Choose a bitrate
Balance file size and sound quality with simple presets.
VoysumPrivate 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.
Works on your device
The source recording never leaves the browser.
Convenient MP3 output
Download a broadly compatible compressed file.
Common questions
Audio Compressor FAQ
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
Related free tools
Free browser tool
Change Audio Bitrate
Convert audio to MP3 at 64, 96, 128, 192, or 256 kbps locally.
Open tool →Free browser toolAudio Volume Normalizer
Normalize perceived audio loudness locally in your browser.
Open tool →Free browser toolAudio Cutter
Trim audio locally in your browser and download only the section you need.
Open tool →Turn this recording into searchable text.
Download the result, then upload it to Voysum for an editable transcript plus TXT, SRT, VTT, and CSV exports.
Continue to audio transcription