Note: you will need to setup SSH to follow the instructions below.

The splash screens the reMarkable uses are stored as PNG files in /usr/share/remarkable

root@remarkable:~# ls -la /usr/share/remarkable
drwxr-xr-x    4 root     root          1024 Jan  3 13:24 .
drwxr-xr-x   23 root     root          1024 Jan  3 13:24 ..
-rw-r--r--    1 root     root         65309 Nov  9 15:59 batteryempty.png
-rw-r--r--    1 root     root         75499 Nov  9 15:59 poweroff.png
-rw-r--r--    1 root     root         63863 Nov  9 15:59 rebooting.png
-rw-r--r--    1 root     root         63638 Nov  9 15:59 restart-crashed.png
-rw-r--r--    1 root     root         52644 Nov  9 15:59 sleeping.png
-rw-r--r--    1 root     root       2629366 Jan  3 14:22 splash.bmp
-rw-r--r--    1 root     root         59839 Nov  9 15:59 starting.png
-rw-r--r--    1 root     root         63586 Nov  9 15:59 suspended.png
drwxr-xr-x    2 root     root          2048 Jan  3 13:23 templates
-rw-r--r--    1 root     root           197 Jan  3 13:22 update.conf
drwxr-xr-x    3 root     root          1024 Nov  9 15:55 webui

These files can be copied off the reMarkable with scp over ssh and then edited in a normal image editor that understands PNGs and copied back. Note that transparency, if present, is taken into account by the tablet (meaning that the former content remains visible where the PNG is transparent; this is used e.g. by sleeping.png in the 'light sleep' mode).

The filenames are reasonably self-explanatory, but it is worth noting that a second copy of splash.bmp is stored in /var/lib/uboot/ (where a FAT partition for booting is mounted): you have to copy it over there if you want it to be shown when you power up the reMarkable. It also expects a specific version of bitmap format, specifically version 4, so you need the file utility to yield PC bitmap, Windows 95/NT4 and newer format on whatever you replace it with. One way to achieve this is to edit your image using GIMP and enable greyscale mode before exporting to .bmp, which will then set it to version 4 automatically, instead of version 5 if you had maintained colour, which cannot be displayed by the bootloader. This image should also be rotated 90 degrees clockwise.

Also worth noting is that the reMarkable displays a progress sequence of dots in the middle while showing starting.png, so it might be worth adding your contact details (or other changes) where they won't be obscured by this graphic.

• remarkable-hyutilities
• remarkable-assistant
• Einkpads Splash | Screen Customizer (paid)
• reMarkable Connection Utility (RCU) (paid)

• Snoopy asleep To replace suspended.png
• remarkable_news Daily news/comics on your reMarkable's suspend screen
• reMarkable-random-screens Automatically change your poweroff and suspend screens every 5 minutes