screenshotePub Reader  |  Download View ePUB files right in your browser, in a popup window.

Some of the important features of the ePub Reader addon are listed below. This is followed by an overview of this addon. This summary contains few words about the addon, its function, and its features. Next is FAQ, this section is useful to get information about how this addon works in your browser. If you couldn't find a specific answer, please fill the bug report form on this page or the contact form on the homepage to let us know about your question. Following the FAQ, is the bug report form. It is designed to collect user feedbacks and bugs about this addon. Users can suggest improvements or feature requests through this form too. The next section is for submitting comments about this addon which uses the Facebook comments plugin. The last section is dedicated to reports submitted through the GitHub website. We hope the information provided on this page, could help you get all the basics you need about this addon and enable you to have a better experience with ePub Reader.

In short, ePub Reader is an addon that let you view any epub document (online/offline) inside your browser and in a separate popup window. Please check the YouTube tutorial below to get an idea of how this addon works in your browser. If you want to contribute to the developement of this addon, please fork it on GitHub, and push your changes to a named branch. Moreover, you can review all the comments made on GitHub commits.

5 Reasons to Use ePub Reader

  • Allows you to view epub document inside your browser.

  • Supports both online and offline documents.

  • Has several view options for the epub document.

  • Uses an open-source JavaScript library called epub.js for rendering epub documents.

  • Available for all browsers and platforms (windows, linux, and mac).

YouTube Tutorial

This video gives you an idea of how the extension works in your browser.

Matched Content


  • EPUB, or Electronic Publication, is an open-source file format used for digital books and publications. It was developed by the International Digital Publishing Forum (IDPF) as a standard format for e-books, allowing for reflowable content that can adapt to various screen sizes and devices. EPUB files are typically composed of three main components: HTML (Hypertext Markup Language) content, a styling language called CSS (Cascading Style Sheets), and a standardized package format called OPF (Open Package Format). The HTML content provides the structure and text of the publication, while the CSS is used to control the presentation and formatting of the content. The OPF package organizes and links the HTML and CSS files together, as well as any additional media files, metadata, and navigation elements.

    One of the key features of EPUB is its use of XML (Extensible Markup Language) to encode the content, which allows for easy manipulation and customization of the publication. This allows for a high level of accessibility, as the content can be easily translated and adapted for different languages, fonts, and devices. EPUB supports a range of multimedia elements, including images, audio, and video. These can be integrated into the publication in many ways, such as pop-up windows, audio captions, and inline video playback. EPUB files can be read on a variety of devices, including e-readers, tablets, and smartphones. Many e-book platforms, such as iBooks and Google Play Books, support EPUB as a standard format for their digital publications. In addition to its use in e-books, EPUB has also been adopted as a standard format for digital magazines, newspapers, and other publications. It allows for a consistent reading experience across different devices, as well as the ability to easily update and distribute content. While EPUB has become a widely-used and accepted format for digital publications, it does have some limitations. One of the main limitations of EPUB is its use of reflowable content, which can lead to formatting issues on certain devices. This means that the text and images in an EPUB publication will automatically adjust to fit the screen size and resolution of the device, which can potentially cause problems with the layout and appearance of the publication. Another limitation of EPUB is its lack of support for complex layouts and interactive elements. EPUB files are primarily composed of HTML and CSS, which are not well-suited for creating advanced layouts or interactive elements such as animations and multimedia presentations. This can be a limitation for certain types of publications, such as children's books or educational materials, that may require more sophisticated design elements. Additionally, EPUB files can be large in size, that can be an issue for devices with limited storage space or slow internet connections. It makes it difficult to distribute and download large EPUB publications, particularly on mobile devices.

    Despite these limitations, EPUB remains a popular and widely-used format for digital publications. Its support for multimedia elements, accessibility, and compatibility with a wide range of devices makes it a versatile choice for authors and publishers. It is a versatile and flexible file format that has become the standard for digital books and publications. Its open-source nature and support for multimedia elements make it a popular choice for authors, publishers, and readers alike. The EPUB Reader addon allows you to easily open and view EPUB documents in your web browser. For more information about this addon, please see the FAQ section below.

