Screenshot Framer draws a device frame on iPhone and iPad screenshots. Features include

• 4 frame types: iPhone and iPad, with or without home button
• 120 frame colors (from Keynote palette; screenshot below)
• Portrait and landscape (90° counterclockwise only)
• Option to use black bezel
• Option to reduce final image size
• Draws frames using mask, overlay, resize, rotate, flip actions
• Small shortcut size because it does not contain device photos

Notes:

• Running directly in the Shortcuts app is faster than sharing from Photos or Files.
• Although it supports images of any size, unscaled and uncropped screenshots produce best results.
• iOS does not seem to recognize transparency of small (360 or less pixels in width or height) PNG images. They look fine on a computer.