Can I use this on video files?

Yes, this tool adjusts the audio track of any video file. The video stream is preserved; only the audio volume changes.

What does the normalize option do?

Normalizing automatically raises or lowers the overall level so the peak or loudness hits a target without clipping. It is the safest way to make a quiet recording louder, since it scales the whole file rather than guessing a manual dB boost.

What is LUFS and what should I target?

LUFS measures perceived loudness. Streaming platforms normalize to around −14 LUFS (Spotify, YouTube), so mastering near that level avoids the platform turning your audio up or down. Spoken-word podcasts often aim for about −16 LUFS.

How many decibels doubles the loudness?

Roughly +10 dB doubles perceived loudness, while +6 dB doubles the signal amplitude and sounds clearly louder. Because hearing is logarithmic, small dB changes are subtle, which is why audio levels are specified in dB rather than percentages.

Will boosting volume cause distortion?

It can. Pushing levels past 0 dBFS clips the waveform and adds harsh distortion. Use the normalize option, which raises the level only as far as the available headroom allows, to get maximum loudness without clipping.

Can I lower background music under a voiceover?

Yes. Reduce the music file by around −18 to −20 dB so narration sits clearly on top, a technique called ducking. Adjust the music clip first, then merge it with your voice track.

Does it work on both audio and video files?

Yes. It adjusts the audio level of standalone audio (MP3, WAV) and of video files (MP4, WebM, MOV) alike, processing everything locally in your browser so the media is never uploaded.

Change Audio Volume Online — Increase or Decrease

How to use Change Audio/Video Volume

The Change Volume tool lets you amplify or reduce the audio level of an MP4, WebM, MOV, MP3 or WAV file by a precise decibel amount or a percentage multiplier — processed entirely in your browser with no file uploads. Use it to boost a quiet recording, normalize clipped audio, balance the loudness of clips before merging, or duck music under a voiceover.

Click "Select File" and open your video or audio file.
Choose the adjustment method: decibel change (e.g. +6 dB or −10 dB) or percentage multiplier (e.g. 150%).
Enable "Normalize" to automatically set the peak level to the target loudness without clipping.
Preview the adjusted audio using the built-in player to confirm the level is correct.
Click Apply and download the volume-adjusted file.

Your data never leaves your device — 100% private processing.

Decibels vs percentage volume adjustment

Decibels (dB) are the standard unit for audio level changes because human hearing is logarithmic. A +6 dB boost approximately doubles the perceived loudness; −6 dB halves it. Percentage adjustment is linear and more intuitive for non-technical users: 200% doubles the amplitude, 50% halves it. Both modes apply the same underlying gain operation; dB is preferred for broadcast and professional work because most metering, standards and specifications (EBU R128, ATSC A/85) are defined in dB.

Common volume adjustments
Adjustment	Effect on loudness
+6 dB	Approximately doubles perceived loudness
+3 dB	Noticeable increase, about 40% louder
0 dB	No change
−6 dB	Approximately halves perceived loudness
−20 dB	Significantly quieter, good for background music

Normalisation and loudness standards

Normalization sets the peak or integrated loudness of an audio file to a target level. Peak normalization ensures no sample exceeds 0 dBFS (the digital ceiling) to prevent clipping. Loudness normalization targets an integrated loudness value measured in LUFS (Loudness Units relative to Full Scale) — streaming platforms like Spotify target −14 LUFS, YouTube targets −14 LUFS and broadcast standards vary between −23 and −24 LUFS. Use loudness normalization when preparing content for a specific platform to avoid the platform silently adjusting your levels.

Glossary

Decibel (dB): A logarithmic unit for measuring sound level or signal amplitude; a +6 dB increase roughly doubles perceived loudness.
dBFS: Decibels relative to Full Scale; 0 dBFS is the maximum digital level; values above 0 dBFS cause clipping distortion.
LUFS: Loudness Units relative to Full Scale; an integrated loudness measurement standard used by streaming platforms and broadcast specifications.
Clipping: Distortion caused when an audio signal exceeds the maximum digital level (0 dBFS), producing a harsh, crackling sound.
Gain: A multiplier applied to an audio signal that increases or decreases its amplitude; a gain of 2× is approximately +6 dB.

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Change Audio/Video Volume

How to use Change Audio/Video Volume

Decibels vs percentage volume adjustment

Normalisation and loudness standards

Glossary

Related reading

Frequently Asked Questions

Why use Change Audio/Video Volume?

Common use cases

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