Audio

Compress Audio

Reduce an audio file’s size by lowering its MP3 bitrate.

Audio file

Choose a file to convert. It's processed locally — never uploaded. Tip: add several files to convert them all at once.

Settings

Output

Result appears here after you select

{ } How to use

  1. Choose the audio file.
  2. Pick a bitrate. Lower means a smaller file and less detail.
  3. Select Process, then download the MP3.

{ } How it works

Compress Audio works on the file you upload. Adjust the options, then select Process ▸ and it runs entirely in your browser — nothing is uploaded to a server — then shows the result in the Output panel.

Inputs

  • Audio file — upload a file (audio/*); it is read locally in your browser
  • Bitrate — choose one — 96 kbps, 128 kbps, 192 kbps (default: 128 kbps)

Output

A downloadable MP3 file — use the Download button in the Output panel.

{ } Common uses

  • Get a recording under an upload or attachment limit.
  • Shrink a long spoken-word recording, where a low bitrate costs very little.
  • Reduce the size of a podcast episode for distribution.

{ } Limitations

  • This re-encodes to MP3, so compressing a file that is already an MP3 puts it through a second lossy encode. Two passes sound worse than one pass straight to the lower rate — go back to the original and convert it once, if you still have it.
  • The output is always MP3, at a constant bitrate, whatever went in.
  • The bitrate is the only lever. Sample rate and channel count are left alone, so a stereo file stays stereo even where mono would have halved it again.

{ } FAQ

Is my data uploaded to a server?

No. Everything runs locally in your browser — your files never leave your device.

Can I process more than one file at once?

Yes — add several files and they’re all processed and downloaded together as a ZIP.

Is this tool free?

Yes — it’s completely free and needs no sign-up.

How small can I make it?

The size is essentially the bitrate multiplied by the duration, so 96 kbps is about half of 192. For speech, 96 kbps is usually perfectly acceptable. For music it is where the loss starts to be audible on decent headphones.