9:16 Aspect Ratio Calculator + Bulk Resizer
Work out any 9:16 dimension, then resize or crop a whole folder of images to match — free, in your browser.
Work out any 9:16 dimension, then resize or crop a whole folder of images to match — free, in your browser.
The 9:16 aspect ratio is the vertical video standard, essentially 16:9 rotated 90 degrees. It has become the dominant format for mobile-first content on platforms like TikTok, Instagram Reels, YouTube Shorts, and Stories. This tall, portrait orientation fills the entire screen on smartphones held vertically.
TikTok, Reels, and Shorts all read the same 9:16 frame, so one export covers all three. Keep captions and logos inside the middle 80% — each app overlays its own UI on the top and bottom edges, and that is where text goes to die.
The native format for TikTok videos that fills the entire screen
Full-screen vertical content for maximum engagement
YouTube's short-form vertical video format
Vertical ads optimized for smartphone viewing
1080x1920 is the standard, and it is what TikTok, Reels, Shorts, Stories and Snapchat all expect. Any width that divides by 9 works: 360x640, 540x960, 720x1280, 1080x1920, 1440x2560, 2160x3840. Multiply the width by 16 and divide by 9 to get the height.
No, though it gets listed as 9:16 constantly. The iPhone 6/7/8 screen is 375:667, which works out to 0.5622 against a true 9:16 of 0.5625. The gap is small enough that nobody notices on a phone, but it is not an exact 9:16 frame. 720x1280 is the nearest size that is.
1080x1920 pixels is the recommended resolution for TikTok. This provides Full HD quality in the 9:16 vertical format. TikTok will accept other resolutions but may crop or add black bars.
Yes! 9:16 is simply 16:9 turned on its side. If you have a 1920x1080 (16:9) video, rotating it gives you a 1080x1920 (9:16) frame. The math is identical, just with width and height swapped.
Most people hold their phones vertically most of the time. Vertical video fills the entire screen without requiring rotation, creating a more immersive, full-screen experience. Studies show vertical videos have higher completion rates on mobile.
Yes, but you'll lose significant content. You can either crop (losing the sides), add blur/color bars on top and bottom, or use AI tools to expand the frame. The best approach depends on your content.
Most platforms accept 24-60fps. TikTok and Instagram Reels work best at 30fps. YouTube Shorts supports up to 60fps. Higher frame rates (60fps) are good for action content but increase file size.