Add audio to video
Put a song or voiceover under a video, replacing its sound or mixed with it. Processing stays on your device.
Drop the video
Then add a song or voiceover to play under it, replacing or mixed with its sound. Nothing is uploaded.
Any media file this browser’s engine can read.
How to add audio to a video
Open a video, add an MP3, M4A, WAV, or any other sound, and choose whether it replaces the original audio or plays underneath it. Loop a short song, start it partway in, and fade it out at the end. The picture is copied without re-encoding, and nothing is uploaded.
Step 1
Choose your videoPick the video that needs a new sound.Step 2
Add the soundAdd a song or recording, then replace or mix, loop, and set its volume.Step 3
Download the videoSave the video with its new sound.
What to expect
- Supported inputs
- A video this browser can read, and a sound: an audio file, or another video whose sound you want.
- What happens
- The video keeps its picture and length, in its own format. The new sound is cut at the video's end, with a short fade, or looped to fill it. Mixed with the original, the video's own sound stays at full volume.
- Limits
- Mixing needs a browser that can decode the video's own sound. The picture isn't changed; use Trim video first to shorten it.
Private by design
Your video stays on your device
Mastershot processes your file locally in this browser. It does not need to be uploaded to a server, and you do not need an account to use the tool.
- No upload
- No signup
- No watermark