Choose Files:

Drop MP3 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 MP3 audio quality first. MP3 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 MP3 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:

MP3 (formally MPEG-1 Audio Layer III or MPEG-2 Audio Layer III) is a coding format for digital audio. In the aspects of MP3 pertaining to audio compression—the aspect of the standard most apparent to end-users (and for which is it best known)—MP3 uses lossy data-compression to encode data using inexact approximations and the partial discarding of data. This allows a large reduction in file sizes when compared to uncompressed audio.

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.