An important honesty note up front: this tool makes MP3 files, not ringtones. It cannot trim audio or export ringtone formats. The ringtone part happens on your phone, using its own built-in tools. This guide covers the whole path: convert, transfer, trim, set.
Choose the video and decide on the 20 to 30 second section you want. Ringtones are short by design, so a full song conversion followed by a trim works fine.
Use YouTube's Share button, then Copy link. A clean link converts without errors.
Paste the link into the converter and download the MP3. That is all this tool does, and it does it well. Convert it to MP3 now.
Send the file to your phone however you like: USB cable, AirDrop, email attachment, or cloud storage. Platform details: see the iPhone walkthrough or the Android walkthrough.
On iPhone, use GarageBand to trim the MP3 to 30 seconds and export it as a ringtone. On Android, use a ringtone maker app or your phone's sound settings to trim and set the file directly. The phone does the trimming, because that is the phone's job.
No. It produces MP3 files only. Trimming and ringtone export happen on your phone.
Around 20 to 30 seconds. iPhone ringtones cap at 30 seconds.
Yes. The same steps produce short MP3s you can assign to notifications or alarms.