Compress Audio
Shrink an audio file by reducing its bitrate, with an honest before-and-after size report.
How it works
- 1
Drop in an audio file — it stays on your device, nothing is uploaded.
- 2
Pick a compression target, output format, and any sample-rate or channel changes.
- 3
Download the compressed file. The tool reports the real before-and-after size.
Questions
How is the compression level chosen?
The three presets map to fixed bitrates: Small (64 kbps) keeps the file as small as possible, Balanced (128 kbps) suits most music and podcasts, and High quality (192 kbps) is close to transparent for most listeners.
Which output format should I choose?
M4A (AAC) gives slightly better quality per kilobyte and works on all modern devices. MP3 has broader legacy compatibility. Both are lossy compression formats.
What if the output is larger than the input?
That can happen when the source is already heavily compressed or very short. The tool always reports the real sizes honestly.
Does my audio get uploaded?
No. All processing happens in your browser. Your file never leaves your device.
More audio tools
Volume Changer
Raise or lower the volume of any audio file and see the resulting peak level before you download.
Fade In
Gradually bring an audio file up from silence at the start over a duration you choose.
Change Speed
Speed up or slow down an audio file by resampling it — note that pitch changes along with tempo.
Trim Audio
Cut an audio clip to exactly the section you want by typing a start and end time.
Convert to WAV
Turn any audio or video file into an uncompressed WAV, with optional sample-rate and channel conversion.