Remove everything is best before posting publicly. Remove location only keeps the dates and camera info, and Custom lets you pick fields such as device and lens, software or author. You can also set a new date and time, or move the location instead of deleting it. Keep originals decides whether the originals stay in your photo library after the clean copies are saved, and your phone asks you to confirm before anything is deleted. Everything is read and cleaned on your phone, so coordinates are never sent anywhere.
Does it change the photo?
No. Only the metadata changes.
What does Remove GPS keep?
Date and camera info.
Does it work in batches?
Yes, with Pro.
Which fields does the report check?
Location, device model, camera settings, date and time, software, and author or copyright. Each one shows how many of your photos carry it.
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