Compress MP3
HomeMake an MP3 smaller by re-encoding at a lower bitrate. Default 128 kbps; optional mono. Runs in your browser. Your file never leaves this device.
- Choose an MP3, WAV, M4A, or any audio file
- Pick a lower bitrate, or Best for → Voice (mono, 64 kbps)
- Click Compress and wait for re-encoding
- Preview the smaller file, then download
FAQ
Lower bitrates remove detail. For speech, 96–128 kbps usually sounds fine. Music prefers 160+.
It mixes stereo to one channel. At the same MP3 bitrate the file is the same size, but mono spends all of it on one channel, so speech still sounds clear at a lower bitrate like 64 kbps. Turn it on under Advanced settings, or pick Best for → Voice.
No. Re-encoding happens on your device with a local MP3 encoder.
Yes. Drop it in and it is re-encoded straight to a smaller MP3. No need to convert first.