You can use third-party software to convert Tik Tok videos to MP4 format. Here is a recommended software: Gihosoft Video Converter, which can help users quickly and easily convert Tik Tok videos to MP4 format. The steps are as follows:

1. Download and install Gihosoft Video Converter;

2. Click the "Add File" button and select the video to be converted from the video folder exported from the Tik Tok APP;

3. Select MP4 format in "Output Format";

4. Click the "Convert" button to quickly convert Tik Tok videos to MP4 format.