Is the video re-encoded too?

No. Only the audio is processed; the video stream is copied without re-encoding. This keeps the operation fast and preserves video quality exactly.

Is my video uploaded to a server?

No. ffmpeg.wasm runs in your browser via WebAssembly. The file never leaves your device.

Does it work on mobile?

Yes. Works on iPhone Safari and Android Chrome without installing any app.

Will boosting the volume cause clipping?

Yes, if the resulting audio level exceeds 0 dBFS (the digital ceiling). A 2× boost on audio that is already near maximum will distort. Start with 2× and listen to the result before going higher.

Boost Video Volume

Amplify the audio of a quiet video by up to 10× without changing the picture.

100% client-side · no upload

Video file (MP4, WebM, MOV…)

Settings Volume multiplier (1 = original, 2 = double)

Load a file to begin.

How to use

Choose your video file. MP4 and WebM are best supported.
Set the volume multiplier. 2 = double volume, 0.5 = half volume. Values above 1 boost; below 1 reduce.
Click Boost volume. Only the audio is re-processed; video is copied unchanged. Download the louder video.

Related tools

More ways to use this tool

Frequently Asked Questions

Is the video re-encoded too?: No. Only the audio is processed; the video stream is copied without re-encoding. This keeps the operation fast and preserves video quality exactly.
Is my video uploaded to a server?: No. ffmpeg.wasm runs in your browser via WebAssembly. The file never leaves your device.
Does it work on mobile?: Yes. Works on iPhone Safari and Android Chrome without installing any app.
Will boosting the volume cause clipping?: Yes, if the resulting audio level exceeds 0 dBFS (the digital ceiling). A 2× boost on audio that is already near maximum will distort. Start with 2× and listen to the result before going higher.

Last updated: 2026-05-20 By jarvisbox