But because MPEG-4 Part 14 is a container format, MPEG-4 files may contain any number of audio, video, and even subtitle streams, therefore it is impossible to determine the type of streams in an MPEG-4 file based on its filename extension alone. Some file managers, such as Windows Explorer, look up the media type and associated applications of a file based on its filename extension. M4A stands for MPEG 4 Audio and is a filename extension used to represent audio files. The output files will be automatically deleted on our server in two hours, so please download them to your computer or save them to online storage services such as Google Drive or Dropbox as soon as possible. You can right-click on file name and click 'Save link as.' to save the file. To compress all output files in a ZIP file, click ' ' icon on the right, then click 'Add to ZIP'. The output files will be listed in the 'Output Files' section. Please be patient while files are uploading or compressing. The batch compression automatically starts when files are uploaded. The settings are optional, you can close 'Settings' section by clicking the 'X' on the right.ĭrag multiple M4A files to the 'Choose Files' section.

You can also select 'Change specific audio parameters' option to set audio bitrate and sample rate.

M4A audio quality value can be 1 (lowest audio quality and highest compression) to 100 (best quality but least effective compression).

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