Part 1: Convert YouTube to MP4 Videos on Mac (Free)
If you already have downloaded YouTube videos to your local hard drive. You can use VLC player to play the FLV videos.

To import YouTube clips to iMovie, iPad, iPhone, you need to convert YouTube to MP4 on Mac, because MP4 is widely supported by many popular portable devices like iPad,iPod,Xbox etc.

This professional yet easy-to-use YouTube Video Converter for Mac gives you a hassle free experience. After conversion, you can also use them on your iPad, iPhone or other devices.

• Download Intel version

Step 1.Add YouTube files to the program. Drag and drop YouTube videos to the YouTube MP4 Converter for Mac
Step 2.Select MP4 as output formatin the format drop-down list.
Step 3.Hit “Convert” button to start YouTube to MP4 conversion on Mac OS X

Part 2: Download and Convert YouTube to MP4 on Mac
With Part two , you can download and convert YouTube to MP4 on Mac in one go. To do that, the app you need is the professional YouTube download and converting software: iTube Studio for Mac

• Download Intel version

Step 1: Launch Safari and go to YouTube.com. The Download button will show up at the top left corner of the video when it is detected on the webpage. Click the button and let the YouTube download wizard to do the thing for you.

Step 2: Click Library on the left side of the iTube Studio window to see the downloaded videos on the right. Check the item(s) you would like to convert, and hit the Convert button at the bottom of the window to convert YouTube to MP4 for Mac

Step 3：Choose MP4 from output format list

If you want to import the output video to Apple devices like iPad, iPod, iPhone and more for convenient playback, you can choose according to which Apple devices you have.

Step 4: Hit OK and let this smart app to do the rest for you.