How do I print a coloring page so it fills the paper?
Download the PDF in your paper size (US Letter or A4), open it, and print at 100% or "Actual size". Each PDF already has margins built in, so nothing gets cut off.
Every page comes as two PDFs: US Letter (8.5 × 11 in, used in the US and Canada) and A4 (210 × 297 mm, used almost everywhere else). Pick the one that matches the paper in your printer.
In the print dialog, choose "Actual size" or "100%". "Fit to page" also works, but it can shrink the drawing a little. If your printer leaves a white band on one side, that is the printer's own unprintable margin, and the drawing is placed to stay clear of it.
Printing from a phone works the same way: open the PDF, tap Share, then Print. On an iPhone, AirPrint printers show up there automatically.
