I upload photos using Picasa. In Picasa Web I can see/edit tags. Google Photos help seems not to have any mention of "tags" at all. Am I missing something?
Google-photos – View/edit tags in Google Photos
google-photos
Related Solutions
Probably recently added by Google, it's now possible to edit the date of photos on photos.google.com itself. Simply open a photo, click on the 'i' information icon and there it is; an editable date.
If you have the Google Photos saved in your Google Drive, you should be able to install the Google Drive for Mac / PC to get the folder 'mounted' on your computer.
From there, you can use an application such as dupeGuru (which works on Mac and Windows). You should be able to scan the Google Photos folder within your Google Drive and find the duplicates.
dupeGuru Actions -- Do whatever you want with your duplicates. Not only can you delete duplicates files dupeGuru finds, but you can also move or copy them elsewhere. There are also multiple ways to filter and sort your results to easily weed out false duplicates (for low threshold scans).
Best Answer
No. Picasa has tags, Photos doesn't.