How To Disable Google Photo Sync to Clean Up Your Gallery App:
1.Go to your device’s system setting and choose Google account that is associated with your device.how to delete photos from picasa
2.Now you will see all option check marked in that account, remove check mark from sysc picasa web albums, sync Google photos. That will Stop Google Photo Sync to your Google account to your device’sGallery album.
3. Now everyone will say that I have unchecked the Picasa album syncing from my device but it still showing images from my account to my device. Well, the process is not finished yet. Now go to setting> application manager> choose gallery from there.getting rid of picasa photos
4. Now you will see clear data option at that page.Tap on clear data option, that will ask you all of this application’s data will be deleted permanently. This includes all files, setting, accounts, database, etc.
Tap on ok button & you have done.It will Delete Picasa Photosthat are synced on your device.
5.Now refresh allow your devicegallery refresh, you may restart your device & open gallery. if you have stored lots of pictures and images on your device it will rebuild thumbnail for your gallery and show it to you
.See also : How To Delete Picasa Photos From Samsung Galaxy S5
If you are facing any difficulty doing that task or have any problem, feel free to comment below with your problem