There is no PDF document that cannot be opened for viewing with a reader or viewer. There are many PDF readers to choose from, and more and more are paid now. If you want to avoid paying for software, Speedpdf Reader is a good free PDF reader for you.

A slick PDF reader…

The app has a simple and beautiful UI interface, and intuitive toolbar. You can select or drag a PDF document to open it directly. If the app has defaulted, you can also double-click to open the document directly. Supports loading multiple files at the same time and displaying them on the tab bar, similar to how Google Chrome operates.

The app loads documents very quickly and loads multiple documents without stuttering. After the document is loaded, you can zoom in and out at will, turn pages back and forth, rotate left and right, and jump to page numbers; it also supports functions such as search, thumbnail, full screen, slideshow, single and double page reading mode, book mode, and incognito browsing mode; It also supports function shortcut keys for operation.

The app also provides changing background themes: a total of 5 background colors. To avoid eye strain when you read or view content for too long with the default background color, you can switch to other more eye-friendly background colors, including night mode.

In addition to supporting PDF format, this app also supports: eBook (epub/mobi), comic book (cbz/cbr), TXT, DjVu, XPS, CHM, Image format for reading.

...and PDF Annotator more