Features on the Android device
- Open files with .epub extension.
- Customized TOC provided additionally.
- Reopen to the location of last reading page.
- Import .epub eBooks by selecting "Open with" context menu which pops up when you tap .epub file in file browser.
- Import .epub eBooks from the email app's file attachments.
- Choose Options that have one page(landscape) two pages(landscape) or scroll type(portrait) with fixed-layout book and Options that have one page(portrait) or scroll type(portrait) with reflowable-layout book.
- Audio playback and video full screen switch.
- Media Overlay SMIL support to fixed layout ePUB With Read Aloud Feature For Fixed-Layout ePUB.
- Double-tap the image to zoom-in image on the popup.
- Track the path of moving pages.
- To turn pages and toggle menus, use two touches(multi-touch) on both sides and center of the screen, respectively.
- Adjust font size.
- Jump to the reading pages by history buttons.
- Add notes, highlighters or bookmarks of reading pages.
- EPUB reflowable-layout viewer.
- EPUB fixed-layout viewer.
- Select Scrolling type viewer or paging type viewer.
- Browse .epub .zip epub files on your device.
- Find text across all pages of the book.

Features on the iOS device
- Open files with .epub extension.
- Customized TOC provided additionally.
- Import .epub eBooks by selecting "Share with" context menu which pops up when you tap .epub file in file browser iOS built-in app.
- Reopen to the location of last reading page.
- The writing direction of scripts like Korean, English, Japanese, Arabic, etc is used as natural writing direction.
(Reading from-left-to-right, reading from-right-to-left, reading from top to bottom and from right to left; ltr, rtl, vertical-rl)
- EPUB reflowable-layout viewer.
- EPUB fixed-layout viewer.
- HTML5 audio and video playback.
- Media overlay supports synchronizing audio media.
(Option of choosing text element style can be set if media overlay does not have an author-defined style synchronizing audio-text visual highlighting.)
- Adjust text size, line height and margins of content on viewer view.
- Bookmarks, table of contents, memo note.

Features on the Windows device
- Open files with .epub extension.
- Customized TOC provided additionally.
- Reopen to the location of last reading page.
- Import .epub eBooks by selecting "Open with Gglreader" context menu which pops up when you mouse-right-click .epub file in file browser.
- Adjust CSS to change font size, margins, line height
- EPUB reflowable-layout viewer.
- EPUB fixed-layout viewer with one page or two pages.
- Media Overlay SMIL support to fixed layout ePUB With Read Aloud Feature For Fixed-Layout ePUB.
- Browse .epub .zip epub files on your device.

- How to install & run Gglreader Windows x64
1) Download recent Gglreader.exe
2) Install Gglreader.exe to the folder you want to install. Or install to Portable USB
3) And then click start.cmd file in Gglreader folder where you installed the Gglreader.
4) To run Gglreader, click Gglreader Shortcut on installed folder or Gglreader shortcut on your desktop.

- How to update Gglreader Windows x64 and how to maintain all existing imported ebooks in updated Gglreader
1) Download recent Gglreader.exe
2) Install recent Gglreader.exe in the folder where you installed the previous version.

- How to unintall Gglreader Windows x64
1) Click unintall.cmd file in Gglreader folder where you installed the Gglreader.
This unistall work will uninstall Gglreader on your desktop and delete Gglreader folder and all files in Gglreader folder where Gglreader installed.