Video Tools
Add Music to Video
Add background music or voiceover to any video with volume mixing controls.
Your files stay on your device - processed locally via WebAssembly, never uploaded
Drop a video file or click to upload
MP4, WebM, MOV, AVI, MKV
Drop an audio file or click to upload
MP3, WAV, OGG, AAC, M4A, FLAC
Your videos are processed locally in your browser. Nothing is uploaded to any server.
Embed this tool on your website
Copy this code to add the Add Music to Video to your site for free. It runs entirely in your visitors' browsers - no API key, no usage limits.
<iframe src="https://optipix.art/embed/add-music-to-video" width="100%" height="600" style="border:1px solid #e4e4e7;border-radius:8px;" title="Add Music to Video by OptiPix" loading="lazy"></iframe> <p style="font-size:12px">Free tool by <a href="https://optipix.art/add-music-to-video">OptiPix Add Music to Video</a></p>
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About Add Music to Video
Last updated: May 2026
OptiPix Add Music to Video lets you overlay background music, voiceover, or any audio onto a video. Upload a video and an audio file, then control the volume of both the original video audio and the new music. Choose to replace the original audio entirely or mix them together. Loop the music if it's shorter than the video. Uses FFmpeg.wasm amix filter.
How It Works
FFmpeg.wasm amix filter for mixing, or -map for replacing. Volume adjustment via volume filter.
Use Cases
- •Add background music to vlogs
- •Add voiceover to screen recordings
- •Replace audio in presentations
- •Add music to slideshows
- •Create video with custom soundtrack
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Frequently Asked Questions
Mix or replace?
Volume control?
Loop?
Uploaded?
Formats?
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