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PowerPhotos is a very useful macOS utility that makes it possible for you to efficiently organize your pictures using the native Photos app introduced by Apple with the launch of OS X 10.10.3. PowerPhotos can also guide you through the somewhat lengthy and annoying process of migrating your iPhoto or Aperture libraries to the Photos app.

Note that, if you have photo libraries created using iPhoto 7 or earlier, you will have to download the iPhoto Library Upgrader, so that the libraries can be upgraded to a newer format that is compatible with more modern versions of iPhoto. This way, you will be able to migrate the upgraded photo libraries within the Photos app.

Instead of being limited to putting all your photos in a single library, PowerPhotos can work with multiple Photos libraries, giving you many more options for how to organize your ever growing photo collection.

Splitting your photos between multiple libraries helps Photos open more quickly, lets you archive older photos, store some of your collection on an external hard drive, and reduce storage space used by iCloud Photo Library. You can split your library by copying albums and photos with a simple drag and drop. PowerPhotos will take care of copying the photos and retaining their metadata, including keywords, descriptions, titles, dates, and favorite status.