If you have a Mac Video to iMovie converter, you can import any formats video to iMovie and edit them for yourself. As we know, iMovie is a powerful movie editing software for Mac users, but what confused they is you can't import many videos which you wanted because of the video formats issues.
iMovie supports very limited video formats such as MP4, H.264, MOV, etc. So you must convert video to iMovie first. But now, you can solve this problem easily by using Mac Video to iMovie Converter. Mac Video to iMovie Converter allow you convert most video to iMovie, you can convert AVI to iMovie, convert WMV to iMovie, convert FLV to iMovie, convert MKV to iMovie, etc.
Not just conversion, with Mac Video to iMovie Converter, there are some versatile editing functions for you, you can merge several video or movie files into one, resize output video or tailor output settings, extract audio for iPad, iPhone, iPod, or other portable device.
Step by step tutorials for you to import video into iMovie on Mac:
Step 1. Add video files to Video to iMovie Converter
Download Video to iMovie Converter, install and run it. Click "Add files" button or drag videos into it.

Step 2. Select iMovie .mp4 as the output format
Select profile drop-down list to choose ".mp4" as the output format.
Step 3. Start converting
When all settings are done, click the "convert" button to start convert video to iMovie.
Step 4. Import video into iMovie
Launch iMovie, go to "file > import movies" to import video into iMovie directly.