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ProCutOutHappy Diwali

Free Online MP3 Compressor

Compress and reduce MP3 audio file size online.

or drag and drop your audio here

MP3, WAV, M4A, or OGG, up to ~100MB

No audio? Try a sample:

Acoustic Melody (1.6 MB)
Voice Memo (380 KB)

How to use

  1. 1Drag and drop your MP3 (or WAV, M4A, OGG, AAC, FLAC) audio file into the compressor, or choose one of our built-in sample tracks.
  2. 2Select a compression preset such as 'Voice / Speech' (64 kbps), 'Podcast / Mobile' (96 kbps), or 'Standard' (128 kbps), or open custom settings to choose your exact bitrate and mono downmixing.
  3. 3Review the estimated compressed file size and percentage savings displayed in real time.
  4. 4Click 'Compress MP3' to process your audio locally in seconds, then click 'Download Compressed MP3' to save your optimized file.

Privacy: ProCutOut MP3 Compressor processes all audio files strictly inside your browser using client-side Web Audio API and WebAssembly/JavaScript encoding algorithms. Your audio files, voice recordings, and personal memos are never uploaded to any remote server or stored in the cloud.

Want the details? Audio bitrate explained: what 32 to 320 kbps really do to file size and the frequencies you keep