MP3 Compressor
Shrink MP3 files by re-encoding at a lower bitrate · runs on your device · nothing uploaded
Drop an audio file here
or click to choose (MP3, M4A, WAV, FLAC, OGG)
Up to 500MB · one file at a time
Common questions
How much smaller will my MP3 be?
Depends on the original bitrate. A 320kbps MP3 compressed to 128kbps shrinks by about 60%. A 192kbps to 96kbps saves around 50%.
Will the quality drop?
Yes, but how much depends on the target bitrate. 128kbps sounds near-original for most music, 96kbps is OK for streaming, 64kbps is for voice recordings only.
Is my audio uploaded?
No. Everything happens in your browser with WebAssembly. The file never leaves your device.
Can I also use WAV or FLAC files?
Yes. Any format your browser can decode (WAV, FLAC, M4A, OGG) will be converted to MP3 at your chosen bitrate.
What is the maximum file size?
500MB per file. Larger files may freeze your browser, especially on mobile.