Compress Audio
Reduce the size of any audio file by re-encoding it to MP3 at the bitrate you choose — perfect for email limits and uploads. Runs locally in your browser.
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How audio compression works
Lowering the bitrate tells the MP3 encoder to use fewer bits per second of audio. Fewer bits mean a smaller file, at the cost of some high-frequency detail.
Which bitrate should I pick?
For music, 192 kbps is near-transparent and 128 kbps is a solid balance. For speech and podcasts, 96 or 64 kbps cuts the size sharply while staying clear.
Privacy
Compression happens entirely on your device with ffmpeg.wasm. Your audio is never uploaded to a server.
How to compress audio
- Drop an audio file into the zone above.
- Choose a target bitrate — lower means a smaller file.
- Press Compress audio, then download the smaller MP3.