Can I keep the original audio and just add music on top, instead of replacing it?

Yes, you can choose to mix the new audio with the existing track instead of replacing it entirely.

What happens if the new audio is longer or shorter than the video?

The audio is aligned to the video's start — if it's shorter, the video continues with silence (or original audio, if mixing) after the new track ends; if longer, the extra audio is simply not heard once the video ends.

Does this affect video quality?

No, only the audio track is changed — the video itself is untouched.

Does Add/Replace Video Audio upload my files to a server?

No. Add/Replace Video Audio runs entirely in your browser using on-device processing, your files never leave your device.

Add/Replace Video Audio

Add a new audio track to a video, replacing or mixing with the existing audio.

Runs in your browser

Drop a video here

Choose File

About this tool

Replacing a video's shaky on-location audio with a cleaner studio recording, or adding a music track to silent footage, means combining a separate audio file with existing video — swapping out or mixing in new sound without touching the visual content. This tool adds a new audio track to a video, either replacing the existing audio entirely or mixing it in alongside what's already there.

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