Upload a video and one or more audio tracks, choose the base clip, then adjust volume and start offset for every sound. The service mixes tracks with the original video audio or replaces it and saves the finished result as MP4.
Use the tool for voice-over work, background music, sound effects, comments, presentations and short clips without installing a desktop video editor.
This tool accepts these formats. Uncommon containers and modern web formats may be normalized or converted on the server before processing.
A damaged file or a non-standard codec can still fail even when the extension is supported.