# Creating custom icons for OpenCore and Mac Boot Picker

For users who want to customize your setup to be more personal, OpenCore does allow for custom icons and images in the boot picker.

# Custom OpenCore icons

To generate custom OpenCore icons, you'll need the following:

  • Images in PNG format
  • Each image, with the following res:
    • Cursor — Mouse cursor (mandatory, up to 144x144).
    • Selected — Selected item (mandatory, 144x144).
    • Selector — Selecting item (mandatory, up to 144x40).
    • Left — Scrolling left (mandatory, 40x40).
    • Right — Scrolling right (mandatory, 40x40).
    • HardDrive — Generic OS (mandatory, 128x128).
    • Background — Centred background image. (Recommended max size 1920x1080)
    • Apple — Apple OS (128x128).
    • AppleRecv — Apple Recovery OS (128x128).
    • AppleTM — Apple Time Machine (128x128).
    • Windows — Windows (128x128).
    • Other — Custom entry (see Entries (opens new window), 128x128).
    • ResetNVRAM — Reset NVRAM system action or tool (128x128).
    • Shell — Entry with UEFI Shell name for e.g. OpenShell (128x128).
    • Tool — Any other tool (128x128).

Note, for each image we recommend having one of double the size. This ensures that icons are scaled correctly since .icns support dedicated images depending on HiDPI or not.

Once you have a custom image you want to use(for example, as a background), download the latest release of OpenCorePkg (opens new window) and enter the Utilities/icnspack/ folder:

Now cd this folder in terminal and run the following:

./icnspack Background.icns <insert_x1_image> <insert_x2_image>

Once done, you'll see your custom icon generated in icnspack's folder:

# Custom Mac Boot Picker icons

Custom boot picker icons is much more complicated on Legacy Macs, on late 2013+ Macs the Custom OpenCore icons method will work just fine. However on many 2012 and older Macs, the icons generated will be incompatible with the firmware.

To generate legacy icons, you'll need the following:

Head to developer.apple's More Downloads page (opens new window) and search for Graphics Tools that is supported by your OS(note for 10.6 and older, the app is hidden inside Developer Tools):

Once downloaded, open the disk image and you'll find Icon Composer.app:

Graphics Open

Now run the app and simply drag the images to each section as so:

Now save and export the new icns

# Installing updated icons

To install, please ensure that Vault is disabled when you built OpenCore. If you're unsure, simply rebuild OpenCore with the Patcher setting "Vault" set to false.

  • Warning: Editing your OpenCore EFI incorrectly can result in a bricked install. Please ensure you have a natively supported version of macOS installed to boot into in case of issues.

Now that you've verified you can edit OpenCore safely, you'll need to mount the drive that OpenCore is stored on. To do this, download MountEFI (opens new window) and run it:

Select the drive you installed OpenCore to and mount it.

# Updating OpenCore icons

Head to EFI/OC/Resources/Image/ on your drive and you'll see all the custom icons. For Background.icns, we need to ensure the file matches the theme OpenCore has set so we add the prefix Modern to it:

Now reboot and you should see your updated icon(s)!

# Updating Mac Boot Picker icons

To update the Mac Boot Picker icons is actually quite simple, on the root of your drive simply drop the icon onto the root of the drive with the name .VolumeIcon.icns

Now reboot and you'll see the new icon!