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 Add Audio to Video
- 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.
Add Audio to Video Features
Supported Add Audio to Video 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.
Video Standards & Simple Playback Guide
Working with video requires balancing file size with clear playback. Using Add Audio to Video helps you prepare clean video clips that play smoothly on any phone, tablet, or computer. Whether you need smaller clips for email or fast-loading videos for your website, our tool gets the job done quickly.
Fast Browser Processing
All video slicing, frame capture, and encoding run directly inside your browser. Your computer or phone handles the work locally, so your large video files never upload over the web.
Everyday Compatibility
Your saved clips keep standard screen shapes, true colors, and clean sound. They open immediately in Apple QuickTime, Windows Media Player, Chrome, and Safari without extra plugins.
Add Audio to Video Frequently Asked Questions
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.
Does processing reduce the quality or resolution of my original video?
Trimming, cutting, and frame extraction keep your original video resolution and picture clarity. Our compressor tool lets you choose how much file size to shave off while keeping your picture sharp.
Are my personal videos uploaded to or viewable by anyone else?
No. All video editing happens right in your browser memory. Your files are never sent to our servers or saved anywhere online. Everything stays safe on your own device.