Adjust the volume of an audio file with a simple browser-based tool.
WAV ยท MP4 ยท M4A ยท FLAC ยท OGG ยท max 200 MB
A volume booster raises the level of an audio signal so that a quiet recording can be heard more easily. It is particularly useful for voice notes, interviews and other recordings captured at a low level. Increasing gain, however, does not improve every aspect of audio quality. Background hiss, electrical hum and room noise may become louder alongside the wanted voice. The purpose is to achieve a practical listening level, not simply to produce the largest possible waveform.
Gain changes the signal's amplitude, while perceived loudness also depends on frequency content and recording dynamics. Two files with similar peak levels can sound very different in volume. If the original contains brief loud sounds, adding substantial gain can cause those peaks to clip even when most of the recording seems quiet. Start with a modest increase and listen carefully. Avoid judging only by the numerical gain setting; the important result is whether speech or music remains clear and comfortable.
A quiet microphone recording may become much easier to follow after a controlled volume increase. You might also prepare a personal listening copy of a lecture or an old recording that plays noticeably softer than your other files. For a file with widely varying volume, ordinary amplification may be insufficient because loud sections limit how far the whole signal can be raised. In that situation, normalisation or dynamic-range processing may be more appropriate, depending on the underlying problem.
Clipping occurs when the processed signal exceeds the available digital range. It can produce sharp, crackling or harsh sounds, especially around consonants, drums and other transient peaks. If you hear distortion, lower the gain and try again from the untouched original. Increasing the output bitrate or changing the filename will not correct clipping introduced during amplification. If the source itself was already distorted during recording, simply making it louder cannot undo that damage.
Select a supported source and keep a copy before making changes. Apply a moderate boost, wait for processing and download the result. Listen on ordinary headphones or speakers at a comfortable device-volume setting. Compare the quietest useful passages as well as the loudest peaks. The recording should become easier to hear without sounding aggressive or strained. When sharing with others, avoid an excessively loud export that forces listeners to reduce their playback volume immediately.