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Add audio to video

Put a song or voiceover under a video, replacing its sound or mixed with it. It’s free, with no watermark.

Files stay on your device

Drop the video

Then add a song or voiceover to play under it, replacing or mixed with its sound. A photo works too. Nothing is uploaded.

MP4, MOV, MKV, WebM, MPEG-TS, and 3GP videos.

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.

  1. Step 1

    Choose your video
    Pick the video that needs a new sound.

  2. Step 2

    Add the sound
    Add a song or recording, then replace or mix, loop, and set its volume.

  3. Step 3

    Download the video
    Save the video with its new sound.

What to expect

Supported inputs
A video this browser can read, or a photo, 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.

Your files stay on your device

Your computer does the work, so the file never has to be uploaded, and that’s also why it’s free: there’s no server time for us to pay for. You don’t need an account, and nothing you make gets a watermark.

“Helped me in a pinch! Love your passion!”
Erick, a supporter

Questions

Yes. The picture is copied into the new file exactly as it was; only the sound is encoded.

Choose Mix to play the new audio underneath it, and lower the song's volume so voices stay clear.

Turn on Loop to play it again from the start until the video ends. Otherwise the rest of the video is silent.

It stops at the end of the video, fading out over the last two seconds unless you turn the fade off.

Yes. Choose the photo where the video goes, then the song. You get an MP4 of the photo that lasts as long as the song, and you can pick its shape and background.

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