How to Merge Audio Files? Posted on by Introduction Free Merge MP3 has the ability to merge audio file. Now follow the steps below to merge your audio files: Download Now – It’s Free Merge Audio Files 1. Add audio files to the file list window. You can remove one or all files. 2. Choose an output format from MP3, WAV, WMA and OGG. 3. Adjust the output quality with the presets or specify the configuration parameters. 4. Click “Merge” button to choose an output directory and click “Save” to begin merging.