Audio
Add Audio to Video
Combine a video with a music, narration, or sound file using replace or mix mode.
Waiting for media
Processing video...No file selected
Selected files stay on this device. File sizes shown before processing use browser metadata only, such as 1.00 MB units.
Your video is processed locally in your browser and is not uploaded to our servers. Processing starts only when you click the button — nothing happens until then.
How to use
- 1.Upload video - Choose the base video.
- 2.Upload audio - Add an audio file for music, voice, or effects.
- 3.Choose mix mode - Replace the original audio or mix both tracks with volume controls.
- 4.Export - Render and download the MP4 result.
Features
Supported formats
Privacy
Files are handled as local browser objects. BeYourTools does not upload video or audio contents, does not store filenames, and does not send media to third-party processing APIs.
FAQ
What happens when audio is shorter than the video?
The output uses the video duration and ends naturally when the video ends. Short audio stops when it reaches its own end.
Can I keep the original audio?
Yes. Choose Mix mode and adjust video and audio volume.
Is my video uploaded to a server?
No. This tool processes your files locally in your browser. BeYourTools does not upload, store, or send your media to a processing API.