The two free ways to resize mp4 without any watermark issue: using either Windows Movie Maker or VLC player on your Windows 10 PC. For VLC, just open the software, click on Tools from the bar at the top of the interface then Effects and Filters. This is open a new window, click on the Video Effects tab, and select Crop. For the last step, you now have to input the values. If you don’t like to resize video on Windows 10 in these two ways, you can also choose some advanced methods or resize video online, many websites offer the free service.