There are a number of different CC-licenses which impose different restrictions on how a work can be used so filtering by just "Creative Commons licenses" is no

There are a number of different CC-licenses which impose different restrictions on how a work can be used so filtering by just "Creative Commons licenses" is not very helpful. Openverse[1] provides filtering by specific CC licenses, and also for finding public domain images specifically. Disclosure: I am a maintainer for Openverse. [1]: https://openverse.org https://openverse.org