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Okular VS PdfToolStack

Compare Okular VS PdfToolStack and see what are their differences

Okular logo Okular

Okular is a universal document viewer based developed by KDE.

PdfToolStack logo PdfToolStack

AI-powered PDF tools for small teams โ€” compress, sign, extract, and review with AI
  • Okular Landing page
    Landing page //
    2023-05-02
  • PdfToolStack Landing page
    Landing page //
    2026-08-20

Okular features and specs

  • Open Source
    Okular is an open-source software, which means the source code is freely available. Users can modify and distribute it according to their needs.
  • Multi-Format Support
    Okular supports a wide array of document formats including PDF, PostScript, DjVu, CHM, XPS, ePub, and more, providing versatile document reading capabilities.
  • Cross-Platform
    Okular is available for multiple operating systems including Linux, Windows, and macOS, making it accessible to a wider range of users.
  • Annotation Tools
    It includes powerful annotation features allowing users to add notes, highlight text, and draw shapes directly on documents.
  • Customizable Interface
    The interface is highly customizable, enabling users to tweak the appearance and functionality to match their preferences.
  • Tabbed Browsing
    Okular supports tabbed browsing, allowing users to open multiple documents in a single window, enhancing multitasking.

Possible disadvantages of Okular

  • Limited Advanced PDF Editing
    While Okular provides basic annotation features, it lacks advanced PDF editing capabilities like modifying text and images within a PDF.
  • Learning Curve
    New users might find the extensive range of features and settings overwhelming, leading to a steeper learning curve compared to simpler document viewers.
  • Performance Issues
    Some users have reported performance issues when handling very large files, which can result in slower operation and responsiveness.
  • Dependency on KDE Libraries
    To get the best experience, Okular requires KDE libraries, which might not be ideal for users who prefer not to integrate KDE components into their system.
  • Mobile Support
    Okular does not have a dedicated app for mobile platforms like Android and iOS, limiting its usability on tablets and smartphones.

PdfToolStack features and specs

  • All-in-One PDF Solution
    PdfToolStack offers a comprehensive suite of PDF tools including merging, splitting, compressing, converting, and editing PDFs, eliminating the need for multiple separate applications.
  • Web-Based Convenience
    Being an online tool, it requires no software installation, allowing users to access PDF utilities from any device with an internet connection.
  • User-Friendly Interface
    The platform is designed with simplicity in mind, making it accessible for users with varying levels of technical expertise to perform PDF operations quickly.
  • Free Access to Basic Features
    Many core functionalities are available at no cost, making it an attractive option for users with occasional or basic PDF processing needs.
  • Cross-Platform Compatibility
    Since it operates through a web browser, PdfToolStack works across different operating systems including Windows, Mac, and Linux without compatibility issues.

Possible disadvantages of PdfToolStack

  • Internet Dependency
    As a web-based tool, it requires a stable internet connection to function, making it unusable in offline scenarios or areas with poor connectivity.
  • Privacy and Security Concerns
    Uploading sensitive or confidential documents to an online platform raises potential privacy risks, as files are processed on external servers.
  • File Size Limitations
    Free versions of online PDF tools often impose restrictions on file size or the number of operations, which can be limiting for users with large documents.
  • Potential Advertisements
    Free web-based tools frequently include ads or upsell prompts for premium features, which can disrupt the user experience.
  • Limited Advanced Features
    Compared to dedicated desktop PDF software, PdfToolStack may lack more sophisticated editing capabilities needed by professional or power users.

Analysis of Okular

Overall verdict

  • Yes, Okular is generally regarded as a good document viewer due to its features, flexibility, and open-source nature, which ensures continual updates and community support.

Why this product is good

  • Okular is considered good for several reasons: it is a versatile open-source document viewer developed by the KDE community, supporting various file formats including PDF, PostScript, and ePub. It offers a range of features such as annotation tools, form filling, text extraction, and multimedia support. Additionally, it is cross-platform, available on different operating systems like Linux, Windows, and macOS, making it accessible for a wider range of users.

Recommended for

    Okular is recommended for students, educators, professionals, and any users who require a reliable and feature-rich document viewer capable of handling a wide range of file formats. It is particularly beneficial for those who value open-source software and need robust annotation and document management tools across different platforms.

Okular videos

okular, program for annotating your books in linux

More videos:

  • Review - Review: Okular || Awesome PDF Viewer || Best PDF Viewer that I have tried yet.
  • Review - Okular Document Viewer vs Atril Document Viewer

PdfToolStack videos

No PdfToolStack videos yet. You could help us improve this page by suggesting one.

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Category Popularity

0-100% (relative to Okular and PdfToolStack)
PDF Tools
95 95%
5% 5
PDF Compressor
0 0%
100% 100
PDF Editor
93 93%
7% 7
PDF Readers And Editors
100 100%
0% 0

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare Okular and PdfToolStack

Okular Reviews

10 Best PDF Expert Alternatives for Various Tasks in 2022
Verdict: Okular is an open source and can be used free, which is probably its main advantage. At the same time, its basic functionality is meant to be not only highly competitive with PDF Expert but rather overcomes it because the letter can be used only under paid subscription. This PDF Expert alternative is one of the most all-in-one PDF readers, which is compatible not...
Source: fixthephoto.com
8 Best eBook Readers for Linux
Okular is another open-source and cross-platform document viewer developed by KDE and is shipped as part of the KDE Application release.
Source: itsfoss.com

PdfToolStack Reviews

We have no reviews of PdfToolStack yet.
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Social recommendations and mentions

Based on our record, Okular seems to be more popular. It has been mentiond 44 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Okular mentions (44)

  • Signing PDFs
    If you mean signing as in "signing with your handwritten signature", you could use Okular () which easily allows you to do that. Filling out forms also works nicely. Source: over 2 years ago
  • Alexandria: A minimalistic cross-platform eBook reader
    I was in a similar position lately until I found Okular. Have you tried it? https://okular.kde.org/. - Source: Hacker News / almost 3 years ago
  • Help with PDF's
    I would try Okular first, though, which is free and open source: https://okular.kde.org/. Source: about 3 years ago
  • EPUB 3.3 becomes a W3C recommendation
    KDE's okular might be a good choice. I haven't personally used it for epub but I know it supports it. https://okular.kde.org/. - Source: Hacker News / about 3 years ago
  • Are there any good PDF viewers for large (10Mb+) datasheets that can save search results in the actual PDF, and take notes on the PDF?
    I use okular, don't think it has web export though. Source: over 3 years ago
View more

PdfToolStack mentions (0)

We have not tracked any mentions of PdfToolStack yet. Tracking of PdfToolStack recommendations started around Jun 2026.

What are some alternatives?

When comparing Okular and PdfToolStack, you can also consider the following products

Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.

iLovePDF - Premium online PDF tool set

Evince - Evince is a document viewer for multiple document formats: PDF, Postscript, djvu, tiff, dvi, XPS...

Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.

calibre - Ebook manager, viewer & converter

Smallpdf - PDF document management and conversion suite