Audio ToolsFree

MP3 Compressor

Reduce MP3 file size by re-encoding at a lower bitrate. Convert high-bitrate audio to smaller files for web streaming, apps, email attachments, or storage without significant quality loss. In-browser with FFmpeg.wasm — no upload, no signup.

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MP3, WAV, OGG, FLAC, AAC · Any format

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Frequently Asked Questions

What bitrates are available for compression?▼
32, 64, 96, 128, 192, 256, and 320 kbps. For voice recordings 64-96kbps is fine. For music, 128-192kbps provides a good quality-to-size balance.
What is a good bitrate for web audio?▼
128 kbps is excellent for speech and podcasts. 192 kbps is ideal for music streaming. 320 kbps is CD quality for archival.
How much can I reduce the file size?▼
A 320kbps MP3 compressed to 128kbps is approximately 60% smaller with only a slight quality reduction that most listeners cannot detect.
Is the compression done in the browser?▼
Yes. FFmpeg.wasm handles re-encoding locally. Your audio file is never uploaded to any server.
What formats can be compressed?▼
MP3 and other audio formats. The output is always MP3.