Several ways to add your photos in your gallery:
  - Direct upload inside your web browser is the
  simplest and most immediate way. It depends on your browser capabilities
  and your web server. For a huge quantity of photos or in case you encounter some problem,
  the other methods are just waiting for you!
Go to Direct Upload
  - You can find many applications, for desktop or mobile devices, to add photos in your Piwigo.
Go to applications
  - FTP transfer is the most recommended way to add a
  very large collection of photos with a minimum number of clicks. Follow
  the guide to prepare your photos. The FTP method let you control precisely
  the physical organization of your photos on your server.
Go to FTP
 
For more information on adding photos to Piwigo, read the dedicated article in our online documentation: Importing photos into Piwigo.