There are various reasons to transfer photos from Dropbox to Google Drive. Photos in Google Drive can be managed by Google Photo. But how to move photos from Dropbox to Google Drive first? Few photos, you can download and then re-upload manually.
For large numbers of photos, we suggest you try a tool called MultCloud. At first, arrange photos in Dropbox needed to transfer into a folder. Then copy the folder to Google Drive directly via MultCloud. If you can’t move all of them at one time, set scheduled task in MultCloud please. Here is a tutorial: https://www.multcloud.com/tutorials/transfer-files-between-dropbox-and-google-drive.html. Update: You can also enjoy Sync Service since MultCloud 4.0 version.