This free, open-source viewer for Windows supports multiple formats like PDF, eBooks (ePub, Mobi), CHM, and Comic Books (CBZ, CBR). Prioritizing simplicity and speed, it offers a lightweight, portable design with a minimalist interface, catering to users seeking fast and efficient document viewing.




SumatraPDF vs Adobe Acrobat Reader Comments
Sumatra does not support editing forms and adding annotations.
For me it is the best alternative to Acrobat Reader. Very light no fuss software that allows you to work on PDF files.

- SumatraPDF is Free and Open Source
- SumatraPDF is Privacy focused


























































It's nowhere as vulnerable to attacks as Adobe Reader, doesn't execute embedded JS, and renders documents blazingly fast