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Compress audio

Make an MP3, M4A, WAV, or other audio file smaller by choosing a quality, or a size in MB for it to fit under. It’s a free audio compressor, and your file is never uploaded.

Files stay on your device

Drop an audio file to compress it

Make an MP3, M4A, WAV, or any recording smaller, by a quality step or to fit a size in MB.

MP3, M4A, WAV, FLAC, and other audio, or a video with sound.

How to compress an audio file

Open a song, voice recording, podcast, or any MP3, M4A, or WAV. Choose Balanced or Smallest to see about how big the file will be, or choose Size in MB to fit an email, upload form, or app limit, and the sound gets the best quality that fits. An MP3 stays an MP3 and an M4A stays an M4A, while a WAV can stay a WAV or become an MP3 about a tenth of the size. The audio compressor runs in your browser, on your phone or computer, with nothing to install.

  1. Step 1

    Choose the audio
    An MP3, M4A, WAV, or other sound file, or a video.

  2. Step 2

    Choose how small
    Balanced or Smallest, or a size in MB for it to fit under.

  3. Step 3

    Download it
    The smaller file, with its size next to the original’s.

What to expect

Supported inputs
MP3, M4A, WAV, FLAC, Ogg, Opus, AAC, AIFF, and other audio this browser’s engine can read, and videos with sound.
What happens
The sound is encoded again at a lower bitrate: 128, 96, or 64 kb/s for an MP3, and no lower than 80 kb/s for an M4A. A WAV stays a 16-bit WAV at a lower sample rate or in mono, or is saved as an MP3. A FLAC, AIFF, or video’s sound is saved as an MP3. With a size limit, the finished file is checked against it.
Limits
The lowest MP3 bitrate is 32 kb/s, about 14 MB an hour, so a long recording may need cutting to fit a small limit. Only the main sound track is kept.

For one format, size, or task

The same tool, with the settings already picked.

Also

Private by design

Your video stays on your device

Mastershot processes your file locally in this browser. It does not need to be uploaded to a server, and you do not need an account to use the tool.

  • No upload
  • No signup
  • No watermark

Questions

Open it here and choose Balanced or Smallest, or choose Size in MB and type the limit, such as 8 or 15. Select Compress and download the smaller file.

Yes, a little, since fewer bits keep less detail. Balanced (96 kb/s for an MP3) suits most music and speech, and Smallest suits voice recordings and podcasts.

No. It makes the file smaller. A compressor in music software evens out loud and quiet parts, which this doesn’t do. To make quiet audio louder, use the audio volume booster.

Yes. It stays an M4A at a lower bitrate, down to 80 kb/s, or choose MP3 to go smaller. A voice memo from an iPhone is often small already, so choose Size in MB for it.

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