Right size: 1080×1920
Reels accepts only 9:16 vertical. 1080×1920 is the optimal resolution. Square (1:1) uploads get cropped poorly.
Optimal length: 7–9 seconds
Reels' algorithm optimizes for completion rate. 7–9-second videos hit the highest completion. Don't go over 15 seconds; 30-second videos rarely go viral.
Hook in the first second
TikTok's 3-second rule shrinks to 1 second on Reels. Unexpected motion, color burst or a question — it must be in the first frame.
Cover image
In the Reels feed, the cover drives 40% of clicks. Auto-selected covers are usually weak. Manually upload a cover, center the product, add a bold title.