iCloud: What is iCloud Notes?
You can use Notes on iCloud.com to capture a quick thought or save something important or interesting for later. With the Notes app on iCloud.com, you can quickly and easily create a new note and review your existing notes. With the Notes app on your iOS devices or your Mac, you can review your iCloud notes and create more. And you can take your iCloud notes with you on your iOS devices, your Mac, and anyone’s Mac or Windows web browser.
Note: Notes on iCloud.com uses only the notes stored in iCloud, not the notes in other accounts you may have, such as a Yahoo! or Google account. However, on your iOS devices and your Mac, you can set up Notes to use iCloud and other accounts.
If you’re using another iCloud app, you can switch to Notes by clicking the app’s name at the top of the iCloud.com window.
When working with Notes on iCloud.com, make sure you use a browser recommended in the Apple Support article System requirements for iCloud.
The first time you use Notes on iCloud.com, you may get a message that says an iCloud email address is needed. This indicates that you haven’t set up iCloud Notes on your iOS device or Mac. To do that, sign in to iCloud on your iOS device or Mac, and turn on the Notes feature. If your device has iOS 9 or later or OS X 10.11 or later, you’re now using upgraded iCloud notes. If you turn on iCloud Notes on a device with an earlier version of iOS or macOS, you’re asked to choose an iCloud email address for a free iCloud email account. The email account will be used to store your iCloud notes, and you won’t be using upgraded iCloud notes.
Note: To use all iCloud Notes features, upgrade your iCloud Notes account and upgrade your devices so they use iOS 9 or later or OS X 10.11 or later.