# mupdf > MuPDF is a lightweight PDF, XPS, and E-book viewer. > More information: . - Open a PDF on the first page: `mupdf {{path/to/file}}` - Open a PDF on page 3: `mupdf {{path/to/file}} {{3}}` - Open a password secured PDF: `mupdf -p {{password}} {{path/to/file}}` - Open a PDF with an initial zoom level, specified as DPI, of 72: `mupdf -r {{72}} {{path/to/file}}` - Open a PDF with inverted color: `mupdf -I {{path/to/file}}` - Open a PDF tinted red #FF0000 (hexadecimal color syntax RRGGBB): `mupdf -C {{FF0000}}` - Open a PDF without anti-aliasing (0 = off, 8 = best): `mupdf -A {{0}}`