Compress MP3 Files — Free

MP3 compression reduces audio file sizes by re-encoding at lower bitrates while maintaining acceptable listening quality. Our compressor uses advanced encoding algorithms to achieve maximum size reduction with minimum perceptible quality loss, perfect for creating portable music libraries or meeting upload size limits.

Bitrate selection controls the compression level. Original MP3s often use 320kbps, while 128kbps produces files roughly one-third the size with quality that's sufficient for casual listening. For voice recordings and podcasts, 64kbps provides excellent speech clarity at very small file sizes. Variable bitrate (VBR) encoding optimizes quality dynamically throughout the track.

Podcasters compress episodes for hosting platforms with bandwidth limits. Musicians create smaller preview versions of tracks for email sharing. DJs compress music libraries for mobile devices with limited storage. Language learners compress audio lessons for offline mobile use. Audiobook listeners compress recordings for better portability.

Our compression preserves ID3 tags including title, artist, album, and cover art. Playback in all MP3 players and devices is guaranteed. The encoding uses the LAME encoder, the gold standard for MP3 encoding quality. Preview listening lets you verify quality before downloading the compressed version.