MP3 Compressor

Batch compress MP3 online free without losing quality.

*Tips: To learn more, please click how to compress video files with ease >>

compress audio

How to Compress MP3 Online With 3 Easy Steps?


Step 1: Upload Audio Files

Add MP3 file(s) to compress MP3 file online free.


Step 2: Compress MP3 Online

Choose MP3 quality and click COMPRESS to start compressing.


Step 3: Save the File

Download the compressed MP3 or save to Dropbox.

Why choose Online UniConverter to compress MP3 files?

Easy to Use, Convenient to Share

Online UniConverter (originally can batch compress MP3 via a web browser on Windows, Mac or Linux system, without any downloading. It enables you to save MP3 to Dropbox and share it directly by Facebook, YouTube, or other devices.

Many Input Formats

Select MP3 compression settings from 320Kbps, 256Kbps, 128Kbps, 64Kbps, to 32Kbps, which will result in your output size.

Smart Output Settings

Smart MP3 compressor to reduce MP3 file size online with one click, further customization like video resolution, output size, and format are also available.

No Ads Added, No File Limits

Compress MP3 without ads added, you can shrink MP3 file one by one without quantity limit after sign up.

Privacy Security

Online UniConverter (originally is a secure HTTPS (SSL) connection website, so you can securely upload your MP3 files. All the uploaded and compressed MP3 files are automatically removed from our serves after a few hours.

Any Output Quality & Format

You can compress MP3 to WAV to reduce MP3 file size, or convert to M4A, AAC, FLAC, M4B, OGG, and APE for special devices.

Information about MP3 audio file

File Extensions .mp3
Description MP3 is a standard audio format developed by Moving Picture Experts Group and uses MPEG-1 and MPEG-2 standardizations. MP3 uses lossy data compression, meaning that it loses quality over time. This sound format comes with a .mp3 filename extension and is today the most common audio format on websites and multimedia players.
Associated Programs Windows Media Player
iTunes, Mplayer
VLC Media Player
Developed By Moving Picture Experts Group
MIME Type audio/mpeg
Useful Link What is an MP3 file

Edit Your Video Files Online in Seconds.

A feature-packed online program, trusted by millions.
View More Tools online tools