Open Google Photos on the web or in the app
Select the photos you want to delete
Click or tap the trash can icon
Confirm the deletion
Go to Trash or Bin
Empty Trash or Bin to permanently delete the photos
Repeat the selection and deletion steps until all photos are removed
If needed, use the web version to select multiple photos faster
If you want to delete everything, select all available photos in batches and delete them
Empty Trash or Bin again after each batch if you want immediate permanent removal