Free tool
Right size,wrong picture.
Type a resolution, get a frame with that resolution printed in the middle.For blocking out a video or a template before the real artwork exists.
Resolution
The number in the middle of the image is exactly what you type here.
Sits above the resolution, and names the downloaded file.
Guides
Corner-to-corner diagonals mark the true centre — handy when you're eyeballing alignment in an edit.