I have try some top free video converters in the internet, here's some pros and cons of them.

1. Any Video Converter
Pros:
1. Multi-language;
2. Convert video between any formats freely;
3. Able to download online videos;
4. Burn video to DVD or AVCHD DVD;
5. Rip and extract audio from CDs and videos;
6. Make animated GIF from video.


Cons
The output format & device options are too complicated and technical for average users.

2.Free HD Video Converter Factory
Pros
1.Completely free. No hidden fees;
2. 6X faster converting speed than other video converters;
3. It supports converting SD video to HD video;
4.Download videos from YouTube and more video sites with best quality;


Cons
The software only supports English language.

3. HandBrake
Pros
1. Free and open source;
2. Convert video from nearly any format;
3. Multi-Platform (Windows, Mac and Linux).

Cons
1. Limited output formats and devices;
2. Not stress the focal points;
3. Sound - tracks out of sync / not in sync with the picture;

Hope you can choose best free video converter 2015 for better enjoyment.