It's already been possible to open up web pages across multiple devices, but now that functionality has been extended further. With macOS Sierra and iOS 10, when you copy a link on one device, it's uploaded to iCloud and available on all other devices where you're signed in with your Apple ID. You can do things like look up a recipe on your Mac, copy the text, and paste it on your iPhone, or copy a photo from an iPhone to an iPad.
Using the feature is as simple as copying something on one device, switching over to another device, and hitting "Paste." It can sometime takes a second or two for the copy to register, but it works seamlessly. There are no visual indicators for Universal Clipboard -- it's all behind the scenes.
Apple has implemented an expiration for Universal Clipboard, so you only have a few minutes to paste something to another device once it's been copied. After that expiration time, which appears to be about two minutes, cross-device paste stops working and will need to be reactivated with another copy.
There are limitations on what can be copied where. Text can be copied almost anywhere on a Mac or iOS device, but images are somewhat more limited and will need to be copied into an app, like Pages, so it isn't a solid alternative to AirDrop for photo file transfers.
Universal Clipboard is a Continuity feature, so to get it to work, you will need to be signed into the same Apple ID across all devices. Bluetooth will also need to be turned on for the feature to work, and Bluetooth LE is required. The following Macs work with Universal Clipboard:
- MacBook (Early 2015 or newer)
- MacBook Pro (2012 or newer)
- MacBook Air (2012 or newer)
- Mac mini (2012 or newer)
- iMac (2012 or newer)
- Mac Pro (Late 2013)
Continuity features are sometimes unreliable, and there have been reports about spotty performance with Universal Clipboard during the beta testing period. Sometimes it helps to sign in and out of iCloud to restore functionality, and you'll need to make sure Handoff is activated on your iOS device (Settings --> General --> Handoff).
Aside from a Bluetooth connection and the same Apple ID, there are no other requirements. Wi-Fi is not necessary, as Universal Clipboard will work with cellular data.
Previously introduced Continuity features allow users to do things like make and answer phone calls on their Macs, get SMS messages on the Mac, and transfer tasks from one device to another with Handoff. Other new Continuity features in macOS Sierra include Apple Pay on the web and Auto Unlock with Apple Watch.
macOS Sierra is available as of today and can be downloaded from the Mac App Store.