Add Audio to Video Online Free - Replace Video Sound
Add audio to video or replace existing sound for free. Add music, voiceover, or custom audio to MP4 videos. No watermark, 100% browser-based.
Click to upload or drag and drop
VIDEO/* • Maximum file size 500 MB
Click to upload or drag and drop
AUDIO/* • Maximum file size 100 MB
Why Use Toolzilla Audio to Video Tool?
Replace Audio Track
Replace existing video audio with custom music, voiceover, or narration. Perfect for video dubbing.
Add Background Music
Add background music to silent videos or replace boring audio with engaging soundtracks.
Add Voiceover
Add professional voiceover or narration to your videos. Perfect for tutorials and presentations.
100% Private
Your videos and audio files stay on your device. All processing happens locally in your browser.
No Watermark
Get clean videos with your custom audio. No watermarks, no branding, 100% yours.
Multiple Formats
Support for MP4, WebM, AVI videos and MP3, WAV, M4A audio files. Mix and match freely.
How to Add Audio to Video - 3 Easy Steps
Upload Video File
Select your video file (MP4, WebM, AVI, etc.). This is the video that needs new audio.
Upload Audio File
Choose your audio file (MP3, WAV, M4A, etc.). This will replace the video's audio.
Process and Download
Click "Add Audio to Video" to merge them. Preview and download your video with new audio.
Frequently Asked Questions About Adding Audio to Video
Everything you need to know about replacing video audio with Toolzilla
Related Tools
Explore more tools that might be useful for your needs
Frequently Asked Questions
Everything you need to know about this tool
Related Tools
Explore more tools that might be useful for your needs