Too big to email or upload? Re-encode the MP3 at a lower bitrate and see the new size before you download.
Convert MP3 to MP3
MP3, WAV, M4A, AAC, OGG, FLAC, MP4, MOV and more · up to 500 MB
Files are processed in your browser and never uploaded.
One or more files; other formats work too.
64 kbps for speech, 96–128 kbps for music.
Each file is re-encoded in your browser.
The new size shows before you download.
Fit under 25 MB attachment limits.
Speech stays clear at 48–64 kbps.
Compress a whole folder of recordings.
Files never leave your device.
An MP3's size depends almost entirely on its bitrate and length: size ≈ bitrate × seconds ÷ 8. A 4-minute song at 320 kbps is about 9.6 MB; at 96 kbps it is under 3 MB. Lowering the bitrate is the most effective way to make an MP3 smaller.
For speech (lectures, voice notes, podcasts) 48–64 kbps sounds clear. For music, 96–128 kbps is a good balance; below that, cymbals and reverb start to sound watery.
Compressing an MP3 always loses some quality, so keep the original. To shorten a file instead, cut out the part you don't need with the audio cutter.
Edit, convert and make music in your browser.
Sign up and get 3 free credits, enough for your first two songs. Check in on later days to collect more.
No credit card needed.