GUIDE深度 · Deep dive
Aspect Ratio Basics: 16:9, 4:3, 9:16
Aspect ratio describes shape; resolution describes pixel count. 16:9 can be 1280x720, 1920x1080 or 3840x2160; 9:16 is vertical. Fitting 16:9 footage into 9:16 crops or adds bars; it does not magically become vertical.
16:9: YouTube/web/TV.
9:16: TikTok/Reels/Shorts.
4:3: older slides/photos.
1:1: avatars/product shots.
Crop: fills the frame but loses edges.
Pillarbox/letterbox: keeps everything but adds bars.
Reshoot/re-layout: vertical content is best captured natively.
FAQ
Does scaling blur?
Upscaling does; down-then-up also loses detail. Export from a high-resolution source.
Can I remove bars?
Crop or change ratio; you cannot invent missing image.