Put a track onto a video: replace its sound, or mix both with separate levels and fades. Length handling is spelled out, and the picture is never re-encoded.
Your files are processed in your browser, on your own device. Nothing is uploaded to a server.
A silent clip plus the right track is a finished video. This tool puts an audio file onto a video, and it treats the picture with respect: the video stream is copied in every mode, never re-encoded, so the job is quick and the quality cannot drop. What you control is how the two sounds and lengths fit together.
Replace mode swaps the video’s sound for your file, the standard fix for a clip recorded in a noisy room. Mix mode keeps both and lets you set each one’s level, which is how a voiceover sits over quiet background music. The length choices are where these tools usually cheat, so they are spelled out: loop the audio until the video ends, play it once and let the rest be silent, or end the video when the shorter of the two ends.
1. Drop the video first, then the audio file, or drop both together. The list shows which is which. Together they can be up to 500 MB, with the audio up to 100 MB.
2. Choose Replace or Mix. In Mix, set the level of the original sound and of the added track.
3. Choose what happens when the lengths differ: Loop the audio, Play once then silence, or Shortest ends the video.
4. Optionally fade the added audio in and out. Press Add the Audio and download.
Start with the original at full level and the added track at half, the defaults here. Music under speech usually wants to sit lower, around a quarter. The mix is written without boosting anything past its own level, so a loud result means lowering one side, not the tool misbehaving. Short fades at the start and end stop music from cutting in like a door slam.
The engine note: this runs a real encoder inside your browser. The first job downloads about 31 MB of engine files once, your browser caches them, and your video itself never leaves the device.
There is no music library and no stock audio here: bring a track you have the right to use, your own recording, a licensed song, a voice note. The tool adds the first track of your audio file. If you choose Mix on a video that turns out to have no sound of its own, the tool falls back to Replace and tells you it did. The output is an MP4, or a WebM when your video is a WebM. To silence a video instead, use mute video. The rest of the family is in the video tools collection.
The tool will put any audio file on any video, because it cannot know whose either file is. That knowledge is yours: a song from your library is licensed for your listening, not automatically for publication under your video, and platforms scan for exactly that. Your own recordings, commissioned music and properly licensed royalty-free tracks are the safe material, and a muted or replaced track is a common way an honest mistake gets fixed after the fact.
No. The picture is copied in every mode. Only the sound is written, so the job is fast and the image stays exactly as the source.
You choose: Loop repeats it until the video ends, Play once fills the remainder with silence, and Shortest cuts the video to the song’s length. The choice is on the page before you run the job.
Yes, that is Mix mode. Set the original level and the added level separately. Half volume for the added track is a sensible start, a quarter under speech.
From your own files: a recording you made, a track you licensed, or royalty-free music you downloaded from its source. This tool deliberately ships no library, because rights are yours to arrange.
MP3, WAV, M4A, AAC, OGG, Opus and FLAC, up to 100 MB. The first track of the file is used.
Neither file leaves your device. The combined video is built in your browser tab.
Same rules as this one: free, in your browser, with nothing uploaded.
Take the sound out of any video as an audio file.
The classic job. Video in, MP3 out.
Move between MP4, WebM and MOV without a fight.
A smaller video for WhatsApp, email and uploads.
Cut the dead seconds from the start and end.
Turn a short clip into a GIF that loops.
Any video file in, a plain MP3 of its sound out.
Join clips end to end into one video file.