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Compress MP3, WAV, M4A, FLAC, OGG, Opus, and other browser-readable audio locally.
Reduce audio file size by changing the codec, bitrate, sample rate, or channel count. MP3 at 96 or 128 kbps is often a practical choice for spoken audio, while 192 kbps keeps more detail for music.
Bitrate usually has the largest effect on output size. Converting stereo speech to mono can reduce size further, and lower sample rates can help with voice recordings that do not need full music bandwidth.
The result panel reports the output size and percentage change. Very short files or already compressed sources can occasionally become larger when re-encoded with a higher bitrate.
This tool reduces file size by re-encoding the audio with a selected format, bitrate, sample rate, and channel count. It does not apply dynamic range compression to make loud and quiet passages more even.
Bitrate usually has the greatest effect. For speech, mono and a lower sample rate can reduce size further. Music normally benefits from stereo and a higher bitrate to preserve detail.
A source that already uses a low bitrate may grow when exported at a higher bitrate. Very short files also have container overhead, and converting from one compressed format to another cannot recover lost quality.
Related tools: Audio Converter · Audio Normalizer