The first step: Open the Swift Video Converter software and click the video conversion option

The second step: Click the add file and add folder options to import the MP4 format file to be converted. If there are few MP4 files that need to be converted, you can select the Add File option to add the files that need to be converted one by one. If there are many files that need to be converted from MP4 to MP3, you can create a folder, then put all the files that need to be converted from MP4 to MP3 into the folder, and click the Add Folder option to add the folder.

Step 3: After adding the file, click the output format option at the bottom left to choose to convert the file to MP3 format

You can also choose to click Add by output format to directly select the export file as MP3 format and add the video files that need to be converted to MP3 format.

Step 4: Finally, click the Convert All or Convert (Extremely Fast) option to convert the MP4 video file to MP3 format. Then export the MP3 format file.

The converted file properties are as follows: