uDocumentViewer
Compress.mp3 · .wav · .m4a · .aac

Compress audio in your browser

100% localFiles never leave your device — no upload, no account, no tracking.
About Compress Audio

Reduce the size of audio files by re-encoding them to MP3 at a bitrate you choose. Drop in an MP3, WAV, M4A, AAC, OGG, or FLAC and pick a target bitrate to balance size against quality, all powered by ffmpeg.wasm.

The transcode runs entirely in your browser. Your recordings and tracks never leave your device, so podcasts and voice memos stay private.

How it works
  1. 01

    Add an audio file

    Drop your audio file onto the page or pick it from your device.

  2. 02

    Set bitrate

    Choose a target bitrate to control the output size.

  3. 03

    Compress

    Click Compress to re-encode the audio locally with ffmpeg.wasm.

  4. 04

    Download

    Save the smaller MP3.

Features
adjustable bitratesmaller fileswide format support
Frequently asked
How does the Compress Audio compressor work?
Reduce the size of audio files by re-encoding them to MP3 at a bitrate you choose. Drop in an MP3, WAV, M4A, AAC, OGG, or FLAC and pick a target bitrate to balance size against quality, all powered by ffmpeg.wasm.
Are my files uploaded to a server?
No. Everything runs entirely in your browser using local JavaScript and WebAssembly. Your files never leave your device.
Does it cost anything or require an account?
No. The compressor is free, needs no sign-up, and runs locally in your browser.
Related compressors
Convert these files instead
Open these files in a viewer