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Change the volume of a video

Choose a video, set its volume, preview the change, then export.

How it works

ImportChoose source
EditSet the change
PreviewReview result
ExportCreate file

InputMP4, WebM, MOV and M4V videoOutputMP4 or WebM video

MP4 · WebM · MOV · M4VChoose a videoIts volume is measured automatically.

Sometimes the soundtrack simply needs to be louder or quieter — a recording made too far from the microphone, a clip that blasts compared with everything else in a sequence, a section that should sit back under narration. This tool sets the level in decibels, previews the change, and can automate volume so it varies across the video.

Reading decibels

Volume is set in dB, and the scale is logarithmic rather than linear. Roughly speaking, +6 dB doubles the amplitude, −6 dB halves it, and around +10 dB is what most people perceive as twice as loud. Small numbers matter more than they look: 1 or 2 dB is a fine adjustment, 3 dB is clearly audible, and 12 dB is a drastic change. If you find yourself needing more than about 15 dB of boost, the recording is probably too quiet to rescue this way, and raising it that far will bring the noise floor up with it.

Boosting has a ceiling

Digital audio has a hard maximum, and pushing signal past it does not get louder — it clips, which sounds like harsh crackling on the loudest words. Leave a few decibels of headroom below the maximum rather than aiming at it. When quiet parts need lifting but loud parts are already near the top, a straight volume increase cannot deliver both: that is what a compressor is for, since it reduces the distance between loud and quiet before you raise the whole thing. A limiter is the safety net that catches whatever still pokes through.

Questions, answered

How many dB should I add to a quiet recording?

Start with 6 dB and listen. Beyond about 15 dB you are amplifying the noise floor as much as the voice, and compression before boosting gives a better result.

Why does my audio crackle after I raise the volume?

It is clipping — signal pushed past the digital maximum. Reduce the boost and leave a few dB of headroom, or use a limiter to catch the peaks.

What does +10 dB actually sound like?

Roughly twice as loud to most listeners. +6 dB doubles the amplitude but is perceived as noticeably rather than twice as loud, and 1–2 dB is a subtle trim.

Can I change volume for only part of the video?

Yes. Volume can be automated across the clip, so one section can sit lower under narration while the rest stays at full level.

Should I use this or normalising?

This when you know the change you want, or need it to vary over time. Normalising when you want the whole clip measured and matched to a standard target automatically.

Change the volume of a video

Reading decibels

Boosting has a ceiling

Questions, answered

Useful next steps