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Add Audio to Video


Drag the video here (mp4, m4s, mov...)


Drag the audio here (mp4, mp3, m4s...)

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Note: This tool is executed entirely in your local browser. Therefore, due to factors such as device performance, it is relatively time-consuming when processing large files. Thank you for your understanding!

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FAQ

No. The entire audio and video synthesis process takes place in the browser. There is no uploading of files to the server and no need to download any files, fully ensuring user data security and ease of use.
The synthesis time depends on the size and complexity of the video and audio. Generally, synthesis can be completed in a relatively short time.
We support common video formats such as MP4, MOV, MKV, etc., and common audio formats such as MP3, WAV, etc.
You can check if the video and audio files meet the format requirements supported. Or try reuploading the files and perform synthesis again. If the problem still persists, you can contact our technical support team.
During the synthesis process, the quality of the original video and audio will be maintained as much as possible and it will not have a significant impact on video quality.
Generally, modern browsers can support it well. For a better experience, it is recommended to use a newer version of a mainstream browser.