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Sumatra PDF

Lightweight open-source reader for PDF, EPUB, MOBI, comics and more on Windows

Open source (GPL-3.0-only) Windows

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Just the program: no ads, no bundled offers, no account needed.

About

Sumatra PDF is a small, free and open-source document reader for Windows created by Krzysztof Kowalczyk. Besides PDF it opens EPUB and MOBI e-books, FictionBook, XPS, DjVu, CHM help files and CBZ/CBR comic archives, as well as common image formats. It concentrates on quick start-up and distraction-free reading rather than editing, with a minimal interface, tabs, extensive keyboard shortcuts and a command palette for finding functions. A portable version runs as a single executable without installation or registry changes, which suits USB drives and locked-down PCs. Simple PDF annotations are supported, but it is not meant for changing page content. The project states that it carries no ads, bundled software or subscriptions, and it offers 64-bit, 32-bit and ARM64 builds for Windows 7 to 11.

Reads PDF, EPUB, MOBI, FB2, XPS, DjVu, CHM and CBZ/CBR
Portable single-file version with no installation
Tabs, keyboard shortcuts and a command palette
Basic PDF annotations

Before you download

Windows only; Windows XP and Vista users need the older 3.1.2 release (the ARM64 build needs Windows 10 or 11).
A reader rather than an editor: it does not modify PDF page content.

What it looks like

Screenshot of Sumatra PDF — Screenshot from Wikimedia Commons, free licence — the file page names the author and the licence.

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