How do I set an MP3 as my ringtone on iPhone?

How do I make my own ringtone?

Drag and drop the custom ringtone file (in .m4r format) from your computer to the "Tones" section in iTunes. Click the "Sync" button to transfer the custom ringtone to your iPhone. On your iPhone, go to "Settings" > "Sounds & Haptics" > "Ringtone."

How do I put custom ringtones on my iPhone?

Is there a truly free ringtone app?

How do I set an MP3 as my ringtone on iPhone?

How do I turn a YouTube video into a ringtone?