Add audio to a video
Put a music track or voiceover onto a video.
Drop your file here
Processed securely and deleted within the hour.
Replace or mix
Replace drops the original sound entirely and uses only the track you add. Right for a silent screen recording, a timelapse, or footage whose original audio is unusable.
Mix keeps both, layering the new track underneath. Right for background music behind speech — which is where the volume control matters most, because music at full level buries a voice completely. Around 20 to 30% is usually right for music under dialogue.
Order does not matter
Drop in the video and the audio in whichever order you like. The tool inspects both files and works out which is which, rather than assuming the first upload is the video.
When the lengths differ
They almost always do. The output ends when the shorter of the two runs out — so a three-minute song over a one-minute clip gives you a one-minute video with the first minute of the song, and a short jingle over a long clip leaves the rest silent.
If you need the music to fit exactly, trim it to the video's length first.
The video is not re-encoded
The picture is copied straight through and only the audio is written, which makes this fast even on a long clip and costs nothing in quality.
A word on music rights
Adding a commercial track to a video you intend to publish is a copyright question, and platforms detect it automatically. That is entirely yours to manage — but it is worth thinking about before, rather than after, the upload is muted or removed.
Common questions
Does it matter which file I add first?
No. The tool inspects both and works out which is the video.
What if the music is longer than the video?
The output ends when the shorter one runs out. Trim the audio first if you need it to fit exactly.
Can I keep the original sound too?
Yes, choose mix. Around 20–30% volume works for music under speech.
Is the video quality affected?
No. The picture is copied through and only the audio is written.
Can I use any song?
Technically yes; legally it depends on the rights. Platforms detect commercial tracks automatically.