Sumatra PDF is a free program that open various types of documents, including PDF, DjVu, ePub and a few more. It has a portable version that does not require any installation, is starting fast and has an intuitive interface, without advertisements or third party components.
1. Fast PDF opening
I was surprised by how fast this program can open a PDF file. There are no delays and you can view the document’s content immediately after double clicking on it (you can set Sumatra PDF Viewer as default program to open PDF files, at the installation).
2. Full screen and rotate
3. Useful Search feature
4. Easy zoom
5. Few printing options
If you wish to print document, this program does not offer too many options and customizations. Anyway, you can fit pages to printer or use original size.