Can I keep the video's original sound?
Yes. Mix mode retains the original sound and lets you control both track volumes.
Merge Video and Audio Online
Add music, narration, or another audio track to a video, with replace and mix controls.
Settings
Private by default. Browser processing never uploads your files. Server mode always asks first and deletes temporary files after 24 hours.
Related free video tools
Continue preparing your video without uploading it.
Audio Extractor
Turn a video's soundtrack into MP3, M4A, or WAV without sending the file anywhere.
Open toolVideo Cutter & Trimmer
Choose exact start and end times and create a clean video clip in your browser.
Open toolVideo Compressor
Compress a video in your browser with practical quality presets. Your file stays on your device.
Open toolExplore complete editing workflows
See how this utility fits into a larger publishing workflow.
What happens when the audio is shorter?
You can loop it to the video duration or let Reeloft pad the remainder with silence.
Need captions, smart cuts, or a complete edit?
Open Reeloft's AI video editor to turn raw footage into an editable project.
Try the AI video editor