Vertical 9:16 safe zone guide
Check whether a size is vertical 9:16, find the nearest 9:16 crop, and preview a conservative safe box so your subject stays clear of overlaid interface. It runs in your browser and costs nothing.
- Safe size
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- Top / bottom inset
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- Side inset
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How to use it
- Pick a preset, or type a custom width and read the computed 9:16 height.
- Enter any width and height to check the ratio and see the nearest 9:16 crop.
- Adjust top, bottom and side margins to match where you post.
- Read the safe box pixel values and keep your subject inside the box.
- Use the scaled preview to eyeball the composition.
Questions
What counts as 9:16?
A size is 9:16 when width ÷ height equals 9 ÷ 16 (0.5625). For example 1080 × 1920 and 720 × 1280 are both exactly 9:16. The checker tells you whether a size matches and, if not, the nearest 9:16 crop.
Where do the safe-zone margins come from?
The default 14% top, 20% bottom and 6% sides are a conservative rule of thumb for keeping important content clear of overlaid UI. They are not an official spec from any platform — adjust them to match where you plan to post, and leave headroom.
Why keep things inside the safe box?
Short-form apps lay captions, handles, buttons and progress bars over the edges of a vertical video. Keeping your subject and any text inside the safe box means it stays visible after that interface is drawn on top.
Does this tool send my sizes anywhere?
No. The checker and preview run entirely in your browser. Nothing is uploaded, and it is free to use.