Make a video louder.
Boost a quiet video by up to 15 dB without the crackle. The picture is copied untouched, on your device.
How do I increase the volume of a video for free?
Pick how much louder you want it (+3, +6, +10 or +15 dB) and drop the video into Cutmallow's free volume booster above. The sound is decoded, raised, passed through a soft limiter so the loudest moments never crackle, and encoded again; the picture is copied without re-encoding, so it stays identical. The file keeps its format. It all runs in your browser, with no upload and no watermark.
Updated
- Boost
- Up to +15 dB
- Crackle
- Limited
- Picture
- Untouched
- Size limit
- None
How to use it
Pick how much louder: +6 dB suits most quiet phone videos.
Drop a video, or tap to pick one.
Save the louder video. On a phone, the share sheet offers Save Video.
How it works
Volume is a multiplication: every sound sample is multiplied by a gain. +6 dB doubles the signal, +10 dB triples it, +15 dB multiplies it by more than five. The catch is that a digital recording cannot go past full scale, so simply multiplying a video that already has loud moments makes those moments clip, the harsh crackle of a boosted phone video.
So after the gain, every sample goes through a soft limiter. Quiet and normal sound passes unchanged; anything above about 70% of full scale is bent down along a smooth curve that approaches, but never reaches, a ceiling just under full scale, with room left for the small overshoot that audio encoding adds. Speech gets clearly louder while shouts, claps and music peaks are tamed instead of distorted.
Only the sound is processed. The video packets are copied into the new file exactly as they were, which is why the picture cannot change and why it is fast. It runs on Mediabunny, an open-source media library, in a background thread of the page. Your video never leaves your device.
Tips for a better result
- Start with +6 dB. Go to +10 or +15 only for voices recorded far from the phone.
- Boosting also raises background hum. Clean it first with the background noise remover.
- Volume set to maximum and still quiet? The recording itself is quiet: boost it here.
Turn it into a Short
Cutmallow's free editor finishes the job. After boosting, tap Edit in Cutmallow and your video opens there, still on your device.
- Cuts the pauses and filler words
- Writes animated word-by-word captions
- Exports a 9:16 MP4 for Shorts, Reels and TikTok
Frequently asked questions
Something else? Write to hello@cutmallow.com.
How do I make a video louder on iPhone?
Open this page in Safari on iOS 26 or later, pick +6 dB, tap the drop box and choose the video from Photos. Tap Save video when it is ready: the share sheet offers Save Video, which puts the louder copy in Photos next to the original.
Will boosting the volume distort the sound?
Not by clipping: a soft limiter bends the loudest peaks down so the sound never goes past full scale. At +15 dB on a recording that is already loud, music and shouting can sound squashed; pick a smaller boost if that happens.
Does it change the video quality?
No. The picture is copied exactly, frame for frame. Only the sound is decoded and encoded again, at 192 kbps.
How much is 6 dB or 10 dB?
+6 dB doubles the strength of the signal, which most people hear as about one and a half times as loud. +10 dB is heard as roughly twice as loud. +3 dB is a small, gentle lift.
Is my video uploaded anywhere?
No. Your video never leaves your device. The file is opened and processed by your own browser, and the result is saved straight from your device.
Is there a file size or length limit?
No. The file is read from your device a piece at a time and the result is written to the browser’s private storage, so long and very large videos work. The only limit is free space on your device.