Private browser tool

Audio Compressor

Reduce an audio file for sharing, storage, or transcription with selectable MP3 bitrate.

No uploadNo accountFree to use

✓ Runs locally in your browser

↥Choose or drop a fileaudio/*, .mp3, .wav, .m4a, .webm · up to 500 MB

🔒 Your media file is never uploaded to Voysum.

Private by default

Useful conversion without giving up your file.

Balance file size and sound quality with simple presets.

The source recording never leaves the browser.

Download a broadly compatible compressed file.

Common questions

How local browser processing works and what to expect.

What bitrate should I choose?

128 kbps is a good general default; speech can often use 64 or 96 kbps.

Does compression remove quality?

Lower bitrates use more lossy compression and may reduce audible detail.

Keep working

Compress MP4 video locally without uploading it.

Speed up or slow down audio locally in your browser.

Change MP4 video speed locally in your browser.

Need the words too?

Voysum can transcribe the converted recording and create subtitle files.