1. First, open iTunes on your computer, click the menu button in the upper left corner of iTunes, and select "Add File to Library" from the pop-up menu, or press the shortcut key "Ctrl+O" on your keyboard.
2. Then in the pop-up file selection window, find the ringtone prepared in advance. After making your selection, click Open.
Note: The length of the ringtone cannot exceed 40 seconds, otherwise the subsequent synchronization will be unsuccessful.
3. Next, connect the iPhone to the computer. When iTunes recognizes and connects the iPhone, click the iPhone button in the upper right corner of iTunes.
4. Then, click "Ringtone", click "Synchronize Ringtone", and finally click "Select Ringtone" to see the new ringtone just added from the computer.
Select the ringtone you want to synchronize, and finally click the "Apply" button in the lower right corner of iTunes to synchronize the ringtone.
5. After 5.iTunes and iPhone are synchronized, we will go back to iPhone. Click the "Settings" icon, find "Sound", and click Enter.
6. Then, click the sound option and click "ringtone" to enter, and you can see the new ringtone imported from iTunes before.