To get to the Photos Repair Library tool on your Mac, follow these steps:

How To Repair Photos Library On Mac

1. If Photos is open, close the app. Then, while you click to open Photos, hold down the Command and Option keys at the same time.
2. In the window that opens, click Repair to start the repair process. You might be asked to enter your user account password.

The Repair Library tool analyzes the library's database and repairs any inconsistencies it detects. Depending on the size of your library, the repairs might take some time. When the process is done, Photos opens the library.

Computer Repair Photos

If you repair a library that's used with iCloud Photos, iCloud checks the library after the repair process completes to ensure everything is synced correctly.

If the Photos app on your Mac is open, choose Photos Quit Photos. Select the Photos Library that need repairing in the Finder. Press Option-Command and double-click the selected Photos Library. In the Repair Library window, click Repair to rebuild your photo library. Good luck for your library repair. OfficeRecovery Online is a breakthrough cloud-based service for repairing corrupted files: documents, spreadsheets, pictures and databases. In a few moments after uploading a damaged file, the user is offered free and paid options for downloading the results of recovery.

Photos Repair Library Permissions

If these steps still don't work, or you can't open the repair tool, contact Apple Support.