Private browser tool

Audio Volume Normalizer

Create a more consistent listening level using loudness normalization without uploading the recording.

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.

Reduce the difference between unusually quiet and loud recordings.

Prepare interviews, notes, and spoken content for easier listening.

All analysis and encoding occurs locally.

Common questions

How local browser processing works and what to expect.

What is loudness normalization?

It adjusts perceived level toward a target rather than simply multiplying every sample.

Will it remove background noise?

No. Normalization changes loudness and can also make existing noise more noticeable.

Keep working

Convert stereo audio to a single mono channel locally.

Resample audio to 16, 22.05, 44.1, or 48 kHz locally.

Convert audio to MP3 at 64, 96, 128, 192, or 256 kbps locally.

Need the words too?

Voysum can transcribe the converted recording and create subtitle files.