offlinewebtools.com — free, watermark-free browser tools that stay on your device with nothing uploading to our servers

Add Audio to Video

Replace or add a new audio track to your video with volume control. Perfect for adding background music or voiceovers.

Free to use, no watermarks, runs in your browser—nothing uploads to our servers

Source file

Files are processed locally in your browser using WebAssembly.

Note: This tool requires uploading both a video and audio file. Current implementation is limited to single file input. Use desktop video editing software for adding audio tracks.

Audio Volume

1.0 = normal, 0.5 = half volume, 2.0 = double

Report a bug

If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.