There was once a time when a USB cable was the main way to sync important data. Now, iCloud Music Library—also known as Sync Library on newer Apple devices like the iPhone and iPad—makes it easy to sync and listen to your Apple Music library on almost all your devices, whether you're at home or in the office.
By turning it on or off, you can decide where you want to access your Apple Music and iTunes tracks, what versions you keep, and how to combine or separate streaming music from your personal music files. You're in control, and this guide will show you how to make the most of iCloud Music Library.
Part 1. What Is iCloud Music Library?
iCloud Music Library is Apple's built-in tool for keeping your music organized and available on all your devices. It comes as part of Apple Music and iTunes Match, so you don't need extra software to use it. If you subscribe to either service, it's usually turned on by default.
When it's active, any track you add to Apple Music or iTunes—whether you bought it, uploaded it, or streamed it—appears on all your devices signed in with the same Apple ID. You can listen to those songs online or download them for offline listening.
Part 2. What iCloud Music Library Does
iCloud Music Library updates automatically in the background. On some devices, like a Windows PC running iTunes, you may even see this process in action, with messages such as "iCloud Music Library – sending information to Apple" appearing near the Search tool. Add a song on your Mac, and it will show up on your iPhone or iPad without you having to do anything. If a song matches Apple Music's catalog, it's replaced with Apple Music's AAC 256 kbps version, the same format used for music streamed or bought from Apple's stores. If no match is found, your original file is uploaded instead, so nothing is lost.
iCloud Music Library works like a private music cloud that connects all your Apple devices. Here's what you can do with it:
- Access across devices: Add a playlist on your iPhone and see it appear automatically on your Mac or iPad.
- Upload music: Import tracks from CDs or other sources and upload them to iCloud. They'll be ready to stream or download on your other devices.
- Keep offline copies: Download a song on one device and have it available offline on your other devices too.
- Match songs: If Apple Music has the same track, you'll get the high-quality streaming version. If it doesn't, your own copy is stored online.
- Merge your music library: Subscription songs and personal uploads—like tracks stored in your computer's library—appear together in one place, so you don't have to manage them separately.
Part 3. How to Enable iCloud Music Library (Sync Library)
By subscribing to iTunes Match for $25/year or Apple Music for $11/month (or $109.99/year), you can store up to 100,000 songs in iCloud, across up to 10 authorized devices (including up to 5 computers). Songs purchased from the iTunes Store do not count toward this limit, but files from other sources must be smaller than 200 MB and shorter than 2 hours. If you require additional iCloud storage for other purposes (like backups), you can purchase more storage for an additional fee.
Subscribing to Apple Music or iTunes Match
Here's how to subscribe to Apple Music or iTunes Match and enable iCloud Music Library:
Subscribing to Apple Music
- Open the Music app on your iPhone, iPad, or Mac.
- Tap on Listen Now at the bottom of the screen.
- Tap Try It Free or Subscribe. Apple Music usually offers a 1-month free trial for new users.
- Choose your subscription plan: Individual, Family, or Student.
- Follow the on-screen instructions to complete your subscription.
- After subscribing, iCloud Music Library will be automatically enabled.
Subscribing to iTunes Match
- Open iTunes on your Mac or PC.
- Click on Store in the top menu bar.
- Scroll down to find iTunes Match and click Subscribe for $25/year.
- Sign in with your Apple ID and complete the subscription process.
- Once you've subscribed, iCloud Music Library will automatically sync your music library across all devices.
Note: Apple Music allows you to stream and download millions of songs, while iTunes Match focuses on uploading and syncing your personal music collection.
Adding More Storage to iCloud
If your iCloud storage is running low, you can easily upgrade to a higher storage plan. Here's how to add more storage:
- Open Settings on your iPhone or iPad, or go to System Settings on your Mac.
- Tap your name at the top, then tap iCloud.
- Tap Manage Storage.
- Choose the plan that fits your needs (starting at $0.99/month for 50GB).
- Follow the instructions to complete the upgrade.
This extra storage can be used for backups, photos, and files, alongside your music in iCloud Music Library.
