ImTOO iPhone Ringtone Maker is exactly what its name implies: a program designed to help you create tones for your iPhone. This application not only lets you convert any audio file from your Mac to M4R files, but it also enables you to extract audio contents from your videos and export them as ringtones for your Apple mobile phone.
As you probably guessed, this utility features a built-in option to trim the input files. This way, you can extract the exact segments from your songs or videos and save the results as ringtones.
What's more, you have access to an integrated audio player which comes in handy when selecting the starting and ending points of the input files. You can also pre-listen the trimmed segment before launching the conversion process.
In my testing, the application worked flawlessly. It didn't slow down the performance of my Mac when importing and editing the input files and immediately offered me the quality output files I needed.
Another advantage is that it offers me an option to automatically import the ringtones to my iTunes library.
As a conclusion, I'd say it's definitely worth buying this app for your Mac if you own an iPhone and wish to change your default ringtone. Plus, it comes with an affordable price.