Readbook - Text/Image Viewer

It is a large-capacity text file viewer + scanned image viewer. It also provides convenient explorer function and TTS function.

1. Convenient Explorer
- The list UI provides various filter functions, sorting functions, and also provides a filter function for words entered by the user.
- Folder/file name change and deletion functions are possible.
- Google/Naver review search of the file name of the selected item is possible with one click.
- Google Drive can be used.
- SD card can be used.
- File search function
- Preview thumbnail

2. User-friendly theme
- 12 preset themes are provided.
- Custom text color, background color, and font can be changed.
- Font size, line spacing, left and right margins, top margin, bottom margin can be changed.
- Spaces and line breaks are compensated to improve readability. - Incomplete text display is not possible

3. Viewer
- Supports horizontal and vertical modes
- Page navigation
- Search text in documents

4. Control functions
- Move pages with volume keys
- Use screen scroll function
- Move pages with touch
- Prevent automatic screen off

5. TTS
- Change engine, change voice, change speed, change volume
- Provide notification UI
- Support timer function, skip hanja option

6. Scan Image Viewer
- Automatically selects split mode, 2-page mode.
- Provides dark, light, and clear filters.
- Provides dark theme.

7. Others
- Remember the last viewed file and location
- Recent file list function
- Bookmark function

For errors and inconveniences, please request through [Side menu > Send inquiry email] in the app.

[Permission description]
- File reading permission: Used to read files in all paths of the device.
- Access to all files: From OS 11, 'File reading permission' has been replaced with 'Access to all files' by Google policy.