QRix
Video + music file → one video with the new soundtrack.
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Yes — completely free, no watermark, no signup, no file limits beyond your device's memory.
No — everything runs on your device in the browser. Your videos never leave your computer.
Real MP4 (H.264) where your browser can encode it — Chrome, Edge and Safari — with WebM (VP9) as an automatic fallback elsewhere. Everything is transcoded on your device; nothing is uploaded.
Today the new track replaces the original; mixing both is on the roadmap.
Add Audio marries a video with a new soundtrack: drop both files and the pipeline plays them in sync into one output, replacing the original audio. The music is trimmed or the video ends the mix automatically, whichever is shorter.
It's free, private and works right in your browser — no signup, no watermark.