EPUB Viewer - Read EPUB eBooks on Android & Online

Books distributed as EPUB follow an open standard that the W3C now maintains. The format packages XHTML content that reflows to fit any screen, which made it the common choice for digital books outside Amazon’s ecosystem. Reading apps, libraries and publishing tools on Android encounter it constantly.

GroupDocs.Viewer Cloud renders EPUB content as HTML, PDF, JPG or PNG over REST, so an Android app can present a book without embedding a full EPUB engine. Selected pages load long books gradually, and thumbnails can be used for a chapter picker.

The Java SDK carries the integration for Android, complete with samples for Maven and Gradle projects. Because the API covers 180+ formats, the same viewer code also handles PDF and other document types in a mixed catalog.

A reader who wants one book on screen right now can use the online GroupDocs.Viewer app at no charge. Developers start with the API Explorer, which shows each call, and then a free trial.


  • View EPUB Online via Python
  • View EPUB Online via Ruby
  • View EPUB Online via Go
  • View EPUB Online via .NET
  • View EPUB Online via cURL
  • View EPUB Online via Java
  • View EPUB Online via Node.js
  • View EPUB Online via PHP

EPUB Viewer - Read EPUB eBooks on Android & Online

View EPUB and other Popular Formats for Free

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How to view EPUB file online

  • Select the file by clicking the EPUB App or simply drag & drop a EPUB file.
  • Click the Open button to upload and view EPUB file.
  • That is all! You can view your EPUB document online.

Frequently Asked Questions

Are there SDKs available for GroupDocs.Viewer Cloud APIs?

Yes, GroupDocs provides SDKs for various programming languages to simplify the integration and utilization of Viewer Cloud APIs in your applications.

What file formats are supported by GroupDocs.Viewer Cloud APIs?

GroupDocs.Viewer Cloud APIs support a wide range of file formats including PDF, Word, Excel, and more.

How secure is the document viewing process in GroupDocs.Viewer Cloud?

GroupDocs.Viewer Cloud ensures a secure document viewing process with data encryption, secure protocols, and adherence to data protection standards.

Is there a limit on the number of document views I can generate using GroupDocs.Viewer Cloud APIs?

GroupDocs.Viewer Cloud APIs offer flexible limits on the number of document views based on your subscription plan. Contact GroupDocs support for more details on view limits.

I want to create my own app that can view EPUB file online?

Check our Cloud SDKs at GitHub if you are looking for the source code to view EPUB file format in the Cloud.

What features does GroupDocs.Viewer Cloud offer?

GroupDocs.Viewer Cloud provides various features, such as zooming, paging, searching within documents, text selection, and rendering options. You can render specific pages, generate document thumbnails, or even render documents as images.

How do I bring EPUB pages into an Android reader?

The Android SDK for Java arrives through Gradle. Once the book file sits in storage, ViewDocument returns chapter pages as HTML, as PDF, or as images that a reading activity displays.

How can I integrate GroupDocs.Viewer Cloud into my application?

Integration is done through APIs provided by GroupDocs.Viewer Cloud. The service offers APIs for different programming languages and platforms, making it convenient for developers to incorporate document viewing capabilities into their applications or websites.

What document formats does GroupDocs.Viewer Cloud support?

GroupDocs.Viewer Cloud supports a wide range of document formats, including PDF, Microsoft Word (DOC, DOCX), Excel (XLS, XLSX), PowerPoint (PPT, PPTX), images (JPEG, PNG, GIF, TIFF), and more.

Are there any limitations or usage restrictions with GroupDocs.Viewer Cloud?

GroupDocs.Viewer Cloud has certain usage limits depending on the subscription plan you choose. These limits may include the number of API requests, document size, or the number of concurrent connections. Its recommended to review the pricing and plans to understand the specific limitations.

Can I render only part of a long EPUB book?

Yes. Selected pages are rendered on request, so a reading app loads chapters gradually instead of processing an entire book at once. Thumbnails remain available for navigation.

