In the opened itunes, click "File" in the menu bar, and select "Add File to Library" in the drop-down menu bar of the file.

Select the music file and add it to the Itunes library

Then you can find the added music file in the music in the iTunes profile:

Select the added music Right-click the file to open the menu bar, click "Show Introduction"

After clicking, a tab will pop up. Find the "Options" tab, check the start time and stop time, and fill in the required information in the fill-in box. The start and stop time of the ringtone segment. Just click "OK".

Click the original music file again, right-click to open the menu bar, and click "Create AAC Version"

At this time, you can see that iTunes is converting in the status bar

After conversion, a music file with the same name will appear again, but you can find from the time that this music file is the length of the music file you just needed.

Click on the newly generated music file, right-click to open the menu bar, and click "Show in Windows Explorer"

A folder will open containing the required ringtone file. , but the format of the ringtone file is ".m4a"

Modify the file suffix. Right-click to open the file menu bar, select Rename

and then change the suffix to the required format, such as ".mp3", ".m4r" (iphone ringtone), etc.

There will be a renaming prompt, click "Yes"

The ringtone is ready