About the Change Video Volume
Change Video Volume adjusts how loud the sound of a video is and saves a new file. Type a percentage: 100 keeps the sound as it is, 200 makes it twice as loud, 50 halves it and 0 turns it off. Only the sound track is processed. The picture is copied exactly as it is, so quality does not drop and the job is quick. Everything runs in your browser, so your video is never uploaded.
Updated October 2026
How to use the Change Video Volume
- 1Select a video that has sound.
- 2Tap a preset or type a volume in percent. 150 means one and a half times louder.
- 3Press Change volume.
- 4Play the preview to check the level.
- 5Download the video.
Percent, decibels and what you hear
The volume you type is a multiplier of the signal. 200% doubles it, which adds about 6 decibels. 50% halves it, taking away about 6 decibels. Hearing is not linear: to the ear, a sound sounds twice as loud after roughly 10 decibels, so 300% (about 9.5 decibels more) is close to twice as loud, and 50% is only a little quieter than you might expect.
Boosting quiet recordings
Phone videos filmed far from the speaker, or recorded with a low microphone level, are often too quiet. A boost to 200 or 300 percent usually fixes this. If the video has loud peaks and quiet speech, boosting can make the peaks distort before the speech is loud enough. In that case, accept a gentler boost, or fix the level of the audio track with the Audio Equalizer before putting it back.
- Interview or lecture recorded from far away: try 200 to 300%
- Video with loud music and soft speech: keep to 150%
- Final check: listen with headphones for crackling
Lowering loud videos
Sometimes the opposite is true: a clip jumps out when it follows a quieter one. Typing 50 to 70 brings it back to a comfortable level. If you plan to join clips, match their volumes first, then use Merge Videos so the finished video has an even sound level throughout. To measure how loud a track is, see the Audio Loudness Checker.
Why it is quick
Because only the sound track is changed and the picture is copied, even a long video finishes in a short time. The sound is re-encoded once, which is why it is saved in the same container as the original: an MP4 stays an MP4, and a WebM stays a WebM.
If you just need silence
To remove sound entirely, use Mute Video, which drops the track rather than turning it down to zero. On phones and computers, Chrome and Edge support the most audio formats, while Safari and Firefox handle the common AAC, MP3 and Opus sound found in most videos.
Features
- Volume from 0% to 400%
- Quick presets for 50, 150, 200 and 300 percent
- The picture is copied, not re-encoded
- Keeps the original format: MP4, MOV, WebM or MKV
- Fast, even for long videos
- Private: no upload
Frequently asked questions
How do I make a quiet video louder?
Type a volume above 100. Try 150 or 200 for a recording that is a little low. Listen to the preview, and if it sounds harsh, choose a smaller number.
Why does the sound crackle when I go very high?
Sound has a ceiling. Anything pushed past it is cut off, which is called clipping and sounds like crackling. If a video is already loud, a higher setting only adds distortion. Back off to a lower percentage.
Does it change the picture quality?
No. The picture track is copied without being decoded, so it stays exactly as recorded and the tool finishes quickly.
What does 100% do?
It keeps the sound at its current level. The sound is still re-encoded once, so use it only if you need a fresh copy.
Can I change the volume of only one part?
This tool changes the whole video. Cut the part out, change it, and join the pieces again with a video editor.
My video has no sound. Can this add some?
No. There is nothing to make louder. Use Add Audio to Video to give the video a sound track.
Is 400% really four times as loud?
It multiplies the signal by four, about 12 decibels more. People hear a 10 decibel increase as roughly twice as loud, so 400% sounds a bit more than twice as loud, if it does not clip.
Is my video uploaded?
No. It is processed by your browser on your own device.