Open eBook File (EPUB) Viewer REST API

Get EPUB document information like page & attachment count as well as properties

Render EPUB files using a single API call

EPUB REST APIs are secured and require authentication

View EPUB with its attachments

Rotate, reorder & watermark EPUB pages

View EPUB and hundreds of other formats from CAD, Word, PowerPoint, Excel, Email & eBook

View EPUB as PDF

View EPUB as Images like BMP, PNG, JPEG & TIFF

View EPUB as HTML5

Free online EPUB viewer supports over 186 file formats

The cloud-based viewer API for EPUB has the ability to display different document formats quickly, with just a few lines of code. Using the SDK for Android you can find out about the various document formats supported by the SDK.

Programmatically get list of supported file types.

Use our REST API to get list of 186 supported document types.

Integration capabilities

Developers can easily integrate the Viewer Cloud APIs into their applications to enable users to view documents directly within the application interface without the need to download them.

Printing support

Users can print documents directly from the viewer, enabling them to easily generate physical copies of the document content if needed.

GroupDocs.Viewer Cloud REST API Explorer

The easiest way to try out GroupDocs.Conversion Cloud API right away in your browser is by using GroupDocs Cloud Web API explorer, which is a collection of Swagger documentation for the GroupDocs Cloud APIs.It allows you to effortlessly interact and try out every single operation our APIs exposes.

Online document viewing

Users can view documents online without the hassle of downloading them first, providing a convenient and efficient way to access and interact with document content.

Minify EPUB Output Content

One of the most exciting features of our Cloud-based viewer API for EPUB is its ability to minify the output content. Minification removes comments, extra white-spaces, and other unneeded characters without breaking the content structure. As a result, the page becomes smaller in size and loads faster.

Zooming functionality

The Viewer Cloud APIs provide zooming capabilities, allowing users to zoom in and out of document pages to view content in more detail or from a broader perspective.

Free Apps support show or hide document comments

API Allows to view and comments embedded inside supported documents types.

Text selection

Users can select, copy, and paste text directly from documents, making it easy to extract and use information from the content.

Wide range of document format support

GroupDocs.Viewer Cloud APIs and FREE Apps support a variety of document formats including PDF, Microsoft Office (Word, Excel, PowerPoint), AutoCAD, image files (PNG, JPEG), and more.

Self-host EPUB Cloud Viewer Free App

The GroupDocs.Viewer Cloud Container Image enables users to self-host GroupDocs.Viewer Cloud for EPUB using Docker.

Extract document text while rendering in image mode

Our API allows extract text from documents

Page navigation

The APIs offer intuitive page navigation features that allow users to navigate through document pages easily and efficiently.

Flexible Rendering of EPUB Documents

GroupDocs.Viewer is a powerful document viewer REST API that allows you to display over 186 document formats in your applications. It allows rendering of EPUB for the whole document, page by page or custom range of pages.

Free Apps availability

Users can access and utilize FREE Apps for document viewing and annotation online, providing a convenient and cost-effective solution for accessing and interacting with document content.

Free Alternative to Desktop & Mobile EPUB Viewer Apps

GroupDocs.Viewer Cloud app does not need any installation or setup to view EPUB. You can quickly start using the Viewer App in your browser to view any number of files per day absolutely free of charge.

Render EPUB files to remote FTP or Cloud storage

Use third-party cloud storage to save your EPUB rendered files.

  • Amazon S3
  • Azure Storage
  • Google Cloud Storage
  • Google Drive
  • Dropbox
  • Box
  • FTP

Show or hide document headers and footers

GroupDocs.Viewer Cloud APIs supports rendering of headers and footers.

Support and Learning Resources

Learning Resources

Product Support

Start Free Trial
Download GitHub Repository

View EPUB using SDKs in other popular languages

View EPUB Online via Python GroupDocs.Viewer
Cloud SDK for Python

View EPUB Online via Ruby GroupDocs.Viewer
Cloud SDK for Ruby

View EPUB Online via Go GroupDocs.Viewer
Cloud SDK for Go

View EPUB Online via .NET GroupDocs.Viewer
Cloud SDK for .NET

View EPUB Online via cURL GroupDocs.Viewer
Cloud for cURL

View EPUB Online via Java GroupDocs.Viewer
Cloud SDK for Java

View EPUB Online via Node.js GroupDocs.Viewer
Cloud SDK for Node.js

View EPUB Online via PHP GroupDocs.Viewer
Cloud SDK for PHP

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