Add music to a video in your browser: replace its sound, mix the music under it, lower the music while people talk, or just mute the video, with volume, looping and a fade out.
Check supported input/output details and follow the tool steps before exporting.
Use these specs to confirm browser fit, privacy boundaries, and export behavior before you add music to a video.
Cost
Free, with no signup.
Security
Mixing runs in your browser; nothing is uploaded to ToolBuddy.
Input
MP4, MOV, WebM, or MKV video, up to 2 GB on desktop and 250 MB on mobile. Music: MP3, M4A, AAC, WAV, Ogg, Opus or FLAC.
Output
MP4 (H.264, AAC) where supported, otherwise WebM.
Modes
Replace, mix, lower under speech, or mute.
Check supported input/output details and follow the tool steps before exporting.
01
Select or drop a video, or try the sample.
02
Choose replace, mix, lower under speech, or mute.
03
Choose a music file and set the volumes, where the music starts, looping and the fade out.
04
Save the video, then download it or open it in another tool.
Understand how to add music to a video in the browser, why it matters in repeat workflows, and when to use this tool with confidence.
Replace the sound, mix the music under it, lower the music while people talk, or remove the sound altogether.
Start the music at any point, loop it when it is short, set both volumes, and fade it out over the last seconds.
Ducking is measured from the video's own sound on your device. The picture is re-encoded at high quality.
Have more questions? Reach out via our contact page and we will respond within 24 hours.
No. The video and the music are read and mixed in your browser and never leave your device.
The video's own sound is measured on your device; while it is loud, such as when someone talks, the music drops to a quarter of its volume, then comes back.
With loop on it repeats until the video ends; otherwise it plays once.
MP3, M4A, AAC, WAV, Ogg, Opus and FLAC, as your browser can read them.
Yes. Choose mute and save; no music is needed.
See real workflows where this tool fits naturally, then jump straight into the matching guide.
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Read intent-focused guides, then jump straight into the live tool workflow.
Join several videos into one in your browser, in the order you set, at one shape (or the first video's), with cuts, fades or crossfades, and save it as MP4 without uploading.
Trim MP4, MOV, WebM, or MKV video locally on a thumbnail timeline: keep one part or several, cut out a section, or split it into equal parts, with a lossless fast cut or a frame-accurate precise cut.
Burn SRT or VTT captions into a video locally, or generate them from English speech, with style presets, one to five words at a time, a caption editor, and font, colour, outline, box, and position.
Compress MP4, MOV, WebM, or MKV video locally to a target size or a quality level, with size presets, HEVC or AV1 where your browser supports them, and resolution, frame-rate, and audio options.
Add Music to Video
Add music to a video in your browser: replace its sound, mix the music under it, lower the music while people talk, or just mute the video, with volume, looping and a fade out.
Why ToolBuddy?
Private & Secure — Files stay on your device
Files stay on your device while you work.
Fast Browser-Based Processing
Processing happens locally in your browser for quick results.
No Uploads, No Data Stored
Nothing is uploaded to or stored on our servers.
Free Tools — No Account Required
Use the tool for free with no account or app install.
