What does Add Audio to Video do?
Add background music or replace a video's soundtrack with an audio file.
Add Audio to Video accepts MP4, WEBM, MOV, MKV, AVI, M4V, MP3, WAV, OGG, M4A, AAC and FLAC files — and you can add several at once, and produces MP4 output.
Your MP4, WEBM, MOV, MKV, AVI, M4V, MP3, WAV, OGG, M4A, AAC and FLAC files are processed locally in your browser — they are never uploaded to our servers.
How to use Add Audio to Video
- 1Drag and drop your files onto the upload area, or click “Choose files”.
- 2Adjust the add audio to video settings to suit your needs.
- 3Click the main action button and wait a moment while it is processed on your device.
- 4Preview the result and download your MP4 files.
Supported formats
- Input
- MP4WEBMMOVMKVAVIM4VMP3WAVOGGM4AAACFLAC
- Output
- MP4
Frequently asked questions
Is Add Audio to Video free?
Yes. Add Audio to Video is completely free with no sign-up and no watermarks.
Are my files uploaded?
Your MP4, WEBM, MOV, MKV, AVI, M4V, MP3, WAV, OGG, M4A, AAC and FLAC files are processed locally in your browser — they are never uploaded to our servers.
Is there a file size limit?
Free usage supports files up to 500 MB. Because processing happens on your device, very large files depend on your device's available memory.