SumatraPDF

SumatraPDF is a free and open-source software application designed for viewing PDF files and other document formats like ePub, MOBI, and XPS. It is known for its speed and simplicity, making it easy to navigate and read documents without unnecessary features or distractions. SumatraPDF is lightweight, meaning it doesn't take up much space on your computer and launches quickly. It is particularly favored by users who want a straightforward, no-frills option for reading digital documents without the complexities of more advanced software.