Volume and normalize
Raise, lower or normalize the level
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What is Volume and normalize?
This tool fixes audio that sounds too quiet or too loud. You can raise or lower the volume by hand, or let it adjust automatically to a standard level.
The Normalize option matches the loudness used by podcasts and music platforms, and the Peak option raises everything as much as possible without the sound distorting. You see the waveform before and after.
How to use it
- Upload your audio.
- Choose the mode: Gain, Normalize or Peak.
- Adjust the decibels or choose −16 LUFS (speech) or −14 LUFS (music).
- Choose the output format and click Apply.
- Compare the waveform and download the result.
Advantages
- Manual gain from −20 to +20 dB with a clipping warning.
- EBU R128 loudness normalization to −16 or −14 LUFS.
- Peak normalization to −1 dBFS measured on the actual file.
- Visual before-and-after comparison of the waveform.
Technical details
Gain mode applies ffmpeg's volume filter in 0.5 dB steps and warns if the estimated peak would exceed 0 dBFS. Normalize uses loudnorm (EBU R128) with an integrated target of −16 or −14 LUFS, a true peak of −1.5 dBTP and a loudness range of 11 LU; since loudnorm works internally at 192 kHz, the output is resampled to 48 kHz. Peak mode first measures the true peak level with astats at the original sample rate and applies the gain needed to bring it to −1 dBFS. The result is encoded as MP3, WAV, OGG, Opus, M4A or FLAC. Accepts audio and video up to 300 MB.
Frequently asked questions
How do I boost the volume of an audio file that is too quiet?
Use Peak mode: it raises everything as far as possible up to −1 dB without distortion. If you need more, try Normalize to −16 LUFS.
What does normalizing audio mean?
Adjusting its volume to a reference level. Loudness normalization (LUFS) evens out how loud it is perceived; peak normalization targets the highest point of the signal.
What LUFS level should I use for a podcast?
−16 LUFS is the usual value for podcasts and speech. For music on streaming platforms −14 LUFS is commonly used.
Why does it distort when I turn up the volume?
Because the peaks go over the digital maximum and get clipped. The tool warns you when the chosen gain may clip.
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