Put a song on any clip in seconds. Choose a video and an audio file, set the music and original sound levels, pick where the song starts, and download. The picture is copied as it is, so it stays sharp, and nothing is uploaded: it all happens in your browser.
1. Choose your video: MP4, MOV or WebM, from your phone or computer. 2. Add the song: MP3, WAV, M4A, AAC, OGG or FLAC. 3. Set the music and original sound levels, where the song starts, and whether it loops and fades out. Press play to preview. 4. Export and download. The new video is exactly as long as your clip.
Most online editors decode every frame of your video and compress it again, which costs quality and takes about as long as the clip. This tool doesn't touch the picture. It reads the compressed video frames from your file and writes them, unchanged, into the new one, next to a new sound track made from your song. That is why a 4K clip stays 4K, the colors don't shift, and a minute-long video is done in seconds.
The exported file keeps your video exactly as it was and only changes the sound.
| Exported video | |
|---|---|
| Picture | Copied as is: same resolution, frame rate and codec |
| Sound | Your song, mixed with the clip's own sound if you keep it |
| Audio format | AAC 192 kbps stereo, 48 kHz (Opus in WebM files) |
| Length | Exactly the length of the video |
| File size | About the original's, plus roughly 1.4 MB per minute of sound |
| Watermark | None |
The song is fitted to the video, never the other way around.
| Situation | What happens |
|---|---|
| Song longer than the video | Cut at the end of the clip, with a short fade-out if Fade out is on |
| Song shorter than the video | Loops from your start point with a smooth seam, or stops if Loop is off |
| You want the chorus first | Set Song starts at to the chorus; the video begins there |
| Voices in the clip | Keep Original sound up and lower Music so the song sits underneath |
Choose your video on this page, add an audio file, set the music volume and where the song starts, then press Export and download the result. It is free, needs no account, and adds no watermark.
Yes. The video track is copied packet for packet, not re-encoded, so resolution, frame rate and sharpness stay exactly as they were. Only the sound is new: it is encoded as AAC at 192 kbps.
Yes. Use the Original sound slider to keep voices or ambience at any level, and lower the Music slider so the song sits underneath. Set Original sound to zero to replace it with the music.
The export is always exactly as long as the video. A longer song is cut at the end of the clip, with an optional fade-out. A shorter song can loop until the video ends, or stop and leave silence.
Yes. Drag the Song starts at slider to the moment you want the video to begin with, and press play to check it against the picture before you export.
No. The video and the song are read and written by your browser on your own device. Nothing is sent to Solmi or anyone else, which is also why it works on large files without waiting for an upload.
Videos in MP4, MOV and WebM up to 2 GB (1 GB on phones and tablets), and songs in MP3, WAV, M4A, AAC, OGG or FLAC. You get an MP4, or a WebM if you started from one. It needs a current version of Chrome, Edge or Safari (26 or later); older browsers get a message instead of a broken file.
You can add any audio file you have, but posting music you don't own may get the video muted or claimed on YouTube, TikTok or Instagram. Use music you made, licensed, or that is royalty free, or make an original song with Solmi's AI music generator.
Turn the song itself into a video with Solmi's AI music video generator: upload the track and it plans the shots, renders the visuals in sync with the music and adds lip sync. It is free to start.