I was trying to figure out what is the size of A4 paper in pixels to design a printable presentation so here is what i found …
A4 is 210 x 297mm.
If it is to print on a standard low cost printer, use 72 pixels per inch in resolution: set your image 595 x 842 pxls, 72px/inch
for a better result, use 150px/inch and an image of 1240 x 1754 px.
For professional results (ie a brochure), use 300px/inch and an image of 2480 x 3508 px.
px = Pixels