If you are looking for a full professional grade video editor which is also free, Hit Film Express is your best bet. The only con of using this software is the one which is same for any professional grade software, that is, you will have to invest a considerable amount of time in learning it. On the scale of video editor learning process, this one falls on the harder side. However, if you are ready to invest your time, Hit Film Express can become the only editing software that you are ever going to need. It has everything that you will need to support your expanding editing skills. The editor supports almost every know video and audio format and has over 180 visual effects which you can use. The company also keeps a great selection of free tutorials which can get you started. However, as I said earlier, you will need to invest a considerable amount of time in learning this one. Also, the editor is a little heavy on the resources so you will need a good system to run it smoothly.
You can also use the build-in video converter tools to freely convert video/audio format to another format. It is a non-linear tool, which means you can place video clips in the timeline freely. You can also export your video to IG, FB and YouTube, which is powerful as a free video editor. You can also edit 4K and HD videos. For this point, not every free video editor can do.
iMovie is one of the easiest video editing programs out there. With a couple of clicks and some dropping and dragging you can conduct high-quality edits that seriously enhance the quality of your video. And with One Step effects you can apply a variety of different editing techniques instantaneously to your whole video, with just one click. The audio editing capabilities are also a program highlight, with 19 different unique audio filters that allow you to easily edit sounds and even change voices. iMovie is considered a consumer-level editing tool, so it’s not at all hard to learn.