Add Audio to Video
Choose a video and an audio file, then decide how they should combine.
Replace or mix
- Replace removes the original sound, for example to put music over a silent slideshow or remove background noise.
- Mix keeps people talking and adds music underneath. Set the music to 25–50% so voices stay clear.
Length
The result is always as long as the video. Longer audio is cut at the end, and shorter audio can repeat (loop) until the video ends. The picture is copied as it is, without re-encoding, so quality is unchanged and processing is fast. The new sound is saved as AAC in an MP4 file.
Music rights
Only use music you have the rights to. Platforms such as YouTube, Facebook and Instagram mute or block videos with copyrighted songs. Royalty-free libraries such as the YouTube Audio Library are a safe source. To make the soundtrack evenly loud first, use the Audio Normalizer.
Privacy
Your file is processed on our server only to make your result, and is deleted when you download it or automatically after about an hour. It is never shared or used for anything else.
How it works
- Upload — select or drag & drop your file.
- Process — choose any options and start; most files take a few seconds, large files, OCR and video can take a minute or two.
- Download — save the result; it is deleted from the server once downloaded (or after about an hour).
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