Video volume booster

Make a video louder in three steps

1. Choose an MP4, MOV, or WEBM video, or press Try video sample.
2. Leave the default Match loudness mode on, or pick Gain to add a fixed number of decibels.
3. Press Boost volume, play the preview, and download the video with louder audio.

Why video recordings are quiet

A phone microphone is a long way from the speaker in a lecture hall, a meeting, or a street interview. The result is a soundtrack that sits far below the level of other videos, so viewers must turn the volume up and then get blasted by the next clip. Boosting the audio before you upload it fixes the problem at the source.

Match loudness, the default for video

In Match loudness mode the tool measures the average level of the soundtrack and raises it to a speech-friendly target of around −16 dB RMS. Peaks are softly limited, so a cough or a clap does not distort. If your video is already loud in places, the tool applies less boost, which is what you want. Gain mode is better when you know the exact amount you need.

Sync and quality

The audio is boosted over the full length and put back at the same timing, so lip sync is unchanged. The video frames are copied rather than redrawn where the browser allows. The soundtrack is re-encoded, so keep your original file. Very long videos need plenty of memory, because the soundtrack is decoded into uncompressed audio during editing; try a shorter section first on a phone.