default for most generators including Gemini Omni
9:16
Vertical
TikTok, Reels, YouTube Shorts
Full-screen vertical specify "vertical 9:16" in your prompt
1:1
Square
Instagram feed, LinkedIn
Works across both landscape and portrait contexts without letterboxing
How to specify aspect ratio in your prompt
Gemini Omni defaults to 16:9. To generate other ratios, include the aspect ratio in your prompt:
"... vertical 9:16 format for TikTok ..." → Vertical output "... square 1:1 format for Instagram ..." → Square output "... cinematic 2.39:1 anamorphic widescreen ..." → Ultra-wide (letterboxed)