Choose Files:

Drop M4A files here

Settings:

Output Files:

To compress all output files in a ZIP file, click "" icon on the right, then click "Add to ZIP". To download one single file, simply right-click on file link and click "Save link as...".

File Name Original Size Output Size Size Compressed Actions

Steps:

  1. Settings

    Set M4A audio quality first. M4A audio quality value can be 1 (lowest audio quality and highest compression) to 100 (best quality but least effective compression). You can also select "Change specified audio parameters" option to set audio bitrate and sample rate. The settings are optional, you can close "Settings" section by clicking the "X" on the right.

  2. Add Files

    You can drag multiple M4A files to the "Add Files" section. Each file can be up to 200m.

  3. Compressing

    The batch compression automatically starts when files are uploaded. Please be patient while files are uploading or compressing.

  4. Output Files

    The output files will be listed in the "Conversion Results" section. To compress all output files in a ZIP file, click "" icon on the right, then click "Add to ZIP". You can right-click on file name and click "Save link as..." to save the file. The output files will be automatically deleted on our server in two hours, so please download it to your computer or save it to online storage services such as Google Drive or Dropbox as soon as possible.

About:

M4A stands for MPEG 4 Audio and is a filename extension used to represent audio files. Some file managers, such as Windows Explorer, look up the media type and associated applications of a file based on its filename extension. 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. In response, Apple Inc. started using the .m4a filename extension for MP4 containers with audio data in the lossy Advanced Audio Coding (AAC) or its own Apple Lossless (ALAC) formats.

The exclusive "Overall Audio Quality" option on our website is inspired by "JPEG Quality" option in image compression. It's more intuitive than setting audio parameters such as audio bitrate or sample rate etc.