Make a quiet video louder in seconds

Choose a video, pick how much louder, and download it. Only the sound changes; the picture is copied as it is.

Free, no sign upNo quality loss on the pictureNothing is uploadedStops clipping

VideoDrop it here or choose a file · MP4, MOV or WEBM

Make it louder by

How it works

Step 1
Choose a video
Drop it on the tool or pick a file, up to 250 MB and 10 minutes.
Step 2
Pick how much louder
+3 dB is a little, +6 dB doubles the signal level, +10 dB is a lot. Even out raises quiet parts and tames loud ones.
Step 3
Download
The sound is processed on your device; the video track is copied without re encoding, so it looks exactly the same.

How much is +3, +6 and +10 dB?

Decibels are logarithmic: every 20 dB multiplies the signal level by ten, so +6 dB roughly doubles it. The fixed settings pass through a limiter so peaks cannot clip into distortion.

Setting	Signal level	Use it when
+3 dB	About 1.4 times	It is slightly too quiet
+6 dB	About 2 times	It is clearly too quiet
+10 dB	About 3.2 times	It is very quiet, such as a phone across a room
Even out	Normalised to −16 LUFS	Some parts are quiet and others loud

What louder cannot fix

Raising the volume raises everything in the recording, including background noise and hum. If the voice itself is unclear, louder will not make it clearer; re recording, or a clean voice, will.

Platform facts checked on 17 September 2026 against each platform's own help pages.

Use it from an AI assistant or a script

Every setting is a URL parameter, so an assistant can send a link with the options already chosen. The tool still runs on the person's own device.

Parameter	Values	Default	Meaning
`gain`	`3, 6, 10, normalize`	`6`	Make it louder by

Make it twice as loud

https://percify.io/tool/increase-volume-of-video?gain=6

ffmpeg -i input.mp4 -map "0:v?" -map 0:a -c:v copy -af "volume=6dB,alimiter=limit=0.97" -c:a aac -b:a 192k -movflags +faststart output.mp4

Even out quiet and loud parts

https://percify.io/tool/increase-volume-of-video?gain=normalize

ffmpeg -i input.mp4 -map "0:v?" -map 0:a -c:v copy -af loudnorm=I=-16:TP=-1.5:LRA=11 -c:a aac -b:a 192k -movflags +faststart output.mp4

Every free tool and its parameters, as JSON: percify.io/tools.json

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Frequently asked questions

Everything you need to know before you start.

Choose the video, pick +3, +6 or +10 dB, or Even out, and download. It runs in your browser, and the picture is copied untouched, so only the sound changes.

The picture is not re encoded, so it stays exactly the same. The sound is re encoded as AAC at 192 kbps, and a limiter stops the louder audio from clipping.

About twice the signal level. Every 20 dB is a factor of ten, so +3 dB is about 1.4 times, +6 dB about 2 times and +10 dB about 3.2 times.

The video has no audio stream to change, which happens with some screen recordings and exported clips. Add audio in an editor first.

No. It is processed on your device with FFmpeg running in WebAssembly.