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Select a group of nonadjacent photos or videos: Command-click (on a Mac) or Control-click (on a Windows computer) the items you want to include.
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You can also drag to enclose them within a selection rectangle. Select a group of adjacent photos or videos: Click the first one, then hold down the Shift key while you click the last one. Select a single photo or video: Click it.
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"You can select a single photo or video or multiple photos and videos. Using the iCloud website, you can select and delete multiple photos at a time, which might help if you have a large amount to delete: Delete photos and videos on
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To answer your question, there's not a tool that deletes duplicates photos specifically. I see you want to know about deleting duplicated photos in iCloud, and it sounds like you may be viewing your photos on the website.
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