Sumatra PDF

From the perspective of PDF reading alone, it is portable, supports different keyboard shortcuts, and provides various viewing modes such as single page, book and demonstration. In addition, it also provides functions such as custom profile, watermarking and merging. Its function is not rich, but it is better than excellent free reading experience.

Fast PDF editor

The domestic PDF editor software with multiple functions and language matching is completely free to use as a reader. Ordinary users support the editing, merging and splitting functions of PDF files for free, and the downloaded files will be watermarked. There is a need to edit PDF files, and you can try this software in pursuit of cost performance.

PDF-XChange

A versatile and excellent PDF editor, which supports the functions of creating, viewing, adding comments, recording/attaching audio and files, highlighting text and arranging word by word. Reading function is free, and some functions are member content. In the free version, the downloaded file will be watermarked with the product.