Free browser tool
Free video aspect ratio calculator
Enter a source resolution and calculate crop or padding dimensions for vertical, square, portrait, and widescreen video.
Aspect ratio calculator
Calculate crop and padding for social video
Convert horizontal, square, and vertical dimensions into platform-ready ratios before you edit.
Current ratio
16:9
Target ratio
9:16
Center crop
608 x 1080
Crop note
Trim width to fit 9:16
Padding canvas
1920 x 3413
Caption tip
Keep captions near the center band
Plan the crop before captions and export
Aspect ratio mistakes often push captions into platform UI or cut off the subject. Use this calculator before styling captions or rendering social clips.
Free tool FAQ
What aspect ratio should I use for TikTok, Reels, and Shorts?
Use 9:16 for full-screen vertical feeds. A common export size is 1080 x 1920, with important captions kept away from top, bottom, and right-side interface areas.
Does this calculator edit my video?
No. It calculates crop and padding dimensions only. Use the numbers as planning guidance before editing or exporting.