Readbook - Text, Image Reader

It is a large-capacity text file viewer + scanned image, pdf 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 - Save and Load Theme Settings 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.