Guide updated:
Place a separate audio file over a video and balance it with the original sound.
Open this guide using the “How to use this tool” link below the tool name. It includes steps, screenshots and videos for computers and phones.
Before you start
Prepare a video and an audio recording that you have permission to use.
Try with a demonstration file — video.mp4
Try with a demonstration file — audio.mp3
These small files were created for this guide and contain no personal data.
Step-by-step instructions
- Choose the video and wait for its preview and audio settings.
- Add the separate music or voice recording in the audio section.
- Set the available start position and sound levels. Decide whether to keep or replace the original video sound.
- Review the preview and any displayed price, then start processing. Keep the page open while the result is prepared.
- Play the beginning and end of the result, check that speech is audible, and save the processed video.
On a computer
Use the full-width working panel to compare the source, settings and result. Keep the original file so you can try another setting without replacing it.
On a phone
Choose the source from Files or your device file manager. Scroll down to the settings and result; keep this tab open until the operation finishes.
In Safari on iPhone, open the sharing menu and choose Save to Files if the result opens in a new tab. In Android Chrome, check Downloads. Keep this tab open until processing finishes.
For a better result
Test a short video first. Background music that sounds comfortable alone can still obscure a quiet voice.
Screenshots and video
Desktop demonstration
The recording shows the English interface. Follow the translated steps above; the controls are in the same order. This recording shows the source and available settings before the main action. Follow the steps above to start processing and save the result.
Phone demonstration
The recording shows the English interface. Follow the translated steps above; the controls are in the same order. This recording shows the source and available settings before the main action. Follow the steps above to start processing and save the result.
Questions and troubleshooting
Why does the original sound disappear?
Check the original-audio setting and its volume before processing again.
Why does the music end before the video?
The audio may be shorter than the video. Adjust the timing or use a suitable source; enable repetition only if the page offers it.
If you see a message that the service is overloaded, wait and try again later. A failed attempt does not mean that your source file has changed.
