Rescreen / Free tools / Increase video volume
Increase video volume
Make a quiet recording easy to hear, without distortion and without changing the picture.
Increase the volume of a file
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Drop a video or audio file here
or choose one from your device
MP4, MOV, WebM, MKV, M4A, MP3 or WAV, up to 2.0 GB.
- File
- Contains
- Length
Starting…
Drag the level up for louder, down for quieter. The arrow keys move it one decibel, Page Up and Page Down six.
How to increase video volume
From a quiet recording to one that is easy to hear, in your browser.
Choose a file
Choose or drop a video or audio file. The page measures how loud the sound is and draws it, then sets the level that brings speech to −16 LUFS.
Listen and adjust
Press Play and switch between Original and Louder. Drag the level up or down; the preview follows.
Make it louder and download
Press Make louder. The picture is copied as it is, the sound is turned up, and the new file is checked before you download it.
Make a video louder without distortion
A file can only hold sound up to a fixed peak. Turn a recording up past it and the loudest moments are cut flat, which is the crackle you hear on an over-loud video. So this page does two things. First it measures the loudness of the whole recording the way broadcasters do (ITU-R BS.1770, in LUFS, which ignores the silence between words) and works out the gain that brings speech to −16 LUFS, the usual level for speech online. Then a limiter after the gain watches a few milliseconds ahead and turns down only the moments that would pass−1.5 dB, smoothly, so a shout or a laugh stays clean while the rest is louder.
That is what normalizing audio means: setting a recording to a chosen loudness rather than just pushing its peaks to the top. The same gain applies all the way through, so a quiet aside stays quieter than the main point. Where the limiter will act, the waveform marks it, and the page tells you how far it held the loudest moment down once the file is done. It adds at most 36 dB.
When louder is not enough
Turning a recording up turns up everything in it. On a laptop recording that means the fan, the room and the keyboard come up with your voice, and they can be what you notice first in the louder file.
For steady noise such as a fan or hum, the free background noise remover works in your browser like this page. For more than that, upload the video to Rescreen: its noise removal is a neural model trained on speech, which takes the noise out from under the voice rather than only muting the quiet parts, and levels the result to the same −16 LUFS. On real recordings the room between words fell by 20 to 40 dB while the voice kept its level. Cleaning, editing, sharing by link and posting to YouTube are free. Downloading the cleaned video needs Pro, $10 / month, billed $120 yearly.
Frequently asked questions
More for a recording’s sound: remove background noise, remove the silent pauses and extract the audio.
How do I make a video louder?
Open the video on this page. It measures the sound and turns it up to −16 LUFS, the usual level for speech online, with a limiter so the loudest moments do not distort. Drag the level up or down if you like, compare Original and Louder, then press Make louder and download the file.
How do I boost the audio in a video, and by how much?
The page works out how much your recording needs and shows it on the level handle. It can add up to 36 dB, which is enough for a laptop microphone that recorded very quietly. A recording that needs more was usually made with the microphone barely on, and turning it up further mostly raises the hiss.
What does normalizing audio do?
It sets a recording to a chosen loudness rather than a chosen peak. This page measures loudness the way broadcasters do (ITU-R BS.1770, in LUFS) and levels the whole file to −16 LUFS, so a quiet recording is turned up and a very loud one turned down. The same gain applies all the way through, so quiet and loud parts keep their balance, and a limiter holds the peaks under −1.5 dB.
Will it make the background noise louder too?
Yes. Turning a recording up turns up everything in it: the fan and the room as well as your voice. To take the noise out, try the free background noise remover in your browser, or record your next video with Rescreen, whose AI model is trained on speech and takes the noise out while keeping your voice. Cleaning, editing, sharing by link and posting to YouTube are free. Downloading the cleaned video needs Pro, $10 / month, billed $120 yearly.
Does it change the picture?
No. The picture is copied into the new file exactly as it was. Only the sound is decoded, turned up and encoded again, and it is written sample for sample in step with the original, so lips stay in sync.
Which files work?
Videos in MP4, MOV, WebM or MKV, and sound files in M4A, MP3 or WAV, up to 2 GB and 3 hours. MP4, MOV and MKV come back as MP4, WebM stays WebM, sound-only files come back as M4A, and WAV stays WAV.
Is my video uploaded?
No. The file is read, turned up and checked inside this page. We count anonymous page views and whether a run started, finished or failed, never the file, its name or its sound.
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