// convert · tool 06
Compress Audio
Shrink audio files to a fraction of their size. Pick a bitrate, compare before and after, download the result.
Drop your audio file here
MP3, WAV, M4A, OGG, FLAC and more — or click to browse
[ drop works anywhere on this page ]
How audio compression works
This tool re-encodes your file as MP3 at the bitrate you choose. Lower bitrates throw away more audio detail in exchange for smaller files. The engine is FFmpeg running as WebAssembly inside your browser — the first compression downloads it once (~30 MB with a live byte counter), then it's cached. Because nothing is uploaded, even a 200 MB WAV compresses without a single byte leaving your device.
Bitrate cheat sheet
- 320 kbps — archive-grade music; barely smaller for already-compressed files.
- 192 kbps — transparent for most listeners; a great music default.
- 128 kbps — solid everyday quality at roughly 1 MB per minute.
- 96 / 64 kbps — voice memos, podcasts and audiobooks where size matters most.
Common uses
- Fitting voice recordings under email or messenger attachment limits.
- Shrinking podcast episodes before publishing.
- Reducing storage used by lecture or meeting recordings.
FAQ
How much smaller will my file get?
It depends on the source. A WAV compressed to 128 kbps MP3 typically shrinks by 85–90%. An MP3 already at 128 kbps won't get meaningfully smaller without losing quality.
Which bitrate should I choose?
192 kbps is transparent for most music. 128 kbps is good everyday quality at about 1 MB per minute. 96 and 64 kbps are best for voice, podcasts and audiobooks.
Does compressing reduce audio quality?
Yes — MP3 is lossy, so lower bitrates discard more detail. The before/after readout helps you balance quality against size.