Preview a window on your photo.
Pick a family, set real dimensions, drag the corners onto the opening. The window is rebuilt in perspective and blended into the photo.
Prototype - Sample imageJPG, PNG or WebP up to 20 MB. It stays in your browser and is never uploaded.
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Drag the 4 orange corners to the opening.
Opening check
The size you entered matches the opening you marked (within about 13%).
Estimated from perspective only. Oblique or cropped photos give a wide error band.