Add audio or music to a video online
Add audio or music to a video online for free, right in your browser. No uploads and no sign-up — your files never leave your device.
Drop files here or choose them
You can also paste files with Ctrl+V
Files never leave your device
Put music or a voice-over on an MP4, MOV or WebM video: replace its sound or mix the track in, set the volume of each, loop a short track. The audio ends with the video, and the picture is copied without re-encoding. All in your browser.
How it works
- Add a video and an audio file (MP3, WAV, M4A, OGG and others).
- Choose whether to replace the video sound or mix the track with it, and set the volume.
- Click Add audio and download the video.
Frequently asked questions
What if the music is shorter or longer than the video?
A longer track is cut where the video ends. A shorter one repeats from the start — or, if you untick looping, the rest of the video stays silent.
Can I add one song to several videos?
Yes. Add the videos and one audio file: each video gets the track. If there are several audio files, the first one is used.
Is it free?
Yes. All tools are free, with no sign-up and no watermarks.
Are my files uploaded to a server?
No. Everything runs in your browser, so your files never leave your device.