Part 4. When to Turn On or Turn Off iCloud Music Library
iCloud Music Library—also called Sync Library—can be switched on or off at any time, depending on how you like to manage your music. The right choice comes down to how you use your devices, your storage space, and whether you want Apple to keep your music in sync automatically.
- When to Turn It On
- You use multiple Apple devices: Keep the same songs and playlists on your iPhone, iPad, Mac, or even Windows PC with iTunes.
- You want Apple Music everywhere: Any song or playlist you add appears almost instantly across all your devices.
- You want to mix Apple Music with personal songs: Imported tracks from CDs or other sources can sit alongside Apple Music's catalog in one library.
- You want offline listening across devices: Download a song on one device and have it ready for offline play on another.
- When to Turn It Off
- You want to keep music separate: Prevent Apple Music tracks from mixing with your personal library.
- You have limited storage: Stop automatic downloads from filling up your devices.
- You notice duplicate or missing songs: Avoid mismatched tracks or unexpected removals caused by syncing.
- You prefer manual control: Manage your music yourself using iTunes or Finder instead of Apple's automatic sync.
Bottom Line: What Happens If You Turn On/Off iCloud Music Library
Turn it on, and syncing continues, so you can stream or download your playlists across all your devices. It relies on an internet connection and your subscription status. This means you may occasionally need to check your library and verify the iCloud status of songs (like "Matched," "Apple Music," or "Uploaded") to fix any issues.
Turn it off, and syncing stops — Apple Music downloads tied to iCloud will be removed from that device, and any changes you make won't appear on your other devices until you switch it back on. Your streamed music won't be affected, only the downloads.
For example, if you often add playlists on your iPhone and expect them to appear on your Mac, leaving Sync Library off will prevent that. On the other hand, turning it off can be useful if you want to keep a device's music separate or save storage space. This way, you control exactly which music stays on each device.
Part 5. How to Turn On iCloud Music Library
For iPhone, iPad, or iPod Touch:
- Open the Settings app from your Home screen.
- Scroll down and tap Music.
- Under the Library section, toggle Sync Library to turn it on. If you subscribe to Apple Music or iTunes Match, iCloud Music Library will automatically sync your music across all devices.
For Mac (macOS Catalina or later):
- Open the Music app on your Mac.
- In the top menu bar, click Music, then select Preferences.
- In the General tab, check the box next to Sync Library.
- Click OK to save your changes, and iCloud Music Library will begin syncing your music.
For Windows PC (or Mac running macOS Mojave or earlier):
- Open iTunes on your PC or Mac.
- In the top menu, click Edit (Windows) or iTunes (Mac), then choose Preferences.
- In the General tab, check the box next to iCloud Music Library.
- Click OK to save your changes.
Part 6. How to Turn Off iCloud Music Library
If you prefer to manage your music manually or want to free up iCloud storage, you can turn off iCloud Music Library on any device. Here's how:
For iPhone, iPad, or iPod Touch:
- Open the Settings app from your Home screen.
- Scroll down and tap Music.
- Under Library, toggle Sync Library to turn it off.
- Confirm your choice - this will stop syncing your Apple Music library and remove any music that was not locally downloaded.
For Mac (macOS Catalina or later):
- Open the Music app on your Mac.
- In the top menu bar, click Music, then select Preferences.
- In the General tab, uncheck the box next to Sync Library.
- Click OK to apply your changes. Your music will no longer sync, but locally stored songs will remain on your device.
For Windows PC (or Mac running macOS Mojave or earlier):
- Open iTunes on your PC or Mac.
- In the top menu, click Edit (Windows) or iTunes (Mac), then choose Preferences.
- In the General tab, uncheck the box next to iCloud Music Library.
- Click OK to save your changes. Your library will stop syncing with iCloud, but music stored locally on your computer will remain.
Part 7. How to Sync Apple Music With or Without iCloud Music Library
How to Sync and Match Apple Music Library with iCloud
When you enable iCloud Music Library, Apple takes your existing music library and tries to match your songs to its vast database. The way this works is simple: iCloud Music Library scans your songs and checks if they are already available in the Apple Music catalog. If it finds a match, it links your song to the AAC version available in Apple's database (256kbps). However, if Apple can't find a match for a particular song, it uploads your original file in its current format to iCloud.
