Compress audio and MP3 files
Shrink podcasts, voice memos, lectures and songs by re-encoding them at a lower bitrate, right here in your browser.
Drop an audio file to squeeze
MP3, WAV, M4A, FLAC, OGG and more, up to 500 MB. Processed on your device.
Choosing a bitrate
- Music you care about: 128–192 kbps stereo.
- Podcasts and audiobooks: 64 kbps mono MP3, or 48 kbps mono M4A.
- Voice memos for email or WhatsApp: 32–48 kbps mono. A 10-minute memo lands around 2–4 MB.
Re-encoding a file that is already at a low bitrate won't make it sound better, and going lower again adds a second round of artefacts. Start from the best copy you have. Limits: files up to 500 MB; video files dropped here have their audio extracted.
Questions people ask
How do I compress an MP3 file?
Drop it on this page, choose a lower bitrate (96 kbps for music, 64 kbps mono for speech is a good start) and press Compress. The MP3 is re-encoded with LAME inside your browser.
Does compressing audio lose quality?
Yes, lowering the bitrate is lossy. At 128 kbps most people can't tell music apart from the original in casual listening; at 64 kbps music gets swishy but speech remains perfectly clear.
Can I turn a WAV into a small MP3?
Yes. WAV is uncompressed (about 10 MB per stereo minute), so converting it to 128 kbps MP3 makes it roughly 11 times smaller.
MP3 or M4A?
MP3 plays everywhere. M4A (AAC) sounds better at the same bitrate, especially at 96 kbps and below, and plays on all modern phones and browsers.