Lanto is a batch photo resizer. Simply drag photos over to Lanto. They will be converted to the format you desired. With intuitive user interface and powerful functions, you don't need to learn anything in order to use this application.
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
Enable snapd
On Debian 9 (Stretch) and newer, snap can be installed directly from the command line: