This is super useful, Javier! My only comment would be that I am having trouble with the lack of contrast between the gridlines and the image, or the image and the background color. It is a little difficult for me to perceive the gridlines.
Hey Michale! Thanks for your comment! I updated the grid to have both a dark and a light line :D
Nice Stuff Like @Andreas H said this would make for an awesome Sketch plugin!
would be cool to have something like this in sketch.
larger images seem to get stretched?