How to compress an MP3
Example: a 50 MB WAV recording becomes about 5 MB as a 128 kbps MP3; a 10 MB song at 320 kbps becomes about 4 MB at 128 kbps.
- Choose your audio file (MP3, WAV, M4A, AAC, OGG, FLAC).
- Pick Auto, Target size (MB) or Quality: High 192 kbps, Medium 128, Low 96, Smallest 64.
- Press Compress audio, listen to the result and download the MP3.
Private and free
Compression runs in your browser with the open-source FFmpeg engine - your audio is never uploaded. No sign-up, no watermark, no limits.
Questions
Is my audio uploaded?
No. Everything happens on your device.
Which quality should I choose?
128 kbps (Medium) sounds clear for music and is the usual choice. 64 kbps is fine for voice notes and podcasts.
Can I compress WAV to MP3?
Yes - any supported audio file comes out as a smaller MP3.
How do I make an MP3 under a certain size?
Choose Target size, set the MB and press Compress audio; the bitrate is set to fit.