6 Best Free Open Source Document Viewer Software For Windows

Here is a list of Best Free Open Source Document Viewer Software For Windows. These are the document reading software that you get for free with their source code. You can study, analyze, and modify the source code of these document viewers without any restrictions.

In these viewers, you can view documents of wide number of formats. Some of the commonly supported document formats including DOC, DOCX, RTF, TXT, and PDF. Many of these also support eBooks and comic formats to import and view, such as FB2, EPUB, DjVu, CBZ, MOBI, etc. You can also view spreadsheets, presentations, and images in a few of these software. Talking about features, these provide all standard viewing tools that are essential to view documents. These tools include zoom, rotate, search, page navigation buttons, and go to features. In some software, you can also find bookmarks, table of content, and navigator (to view individual elements of document) options.

A few software also provide fullscreen mode (distraction-free), night mode, preference customization, and some more features that offer a good  document reading environment. In general, these open source document viewers are quite feature packed with clean and user-friendly GUI. You can go through the list to know more about these software.

My Favorite Open Source Document Viewer Software For Windows:

LibreOffice is one of my favorites as it supports different document types including text document, spreadsheet, presentations, PDF, etc. For each of these document types, it supports a lot of file formats that you can view in it. Not just view, you can also edit documents using different applications of this office suite.

I also like Cool Reader. It is quite a good software to view eBooks of various formats. Plus, it comes in a portable package.

You may also like some best free Open Source eBook Reader, Open Source Document Management Software, and Open Source Office Suites for Windows.


LibreOffice is a free open source document viewer software for Windows, Linux, and Mac. It is primarily a popular office suite which is used as a free alternative to Microsoft Office. It contains a set of applications which help you process different types of documents including text document, spreadsheets, presentations, drawings, etc. You can also use it to view several supported documents. Let’s check out what are the documents that you can view in it and what are the features it provide you to view document files.

Key Features:

  • It supports a wide number of file formats which range from simple text document to spreadsheets and presentation files. Also, it lets you view PDF document. Some of its supported input document formats include ODT, DOC, DOCX, RTF, TXT, XLS, XLSX, CSV, DIF, ODS, PPT, PPTX, PPS, ODP, etc.
  • You can also view images in its LibreOffice Draw application.
  • It provides normal and web view modes, zoom options, fullscreen mode, and more features to view documents.
  • You can also disable edit mode to view document in Read-Only Mode.
  • It offers a handy Navigator tools that enables you browse through different elements of a document such as text section, tables, references, comments, hyperlinks, etc.

Additional Features:

It is a feature rich office software with applications like LibreOffice Writer, LibreOffice Calc, LibreOffice Impress, LibreOffice Draw, etc. Each of these provides a variety of tools to process different document types such as Document Editing and Formatting Features, Document Encryption, Digital Signature, Autocorrect, Spellcheck, Word Counter, Chapter Numbering, Bibliography Database, Mail Merge Wizard, Macros, and more.


It is one of the best open source document viewer as you can view different types of documents in it. Plus, you can perform several office related tasks in it as it is a powerful office suite.

Cool Reader

Cool Reader is another open source document viewer for Windows, Mac, and Linux. It is primarily an eBook reader that supports various eBook formats to import and view, such as EPUB, CHM, PDB, MOBI, FB2, TXT, RTF, DOC, TCR, HTML, etc. It facilitates you with enough tools to properly view documents in it. You can view document in distraction free mode as well as customize the entire viewing environment as per your preference. Let’s checkout its key document viewing features.

Main Features:

  • It provides a dual-page interface to read eBooks or documents.
  • You can find fullescreen mode, search tool, go to option, page navigation, and more features in it.
  • It maintains your eBook library and keep your eBooks in multiple groups and categories like Authors, Title, Series, etc.
  • You can also use Table of Content to go to a particular chapter or section of a document. Also, you can view bookmarks in a document.
  • You can customize view preferences as per you liking, like It interface settings, page layout, text formatting, etc.
  • It provides a handy night mode feature which you can use to read your document.
  • In it, you can quickly access recently viewed documents.

Additional Feature:

  • It offers a useful text to speech converter to listen to the document in a default computer voice.


It is a nice free open source document viewer to view documents and eBooks in various formats. Plus, it comes in a portable package which is another advantage of this software.

ONLYOFFICE Desktop Editors

ONLYOFFICE Desktop Editors is yet another free open source document viewer for Windows, Mac, and Linux. This software is primarily an office software with different modules including Documents, Spreadsheets, and Presentations. You can open and view various types of document in this software. Besides that, it enables you create or edit supported documents. Now, let us checkout main features of this office software.

Key Features:

  • It lets you view text documents, presentations and spreadsheets in a lot of formats such as ODT, DOC, DOCX, XML, RTF, XLS, XLSX, CSV, ODS, TXT, PPT, PPTX, ODP, PPSM, PPSX, etc.
  • You can customize various document parameters to read it, such as font, document layout, text size, foreground/ background color, etc.
  • It provides a Navigator too, which helps you find and browse through different elements of a document.

Additional Features:

As it is an office suite, you can find a lot of word processor, spreadsheet generator, and presentation designer tools. You can also find some additional tools like Translator, Thesaurus, Photo Editor, Macros, Send (via email), etc., in its Plugins tab.


It is a nice open source office suite which you can use as a document viewer as well.

Sumatra PDF

Sumatra PDF is one more free open source document viewer for Windows. As its name implies, it is primarily a PDF viewer that also supports various other document files to view. Some of the formats that it supports include eBooks and comic formats, such as EPUB, MOBI, CHM, DjVu, CBZ, CBR, etc. Let us now checkout its main features that enable you to view documents.

Key Features:

  • You can open multiple documents in it as it provides a multi-tab GUI.
  • It lets you view bookmarks of a document.
  • You can read documents in Single Page or Facing (dual page) view mode.
  • It lets you view documents in distraction-free mode by enabling Fullscreen mode.
  • You can also customize some more viewing preferences like Default Layout, Default Zoom, etc.


It is a good open source PDF and other document viewer that provides an essential set of viewing features. Also, this software offers both installer and portable download packages that can be downloaded from its official website.


Evince is yet another open source document viewer software for Windows. Using it, you can view PDF and XPS documents, DjVu files, multipage TIFF, PostScript, DVI, etc. It’s user interface is quite simple and user friendly. So, you can easily import and read any supported document with the help of some easy tools.

Main Features:

  • It shows thumbnails of all pages of a document along with the currently viewing page.
  • It offers a handy search feature to find a text in the document.
  • You can easily move from one page to another in a document.
  • It also provides standard zoom options which you can use as per your requirements.


It is a cleanly designed open source document viewer that helps you view various documents.


MuPDF is the next free open source document viewer. In it, you can view document in various formats such as PDF, XPS, EPUB, CBZ, FB2, etc. You can find all necessary tools to read document in this free software. It offers a good document viewing environment.

Main Features:

  • It provides all standard viewing tools that include zoom, rotate, page navigation, search, and more features.
  • It has a minimalistic interface that lets you focus on the actual content of a document.
  • It supports hotkeys to perform a specific operation. Check this article to know all its hotkeys.
  • You can easily toggle between colored and greyscale display mode in it.


It is a simple, portable, open source document viewer that lets you view document using standard tools.

Related Posts
Write a Comment

Komal Srivastava

Technical Content Editor

About Us

Sample image

We are the team behind some of the most popular tech blogs, like: I LoveFree Software and Windows 8 Freeware.

More About Us