KOReader Custom Screensaver: Single Image or Random Folder

In KOReader

1. 1

   Export at panel pixels

   Choose the Kindle, Kobo, or BOOX preset that matches your device so KOReader does not need to stretch or letterbox the file.

2. 2

   Copy the file onto the reader

   Connect by USB and place the PNG or JPEG in a folder you can browse from KOReader, such as a screensavers folder on the device drive.

3. 3

   Open Screensaver settings

   In KOReader’s top menu, open Settings (gear icon) → Screen → Screensaver, then open Wallpaper.

4. 4

   Choose the source, then select its file or folder

   In Wallpaper, select “Show custom image or cover on sleep screen”, then open Custom images → Choose image or document cover to pick your file. For a folder, select “Show random image from folder on sleep screen”, then open Custom images → Choose random image folder. Enable “Cycle through images in order” if you prefer sequential rotation.

5. 5

   Adjust border fill and test sleep mode

   Under Border fill, rotation, and fit, choose how KOReader handles leftover edges and rotation. “No fill” only leaves margins unshaded in KOReader; exported PNGs remain opaque. Put the reader to sleep while KOReader is open to check the result.