Audio Volume Changer

Boost a quiet voice memo, lecture recording or phone call so it can be heard on a laptop speaker; lower a loud music track so it sits under a voice-over; match the level of a ringtone or alarm; or reduce a file that distorts on a small speaker. For several files that should play at the same level, normalize them instead.

Volume changes are measured in decibels (dB). Positive values make sound louder, negative values quieter. Our ears hear about +10 dB as roughly twice as loud, while +6 dB doubles the signal level.

Digital audio has a hard ceiling, called 0 dBFS. If a boost pushes the loudest moments above it, they are flattened — clipped — and you hear crackling or harsh distortion. The tool shows your file's current peak, so a recording peaking at −8 dBFS can take about 8 dB of boost cleanly. Beyond that, the soft limiter bends the highest peaks smoothly under the ceiling instead of clipping them. It works well for speech and moderate boosts; for very large boosts of music, consider the Audio Normalizer, which sets a target loudness.

Use the Volume Changer when you know how much louder or quieter you want a file. Use the Audio Normalizer to bring a file to a standard loudness, such as −14 LUFS for streaming or −16 LUFS for podcasts, so several files play at the same level without adjusting each one. Both measure the file first and both protect against distortion.

Any audio the browser can decode can be opened — MP3, WAV, M4A, AAC, OGG, Opus, FLAC and the sound of videos. The result is saved as MP3, M4A (AAC), OGG (Opus) or WAV; the same format as the original is chosen by default. Lossy formats are re-encoded at the bitrate you choose, so pick a high bitrate to keep quality, or WAV for no further loss. Your file is processed entirely on your device.