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SumatraPDF is a free open-source lightweight document viewer supporting PDF, EPUB, MOBI, XPS, DjVu and more. Designed for Windows, it is small, fast-starting and low on resources, ideal for everyday document reading.

Adobe Acrobat Reader is the free standard PDF viewer for opening, printing, filling forms, signing, annotating, and sharing PDF documents. Available as desktop software for Windows and macOS, plus mobile apps.