The size of a sound file is its length multiplied by its bitrate, so the way to shrink it is to lower the bitrate. This tool starts at 96 kbps, which roughly halves a typical MP3, and lets you go lower for voice recordings.
How to use the Audio Compressor tool
- Add the files you want smaller.
- Pick a quality; the lower the number, the smaller the file. Tick Mono for speech.
- Compare the before and after sizes and download.
Tips for the best result
- Music starts to sound dull below about 128 kbps; speech stays clear down to 64.
- A WAV saved as MP3 at 192 kbps is about a seventh of the size with no difference most people can hear.
Quick facts
| Price | Free |
|---|---|
| Works with | MP3, WAV, M4A, OGG, FLAC |
| Where it runs | In your browser, on your device |
| Account | Not needed |