Compress MP3 files
Upload an MP3 file and shrink its size.
Quality
Upload an MP3 file and shrink its size.
The tool re-encodes your MP3 at a lower bitrate, trading some audio quality for a smaller file. You choose how far to push it: voice recordings stay perfectly intelligible at low bitrates, while music wants more breathing room.
Re-encoding an already-lossy MP3 always costs some quality, and shrinking is the only reason to do it. Good fits: getting attachments under email caps, audio for slow connections, voice archives where size beats fidelity. Poor fit: music you care about, which is better re-encoded from a lossless source.
Roughly proportional to the bitrate drop: a 320 kbps file re-encoded at 128 kbps lands near 40 percent of the original size.
Spoken word stays clear far lower than music. Try the lower options for podcasts and memos; you can always re-export at a higher setting.
No, your browser does the work and the file never leaves your machine.