offlinewebtools.com browser-local workbench
Add Audio to Video
Replace or add a new audio track to your video with volume control. Perfect for adding background music or voiceovers.
Files are processed locally in your browser using WebAssembly. This input is required.
Saved FFmpeg presets (stored locally)
Preview and export
Inspect the source before running FFmpeg, then preview the generated output before downloading.
Expected output
The generated file preview, size, type, and download action appear here after processing.
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.
1.0 = normal, 0.5 = half volume, 2.0 = double
What this tool does
Add Audio to Video helps you replace or add a new audio track to your video with volume control. Perfect for adding background music or voiceovers.
What you get
Add Audio to Video produces a direct output in this page and keeps all processing on your device, with nothing uploaded to our servers.
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.