How to do it, step by step
- Choose the video (or an image).
- Choose the music or audio.
- Mix with the original sound or replace it, and adjust the volumes.
- If the music is longer than the video, choose where it starts; turn on the fade and export.
When this is useful
Put a soundtrack on a video with no sound
Choose the music and export.
Swap a video’s sound
Use “Replace” to silence the original audio.
Make a video from an image and a song
The image lasts as long as the music, up to 30 seconds.
Tips for a good result
- The music volume goes from 0 to 200%, and so does the original audio’s.
- With the fade option on, the start and end of the music are smooth.
What this tool does not do
- One music track at a time.
- The music is cut to the video’s length.
- Everything happens in the browser: the video is not sent. Large files depend on the device’s memory and capacity.
- The video is rebuilt on export (it is not a direct copy): choose the quality and size under Export.
- MP4 depends on the browser having an H.264 encoder; without it, the app records in real time (it takes as long as the video, with the tab open).
- This page does only this task. Timeline, texts, effects and animations are in the full editor.
Frequently asked questions
- Can I keep the original sound?
- Yes. Under “Mix with the music” the two play together, each at its own volume.
- And if the music is shorter than the video?
- It ends before the video’s end: the app does not repeat the music.
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Text written by Marcelo Amantino · updated October 18, 2026 · who we are