Merge Video and Audio

Add or replace audio in a video file online. Merge any video with any audio track. No upload needed.

About this tool

Add or replace audio in a video file online. Merge any video with any audio track. No upload needed. All processing happens directly in your browser — your files are never uploaded to any server, ensuring complete privacy.

✅ Free to use, no sign-up required
✅ Files never leave your device
✅ Powered by WebAssembly — no plugins needed
✅ Works on any browser and device