Plan frame dimensions for widescreen, vertical, square and ultrawide video, then estimate the crop before reframing footage.
Calculate a matching width or height and compare common video resolutions.
Calculate video dimensions → REFRAME FOOTAGEMeasure how much a landscape clip loses when converted to portrait, square or another shape.
Preview video crop → FIT THE FULL FRAMECalculate black bars, active picture size and a ready-to-copy FFmpeg scale-and-pad command.
Calculate video bars → CONVERT A SIZEGenerate proportional dimensions from a source ratio and one target side.
Convert dimensions → REFERENCECompare common dimensions for 16:9, 9:16, 1:1, 4:3 and 21:9.
Browse ratio guides →A common widescreen frame for web video, television and presentations.
A phone-first frame for stories, reels and short-form video.
A compact format that can work in feeds where horizontal space is limited.
Changing a ratio is not the same as changing resolution. A 16:9 source cannot fill a 9:16 frame without cropping, distortion or empty space.