Frequently Asked Questions

  • 1. What is ePub Reader?

    ePub Reader, is a simple and powerful add-on that can open any document with an epub file extension. Please right-click on any epub link and then click on the - View ePub - item from the context menu. Alternatively, you can open the popup window and then add the epub link in the UI to view the document. For offline files, simply drag the file to the designated area in the popup in order to load the epub document. There are several views to render epub documents. Moreover, you can resize the window to your desired size and the document will adapt itself to the new size. Please read the following to get more info about ePub Reader add-on.

  • 2. How can I work with this addon?

    In order to work with this addon, simply right-click on any epub link, then click on the - View ePub - item in context menu. Please note that you can only select a ".epub" file extension. If you have an epub file in your machine and want to view the file, simply drag and drop the file in the UI (top section). The addon will load the file from your machine and renders it the UI. In top toolbar, there are 8 custom views for the epub document. The default view is - Continues Scroll. Please select different views in order to find the one that matches your need. If you want to hide the top toolbar, please press on the - UP - button on top left corner in the UI. Likewise, if the toolbar is hidden and you want to show the toolbar, please press on the - DOWN - arrow button.

  • 3. How can I download the source code for ePub Reader?

    To download the source code for this extension from Chrome Web Store, it is recommended to use Extension Source Downloader. With this addon, you can download the source code as a ZIP or CRX format to your machine. If you want to download the source code from the Firefox addons store, please open the firefox download link (if available) in the Firefox browser and then right-click on the - Add to Firefox - button and select - Save Link As... - item. Choose the destination folder on your machine and then save the file in XPI format. You can then rename the XPI format to a RAR or ZIP file. Some extensions may have a GitHub repo address, which you can use to download the source code as well. But, it may not be the latest version of the addon. Therefore, downloading the source code from the official web stores is the best option as it always gives you the latest version of the addon.

  • 4. What is ePub?

    ePub is a new e-book file format for viewing online or offline documents. It stands for electronic publication and supported by many e-book readers. Currently, modern browsers do not support ePub by default. Therefore, this addon can be very useful if you dont want to install third-party software to view ePub documents. Please read this Wikipedia page to get more info about ePub file format.

  • 5. What API/engine is behind the rendering process?

    This addon uses an open-source library called epub.js. It works in all modern browsers on desktop and mobile machines. If you want to get more info about this addon, please read this page in GitHub.

  • 6. Are there any options or settings to adjust in this addon?

    There is not a separate options or settings page for this addon. All the settings required to operate with this addon is available in the toolbar within the app UI (top section).

  • 7. How can I change the ePub view?

    As mentioned above, there are 8 options to view the ePub document. For example, you can view the document by mouse scrolling, or like a book, with left|right page action buttons. Please note that all changes are auto-saved to the memory.

  • 8. Can I convert ePub to PDF with this addon?

    No, unfortunately, this addon is only for viewing ePub documents. If you want to convert ePub to PDF, please install a separate addon.

  • 9. Is this addon available for mobile browsers?

    Yes, this addon is available for both mobile and desktop machines in all operating systems (windows, linux and mac).

  • 10. How can I disable this addon?

    In order to disable this addon, please head to the extensions tab and then click on the disable button next to addons name.

  • 11. Where can I find the privacy policy for ePub Reader?

    Please read the privacy policy for this extension here.


Reporting Bugs

Your feedback goes a long way towards making this addon even better. With this feedback and bug report form, you can report bugs or suggest features/enhancements for the functionality or performance of this addon. Please note that this form will be sent to the developer(s) of this addon. You will not get an immediate or personal response at the moment. However, the developer(s) may contact you through the email address provided in this form for further clarifications or to request additional information regarding the reported bug(s).

If you want to rate or write a review for this addon in the official webstore, please press the - Rate this addon - button below.

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Please be as specific as possible. Basically, describe what happened, what you were doing when it happened, and why you think it is a problem.

Describe the step-by-step process required to reproduce the issue you are reporting. Be specific when describing these steps by providing as much detail as possible.

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Reviews | Discussions

Please note: keep these reviews/discussions clean, and avoid the usage of derogatory or inappropriate language or terminology in references to individuals or groups based on race, national or ethnic origin, color, religion, age, gender, etc. Do not submit bugs in your reviews, use the above bug-report section instead. Also, never post any personal information in these reviews.

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