Volume Adjust raises the level of a quiet video or recording, brings a loud one down, and can remove a video's sound entirely in one click. It is the “Volume” tab of the audio/video workbench and has three modes: “Decibel dB” (-30 to +30, step 0.5, +3 by default), “Percentage” (0%–400%, 150% by default) and “Mute (remove track)”, which appears for video only.

When a video is processed the picture is not re-encoded (-c:v copy) and only the audio is encoded again, so it is fast and loses no picture quality. The output container follows the source and the audio codec follows the container: AAC 192 kbps for MP4 / MOV / MKV, Opus for WebM, MP3 for AVI. Audio-only files are re-encoded in their own format (WMA, AMR and similar become MP3).

1. 01Add a file and select it— video or audio; switch to the “Volume” tab.
2. 02Pick a mode and a value— the “Decibel dB” slider runs from -30 to +30 and +6 dB is roughly twice as loud; “Percentage” runs from 0% to 400% and 200% is also about twice as loud. Video files get “Mute (remove track)” as well.
3. 03Check the estimated command— the dB mode builds volume=3.0dB, the percentage mode volume=1.50, and mute is -c:v copy -an.
4. 04Adjust and download— click “Adjust volume” (or “Remove track” in mute mode) and download <original-name>_volume.mp4 or <original-name>_muted.mp4.

One overall gain

— the same factor applies to the whole file; you cannot adjust one section only, and a level that drifts up and down is not evened out automatically (that is what “Loudness normalization” is for).

Clipping risk

— gain that pushes peaks past 0 dBFS distorts; check the source level and loudness in “Media info” first and start from +3 to +6 dB.

Audio is always re-encoded

— even a 1 dB lift encodes the audio again (AAC 192 kbps and similar inside video containers), except for lossless audio (FLAC, WAV).

Files without a track

— when no audio stream is found, the button is disabled and the page says “This file has no audio track”.

What it does not do

— no LUFS-standard normalization (use “Loudness normalization”), no fading (use “Fade in/out”) and no per-channel adjustment (use “Channel processing”).

Files are processed locally in the browser by ffmpeg.wasm and are never uploaded. On first use the engine, about 31 MB, is downloaded from a CDN (the site asset domain or jsDelivr); that request contains neither your audio nor your video.