The online video converter also supports to convert RMVB videos to MP4 at fast speed. Free Online Video Converter is a web-based video converter that can convert any popular video or audio files to MP4, MOV, FLV, AVI, MP3, AAC, and many more for free. It allows users to change files from RMVB to MP4 through the browser with ease.

Step 1. Visit https://www.free-videoconverter.net/free-online-video-converter/ and click on the Add Files to Convert button to activate the launcher.

Step 2. After that, import your RMVB files to this online tool. Then, choose the MP4 format under the Video tab. When you are ready to make the conversion, hit on the Convert button to start the conversion. Once the conversion is over, the converted files will be saved to your computer automatically.

How to Convert RMVB to MP4 with RMVB to MP4 Converter: https://www.free-videoconverter.net/mp4-converting/rmvb-to-mp4/