Audio compressor

Compress an audio file by choosing an output format and bitrate to reduce file size. The tool re-encodes media locally with FFmpeg/WASM without uploading the audio content to Bethemesh.

Choose MP3, M4A, OGG or Opus, then a bitrate from 32 to 320 kbps. FFmpeg/WASM re-encodes the track with the corresponding codec. A lower bitrate usually means a smaller file but also more audible loss; re-encoding an already compressed file can never restore information that was removed earlier. The initial setting is MP3 at 128 kbit/s. Compression here means reducing encoded data, not adjusting a dynamics compressor’s threshold, ratio or attack. The engine accepts 32–320 kbit/s and rounds decimal bitrate requests to an integer. Some codec and source sample-rate combinations may still be unsupported. Re-encoding an already small file can make it bigger. Compare actual bytes and listen to the result instead of assuming that a compression action always saves space. For Opus, processing uses the native CELT encoder at the requested bitrate. It avoids a libopus memory failure in the current core and does not offer SILK speech mode.