If you wish to convert WMV to MP4 then simply use wmvtomp4.com

The site allows you to convert your WMV files to MP4, basically changing them from an old format to a newer format that is accepted by more tools and online websites.

If are worried about hassles then note that wmvtomp4.com doesn't require to register. It is free to use, there are no watermarks on the output file, and the conversion is done easily without hassles. You simply upload your file, wait a bit for it to convert and then you can download it. You can even do so for multiple files at once and simply download a zip file containing all your output files - in one click!

A screenshot from the site

Check out this screenshot from the site:

As you can see the instructions are very clear and everything is done with a few clicks of a button.

Is it safe to use?

Yes, the site is 100% safe to use. You can check its code and see there is nothing hidden behind it, so the output file you download from the site is 100% clean and provides you simply with a MP4 format of your original WMV video format. You can also use tools such as archive.org in order to view how the site was looking a few months ago and so on. This would allow you to ensure that if the site hasn't changed for months or even years - then you can rest assured it is 100% safe to use without any strings attached.