SumatraPDF is an open-source Windows document reader for PDFs, eBooks, comics, DjVu, XPS, CHM, and images, designed for fast viewing, navigation, searching, printing, and everyday reference.
SumatraPDF is a lightweight Windows reader built to open PDFs and many other document formats without the overhead of a full office suite. It handles PDF, EPUB, MOBI, comic archives, DjVu, XPS, CHM, Markdown, plain text, SVG, and numerous image formats in one application. The interface keeps reading controls straightforward, while tabs, page navigation, text search, bookmarks, and keyboard commands support longer documents and repeated reference work. Its small footprint and open-source GPL licensing make it practical for home users, students, support staff, developers, and administrators who mainly need quick access to documents rather than editing or document-authoring tools.
SumatraPDF emphasizes viewing speed and direct navigation while still exposing advanced controls for users who need more than basic page turning. Documents can open in tabs or separate windows, and the command palette provides quick access to history, tabs, table-of-contents entries, favorites, thumbnails, and annotations. Command-line options support fullscreen or presentation launches, reusable instances, automated printing, and printer-specific settings for scripted workflows. Users who also document screen-based issues may pair the reader with Flameshot for capturing and marking visual evidence before sharing it. The application remains focused on reading and related document operations rather than replacing a full PDF editor.
SumatraPDF saves time when the main job is opening, reading, searching, and printing documents without waiting for a heavier productivity suite to load. Its broad format support reduces the need to keep separate viewers for PDFs, eBooks, comics, DjVu files, XPS documents, CHM help files, and common images. Tabbed reading helps users compare several documents within one window, while the command palette and keyboard-driven navigation make frequent actions easier to reach. Search, favorites, table-of-contents navigation, thumbnails, and annotation access improve work with long technical manuals, research material, and reference files. Command-line printing and launch options also make the reader useful in repeatable administrative or scripted workflows. Because the interface stays centered on viewing rather than complex editing, users get a focused environment with fewer controls competing for attention, while the open-source license supports straightforward installation in personal and organizational settings.
Key capabilities and highlights.
SumatraPDF opens far more than standard PDF files, including EPUB, MOBI, FictionBook, comic archives, DjVu, XPS, CHM, Markdown, plain text, SVG, and many image formats. Keeping these document types in one reader reduces application switching and gives users a consistent place to review mixed reference libraries.
Documents can open as tabs inside one window, allowing several manuals, reports, books, or reference files to remain accessible without creating a separate window for each. Advanced settings control tab use and instance reuse, while command-line options can override window behavior for particular launches or scripted workflows.
The built-in command palette gives keyboard-driven access to commands, recently opened files, tabs, page thumbnails, table-of-contents entries, favorites, and annotations. This centralized navigation is useful for users who work with long documents or many open files and want to reach common actions without repeatedly browsing menus.
SumatraPDF provides text search, page navigation, table-of-contents access, thumbnails, favorites, and history-based reopening for supported documents. These tools make lengthy manuals, specifications, research papers, and books easier to revisit because users can move directly toward relevant pages or previously referenced material instead of scrolling from the beginning.
The reader can work with PDF annotations and provides navigation commands for finding them in the current document. Version 3.6 also added controls to temporarily hide or show annotations. This helps when reviewing marked documents because users can inspect comments and highlights or temporarily clear them from view without changing the source file.
SumatraPDF supports command-line printing to the default printer or a named printer, with options for page ranges, duplex modes, paper sizes, scaling, trays, and multiple copies. Administrators and automation scripts can therefore send documents to print without manually opening the print dialog for every file.
Launch options can start documents in fullscreen or presentation view, providing a cleaner display when reading without interface distractions or showing pages to an audience. These modes are available from command-line arguments, making them useful for shortcuts, kiosks, repeat demonstrations, or workflows that need a predictable viewing state.
Many reading and navigation actions can be reached through keyboard shortcuts and named commands, reducing dependence on mouse-driven menus. Combined with the command palette, SumatraPDF supports efficient page changes, file switching, search, history access, and document navigation for users who prefer fast, repeatable keyboard workflows.
Browse historical releases and previous builds.
Common questions about SumatraPDF.
It supports PDF plus many additional formats, including EPUB, MOBI, FictionBook, CBZ and CBR comics, DjVu, XPS, CHM, Markdown, plain text, SVG, and numerous image formats. Some formats have specific limitations, such as encrypted eBook files not being supported.
Yes. The supplied and official project information identifies the software as GPL-3.0 licensed, so it is open-source software rather than a commercial or trial-only PDF reader.
Yes. Documents can open in tabs within a single window. Advanced settings control tab behavior and whether existing application instances are reused when additional files are opened.
Yes. Command-line options can print to the default or a named printer and accept settings for page ranges, duplex printing, scaling, paper size, printer trays, and copy counts. This is useful for automation and administrative workflows.
Version 3.6.1 was released on April 6, 2026 as a bug-fix release. The official release discussion states that the fixes mainly addressed rare crashes, while the version history summarizes the release as bug fixes.
SumatraPDF is an open-source Windows document reader for PDFs, eBooks, comics, DjVu, XPS, CHM, and images, designed for fast viewing, navigation, searching, printing, and everyday reference.
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