Audio tool · Free
Audio Compressor
Shrink audio files for WhatsApp, email and uploads by lowering bitrate and optionally converting to mono.
- Processed on our server — deleted when processing finishes
- Input: mp3, wav, m4a, aac, ogg, flac, opus → mp3
- Up to 50 MB per file
How to use Audio Compressor
- 1
Add an audio file.
- 2
Choose a compression level and whether to convert to mono.
- 3
Click Compress and download the smaller MP3.
About this tool
Voice notes, podcasts and interview recordings can be surprisingly large. The compressor re-encodes audio as MP3 at a lower bitrate and can mix down to mono, which roughly halves the size again for speech. Choose a preset based on how the audio will be used.
Frequently asked questions
Which setting is best for voice recordings?
Strong (64 kbps) with mono is usually clear for speech and produces very small files.
Will music sound worse?
At lower bitrates, yes — especially cymbals and high frequencies. Use Light (128 kbps) stereo for music.
What format is the output?
MP3, for maximum compatibility.
Is Audio Compressor private?
Your file is uploaded over an encrypted connection and processed in a private temporary folder on our server. The uploaded file and the result are deleted from the server as soon as processing finishes — whether it succeeds or fails — and the result is sent straight to your browser. If an upload is interrupted part-way, its temporary data is removed automatically within about 30 minutes. We do not keep copies.
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