Mix video audio in your browser
Add background music to a video or audio recording for free in your browser. Adjust voice and music levels, provide a separate vocal track and automatically lower music during speech, with no uploads or account.
How to use mix video audio
- Choose your recording, then add a music file or a separate vocal track.
- Adjust the audio levels and choose whether to lower music during speech.
- Export your recording with the mixed soundtrack as MP4 video or WAV audio.
Before you start
Music loops to cover the recording. Speech ducking uses the original audio or your separate vocal track during export; the preview uses caption timings when present. Set the original level to zero to replace its soundtrack. This tool does not separate vocals from an existing mixed track. Browser memory limits apply.
One recording up to 512 MB and 2 hours on desktop, or 192 MB and 1 hour on mobile. Short recordings work best; browser memory may impose lower limits. Editing prepares automatically after selection. Files and captions stay on your device; no account or payment is required. Read the privacy policy.
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