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Volume Booster and Normalizer
Make quiet audio or video louder, or even out loudness to a standard level (EBU R128).
Free, no uploads, no sign-up. Runs 100% in your browser.
How Volume Booster and Normalizer works
The sound is processed by ffmpeg compiled to WebAssembly, running in your browser. The engine (about 30 MB) downloads the first time and is cached after that, so nothing is ever uploaded. Boost uses a gain plus a limiter so peaks do not clip. Loudness mode uses the loudnorm filter (EBU R128).
Input: MP3, WAV, M4A, OGG, FLAC, AAC, MP4, MOV, WEBM, MKV. Output: MP3, WAV, M4A, OGG, FLAC, MP4, MOV, WEBM.
How to use Volume Booster and Normalizer
- Drop an audio or video file.
- Choose Boost, Loudness or Even out.
- Apply, listen and download.
Tips
- For podcasts aim for -16 LUFS, for music streaming -14 LUFS.
Volume Booster and Normalizer FAQ
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
Related tools
- Noise Reduction: Remove hiss, fan noise, hum and rumble from voice recordings and video sound.
- Equalizer and Bass Boost: 10-band equalizer with bass boost, vocal and treble presets and a live preview.
- Audio Editor & Trimmer: Trim, fade in/out, change volume and export with a waveform.
- Audio Converter: Convert MP3, WAV, OGG, AAC, FLAC and M4A.