Merge Video and Audio Online — Free, No Upload
Combine a video file with an audio track — free, in your browser, no upload.
Tool Interface
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About This Tool
Add Music or Narration to Any Video
The Merge Video and Audio tool combines your video file with an audio track in seconds. Select a video (MP4, MOV, WebM, MKV) and an audio file (MP3, WAV, OGG, M4A), press Merge Video and Audio, and download the finished video.
The video stream is copied without re-encoding, so merging is fast and lossless. The audio is converted to high quality AAC for universal compatibility. Everything happens locally in your browser using open source FFmpeg technology. Files are never uploaded. It is free with no signup and no watermark.
How to Use the Merge Video and Audio Tool
Three steps to your finished video.
- Select your video: Choose an MP4, MOV, WebM or MKV file.
- Select your audio: Choose an MP3, WAV, OGG or M4A track.
- Merge and download: Press Merge Video and Audio, then download your merged video when ready.
Great Uses for Merging
- Background music: Add a soundtrack to silent footage.
- Voiceovers: Pair narration with screen recordings.
- Replacing audio: Swap the original sound for a better track.
- Presentations: Combine slides exported as video with spoken audio.
Key Features
- Any video plus any audio: Broad format support on both sides.
- Lossless video copy: The picture stream is never re-encoded.
- High quality AAC: Audio converted for universal playback.
- 100 percent private: Files are processed locally in your browser.
- Free forever: No signup, no watermark, no hidden costs.
Frequently Asked Questions (FAQ)
Is the Merge Video and Audio tool free? Yes. It is completely free with no signup and no watermark.
Will I lose video quality? No. The video stream is copied without re-encoding.
Are my files uploaded? No. Everything is processed locally in your browser. Nothing leaves your device.
Which formats work? Video: MP4, MOV, WebM, MKV. Audio: MP3, WAV, OGG, M4A.
What happens to the original audio? The new audio track replaces it in the merged output.
How long does it take? Merging is fast since the video is not re-encoded. Time depends mostly on file sizes.
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