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Open Source Okular Alternatives

The best open source alternative to Okular is SumatraPDF. If that doesn't suit you, our users have ranked more than 50 alternatives to Okular and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Okular are calibre, Evince, MuPDF and Firefox PDF Viewer (PDF.js).

Okular alternatives are mainly PDF Readers but may also be Ebook Readers or PDF Editors. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Okular.
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Okular iconOkular
  315
  • FreeOpen Source
  • Windows
  • Linux
  • BSD

Multi-platform, fast and packed with features, Okular allows you to read PDF documents, comics and EPub books, browse...

Learn more about Okular

  1. Sumatra PDF is a free PDF, eBook (ePub, Mobi), XPS, DjVu, CHM, Comic Book (CBZ and CBR) viewer for Windows.

    ⚫︎ LightweightSumatraPDF consumes less device resources compared to similar apps.
    ⚫︎ Ad-freeSumatraPDF doesn't contain any form of external advertising.
    ⚫︎ PortableSumatraPDF can be used from a USB stick or similar with no prior installation.
    ⚫︎ PDF annotationSumatraPDF support PDF Annotation for highlighting, notes etc
    ⚫︎ Dark ModeSumatraPDF supports dark mode for comfortable usage in low light conditions.
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    SumatraPDF vs Okular opinions
    This alternative is disputed. SumatraPDF is still a legitimate alternative to Okular, but it might have issues that some users think are important.

    Sumatra doesn't have comments and fill forms functionality as Okular does.

    Negative comment ago
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    14
    idlesHand

    Tabs! and is also open source

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    0
  2. Calibre is a free and open source e-book library management application made by users, for users. Many languages, designed around the concept of the logical book, i.e., a single entry in your library that may correspond to actual e-book files in several formats.

    ⚫︎ Built-in viewercalibre shows you a quick preview of an image, page or file in supported formats.
    ⚫︎ Customizablecalibre is easy to customize with themes or similar features.
    ⚫︎ Portablecalibre can be used from a USB stick or similar with no prior installation.
    ⚫︎ DRM FreeNo Digital rights management (DRM), i.e. no copy protection.
    ⚫︎ Extensible by Plugins/Extensionscalibre can be extended with add-ons, plugins and extensions.
    ⚫︎ Handwritten Notescalibre supports writing by hand (or a stylus) and your text will be converted to text.
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    Screenshot
    calibre vs Okular opinions
    This alternative is disputed. calibre is still a legitimate alternative to Okular, but it might have issues that some users think are important.
    rmsfis

    Calibre is a library management system, while Okular is a feature-rich PDF reader

    Negative comment ago
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    1


  3. Evince icon

    Evince

    • FreeOpen Source
    • Linux
    • PortableApps.com

    Evince (or GNOME Document Viewer) is a document viewer for multiple document formats: PDF, Postscript, djvu, tiff, dvi, XPS, SyncTex support with gedit, comics books (cbr,cbz,cb7 and cbt) and others. See Supported Document Formats for details.

    ⚫︎ LightweightEvince consumes less device resources compared to similar apps.
    ⚫︎ PDF annotationEvince support PDF Annotation for highlighting, notes etc
    ⚫︎ PortableEvince can be used from a USB stick or similar with no prior installation.
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    Screenshot
    Evince vs Okular opinions
    Most users think Evince is a great alternative to Okular.

    There is windows compatible version this program.

    Positive comment ago
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    -1
  4. MuPDF icon

    MuPDF

    • FreeOpen Source
    • Windows
    • Linux
    • Android
    • iPhone
    • iPad
    • F-Droid
    • Xfce

    MuPDF is a highly versatile, customizable PDF and XPS interpreter solution that can be used across a wide range of applications as a PDF renderer, viewer, or toolkit.

    ⚫︎ LightweightMuPDF consumes less device resources compared to similar apps.
    ⚫︎ PortableMuPDF can be used from a USB stick or similar with no prior installation.
    ⚫︎ PDF annotationMuPDF support PDF Annotation for highlighting, notes etc
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    Screenshot
  5. PDF Viewer (aka pdf.js) is a new revolutionary extension using web standard technologies that allows you to display within Mozilla Firefox almost all PDF files found on the web without a plugin.

    ⚫︎ LightweightFirefox PDF Viewer (PDF.js) consumes less device resources compared to similar apps.
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    Screenshot
    Firefox PDF Viewer (PDF.js) vs Okular opinions
    pros, cons and recent comments

    It works well and it works in Firefox

    Positive comment ago
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  6. Document Viewer icon

    Document Viewer

    • FreeOpen Source
    • Android
    • Android Tablet
    • F-Droid

    Document Viewer is a highly customizable document viewer for Android, fork of the last GPL version of EBookDroid .

    ⚫︎ CustomizableDocument Viewer is easy to customize with themes or similar features.
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    library view
  7. A simple and modern eBook viewer.

    ⚫︎ Dark ModeFoliate supports dark mode for comfortable usage in low light conditions.
    ⚫︎ Ad-freeFoliate doesn't contain any form of external advertising.
    ⚫︎ Text to SpeechFoliate allows you to transform written text into spoken text.
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    Screenshot
  8. zathura icon

    zathura

    • FreeOpen Source
    • Mac
    • Linux
    • BSD
    • MacPorts
    • Homebrew

    zathura is a highly customizable and functional document viewer based on the poppler rendering library and the gtk+ toolkit.

    ⚫︎ Lightweightzathura consumes less device resources compared to similar apps.
    ⚫︎ Extensible by Plugins/Extensionszathura can be extended with add-ons, plugins and extensions.
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    Bestfit
  9. Skim icon

    Skim

    • FreeOpen Source
    • Mac

    Skim is a PDF reader and note-taker for OS X. It is designed to help you read and annotate scientific papers in PDF, but is also great for viewing any PDF file.

    ⚫︎ LightweightSkim consumes less device resources compared to similar apps.
    ⚫︎ PDF annotationSkim support PDF Annotation for highlighting, notes etc
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    The PDF Window
    Skim vs Okular opinions
    This alternative is disputed. Skim is still a legitimate alternative to Okular, but it might have issues that some users think are important.
  10. KOReader icon

    KOReader

    • FreeOpen Source
    • Linux
    • Android
    • Kobo
    • PocketBook Reader
    • Kindle Fire

    KOReader is a document viewer for E Ink devices. Supported fileformats include EPUB, PDF, DjVu, XPS, CBT, CBZ, FB2, PDB, TXT, HTML, RTF, CHM, DOC, MOBI and ZIP files. It’s available for Kindle, Kobo, PocketBook, Android and desktop Linux.

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Showing 10 of 37 alternatives