How to improve the video quality?

My friend emailed me a video he filmed on his iphone, and when I it from my email and watched it on my computer, the quality was completely fine. But, when I uploaded it to Facebook, it was grainy, and not of the same quality. I did notice the video he filmed on his iphone was narrower, and the one on Facebook was expanded to fit, so that must be why the video is so grainy. Is there any way to improve the quality of the video when I try to upload it to Facebook, again? Is there any free software I could use - preferable an online editing site (I don't want to pay for anything I'll only use once).

You may refer to this website, it collects 10 free online video editing software, you don't have to download and install anything. They are not as professional as the software you need to install on your computer, but they are simple to learn and easy to use. Hope it helps. Contact me if you have any other question.

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