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First run downloads FFmpeg (~25 MB) once in this browser. Processing stays on your device — no server upload.

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Boost video volume online free

Increase volume of MP4 or make a video louder online. Lower or boost MP3 volume from 50–500%. Local-first. No signup.

What is a video volume booster?

A video volume booster raises the soundtrack inside an MP4 or other clip so the video sounds louder. The same tool can increase or lower MP3 volume. Processing runs locally in your browser with FFmpeg WebAssembly.

Boost volume features

Increase volume of MP4 and audio files online.

  • Increase volume of MP4

    Make an MP4 soundtrack louder while keeping the picture when possible.

  • Make a video louder

    Boost video volume on MOV and WebM as well as MP4.

  • Lower or boost MP3 volume

    Set gain from 50% to 500% (100% = original loudness).

  • Local-first

    Volume changes run locally with FFmpeg WebAssembly for privacy.

  • Simple download

    Download the adjusted file as soon as processing finishes.

How to increase volume for video or audio

Boost volume online in three steps.

  1. Upload media

    Drop an MP4, MOV, WebM, MP3, M4A, or WAV file (up to 200 MB).

  2. Set volume gain

    Choose a gain percent — try 150–250% for quiet recordings.

  3. Boost and download

    Click Boost volume, then download the result.

Great for

Common volume booster and volume increaser scenarios.

  • Quiet phone videos

    Increase volume of video clips recorded too softly.

  • Podcast and voice notes

    Make audio louder before sharing or publishing.

  • Presentation clips

    Boost soundtrack so embedded videos are easier to hear.

  • Quick loudness fixes

    Raise volume without opening a full desktop editor.

Frequently Asked Questions

Quick answers about this tool—open a question to read more.