By default, macOS adds significant latency between copying and pasting. For example Command-L-C-T-V no longer works to clone the current browser tab. Also maybe Apple sends everything on your clipboard to phone home.

I attempted to disable this using the System Preferences but there is no obvious solution there.

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I do NOT want this. How do you disable it?

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    Sends to Apple? Everywhere I searched says that it's limited to the LAN only. – user1686 Sep 14 '16 at 17:57
  • Documentation is spotty but AppleInsider and other places are talking about "uploads to iCloud". Perhaps those were misinformed. – William Entriken Sep 14 '16 at 17:59
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    This is the most frustrating new "feature" especially when you're doing dev work! – David Wong Sep 15 '16 at 10:09
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    @FullDecent: The iCloud account is only used for verifying that both devices belong to the same person. arstechnica.com/apple/2016/09/… – user1686 Sep 15 '16 at 10:16

Universal Clipboard is a part of the Continuity suite of features, specifically a sub-feature of Handoff. The only way to disable it is to disable Handoff entirely.

Mac: Go to System Preferences > General > uncheck Allow Handoff

iPhone: Go to Settings > General > Handoff > uncheck Handoff

Data does not travel to Apple's servers or even over the internet. Devices advertise availability to each other via Bluetooth and data is transmitted over Wi-Fi, but only on the local network.

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    Well that's annoying. The pasteboard is causing lags while typing on iOS while simultaneously doing dev work on the computer....... – iAdjunct Jul 21 '17 at 2:04
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    Who the hell came up with this? This is not even remotely secure. I didn't even know it was enabled until today. – Chaim Eliyah Apr 5 '18 at 0:50
  • Merely doing this is not enough. You need a powerful application firewall like LuLu to block the process EVEN if you have "Handoff" turned off in macOS like I already did: i.imgur.com/33omphz.png – user608046 Oct 1 '20 at 10:57

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