Glowtrack Studio Add Music

Add Music to Video

Put a song or background music under any video, free in your browser. Set the music and original volumes, pick where the song starts, loop it and fade it out — and the picture isn’t re-encoded. Nothing is uploaded.

Drop a video here, or click to chooseMP4, MOV, WebM or MKV ·

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How it works

  1. Drop in a videoAny MP4, MOV, WebM or MKV.
  2. Choose a songPick an MP3, WAV or M4A, then set the volumes and the point the song starts from.
  3. DownloadGet an MP4 with the music mixed in — the picture is copied as-is, so there’s no quality loss.

Getting the mix right

Replace or mixOriginal sound at 0% replaces it; 20–40% keeps voices audible under the music.
Start pointSkip a song’s intro so the best part lines up with your video.
Loop and fadeShort songs loop to fill long videos, and a fade-out stops the music cleanly at the end.
No quality lossOnly the sound is rebuilt; the video frames are copied untouched.

FAQ

Is my video uploaded?

No. The video is processed inside your browser on your own device and never sent anywhere — so it’s fast to start and safe for private clips.

How do I add background music to a video?

Drop the video in, press “Choose a song”, adjust the music and original volumes, and press Add music.

Can I replace the original sound completely?

Yes — drag “Original sound” to 0%.

What music can I use?

Music you made, music you’ve licensed, or royalty-free tracks whose licence allows it. Popular songs usually get your video muted or blocked on social platforms.

Can I post the result on YouTube, TikTok or Instagram?

Yes, if you own the footage and any music in it, or have permission. You’re responsible for what you upload — platforms’ copyright systems will usually match music you don’t have the rights to.

Which browser works best?

Chrome or Edge on a computer are fastest, because they use your graphics card to encode video. Safari works for most files; phones work for shorter clips.

Is it free?

Yes — free, no sign-up and no watermark. The site is supported by the ads on the page.

More free video tools

Trim videoCut the start and end off, or cut a section out. Merge videosJoin clips into one video. Video speed changerSlow motion, timelapse or 2×. Rotate videoTurn or flip a sideways video. Music visualizerMake a video from a song instead.