Once your library is matched or uploaded, you can access all your music across any of your Apple devices simply by signing in with your Apple ID. It also keeps everything synced in real-time - so if you add or remove songs on one device, those changes reflect on all your other devices.
What Happens if a Song Isn't Matched?
For songs that aren't matched, iCloud Music Library will upload the original version of your song, so you won't lose any of your music. But keep in mind that uploaded songs may take up some of your iCloud storage, especially if your music library is large. Also, if the file is too big (over 200 MB or longer than 2 hours), it won't be uploaded to iCloud.
If you want more detailed information on tracking the matching process with iCloud Music Library, you might want to check out another post we've written:

Wondering how to match your songs with iCloud Music Library on Apple Music or looking to stop Apple Music from matching songs? Explore now! If Apple Music mismatches songs, we've got you covered!
This guide helps break down the process and helps you decide to start or stop Apple Music to match songs.
How to Backup Apple Music Library Forever without iCloud
Due to the restrictions of Apple Music, Once you turn off the iCloud Music Library, you will lose all your Apple Music downloaded songs and you won't be able to play Apple Music offline anymore. So, if you still want to listen to Apple Music songs offline on your devices, you can do some tricks as below to back up Apple Music without the iCloud Music Library by downloading and converting Apple Music songs.
Here's a tool called ViWizard Apple Music Converter which can help you easily back up your Apple Music and iTunes playlists. ViWizard Apple Music Converter is a tool that aims in converting Apple Music to MP3, WAV, M4A, FLAC, and other open formats. This tool supports converting Apple Music at 30X faster speed and keeps the lossless quality. You can also open the format window to adjust the parameters of the output audio, such as sample rate, bit rate, channel, and volume.

Key Features of ViWizard Apple Music Converter
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- Convert Apple Music songs, albums, playlists, and artists into MP3 for easy access
- Preserve lossless audio, high-resolution lossless, and Dolby Atmos quality
- Strip DRM from Apple Music for unrestricted offline listening
- Save converted audio files while retaining full ID3 tag details
Part 8. iCloud Music Library FAQs
Why Isn't My Music Syncing Across Devices?
- Make sure your device is updated to the latest OS version.
- Make sure you're signed in with the same Apple ID on all devices.
- Make sure you have an Apple Music or iTunes Match subscription.
- Make sure Sync Library is enabled for each device.
What Happens If I Turn Off Sync Library?
Turning it off stops music from syncing across devices. Any Apple Music downloads tied to iCloud will be removed from that device, but your streamed music remains intact.
How Can I Keep Personal Music Separate from Apple Music?
- Store personal files in iCloud Drive and access them via the Files app.
- Separate Apple Music and personal tracks into different playlists.
- Consider using ViWizard Apple Music Converter, which lets you play music without syncing it to Apple Music.
Can I Force My Mac's Music Library to Sync?
- Make sure Sync Library is enabled on both Mac and iCloud.
- Use Consolidate Files in the Music app so all tracks are in the correct location.
- Check your library carefully — syncing can overwrite existing data if not done correctly.
What Should I Do If Sync Library Is Stuck or Not Updating?
- Check your internet connection.
- Make sure your device is up to date.
- Restart your device and try again.
- Remove and re-add tracks if necessary.
Is Sync Library a Reliable Backup?
Sync Library is great for syncing music across devices, but it isn't a true backup. For a real backup, ViWizard Apple Music Converter can convert and download your Apple Music library to MP3, unlocking the ability to save songs to USB or other devices.
Conclusion
If you want to turn off iCloud Music Library, you'd better know what it brings to you and what will you lose after the disabling. To summarize, you can only manually sync the Apple Music songs to other devices and cannot listen to Apple Music offline. So, you need a tool like ViWizard Audio Converter to convert Apple Music so that you can easily listen to Apple Music offline and sync to other devices you like.
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