Though keep in mind that a given PDF might not embed the font that it uses (the PDF creator might not even have the legal right to embed whatever font they're u

Though keep in mind that a given PDF might not embed the font that it uses (the PDF creator might not even have the legal right to embed whatever font they're using), so opening a PDF on other machines can cause them to be messed up if those machines don't have the correct fonts installed. If you want literally pixel-perfect layout, you need to use a raster image format like PNG.