New soundtrack. Same video story.
Replace the sound in a video with an uploaded audio file. Choose how different durations should behave, preview the combination and export your new soundtrack.
Free account · Local uploads · Background processingReplace video audio. From source to download.
- 01
Upload your source
Sign in and upload a local file. Inspection checks the streams and duration.
- 02
Adjust the operation
The relevant settings section opens after inspection. Review the starting values below.
- 03
Preview and review
Render a short processed preview where applicable, then save and review the full task.
- 04
Convert and download
Follow background processing and download the validated output.
Replace video audio settings
Choose the operation here and it stays selected through registration or sign-in. Upload and inspect your source to open its settings. Starting values are editable; check them against your file before submitting.
Upload audio
Add and inspect your replacement recording after uploading the video.
Audio source
Replace with uploaded audio is selected on entry.
Duration policy
Trim to video, pad with silence or end at the shortest track.
What to check before exporting
The original tracks are excluded in replacement mode. A positive audio offset delays the selected sound; a negative offset skips its beginning. This is a file-based workflow with a shared offset, rather than a multitrack timeline editor.
Choose a compatible output profile and review the source streams, selected range and final settings. Processing uses structured controls, and incompatible combinations are rejected before queueing. Download the requested result when final validation completes.
A real workspace. A result you can inspect.
This actual product screenshot shows source playback, range selection, an uploaded-audio area and encoding settings. It illustrates the shared converter; your operation opens its own relevant controls after inspection.
A processed preview creates a separate short task. It covers the first ten seconds of your range at up to 360p in a compatible format. Image and subtitle exports still need inspection of the requested final download.
Explore the Media Converter overview →
Questions about this workflow
Can I keep the original sound as well?
Use Add Audio Track to retain the original and uploaded audio as separate tracks, or enable mixing to combine selected tracks into one soundtrack.
Can I close the tab while processing?
Yes. Submitted conversion tasks run in the background. Return to your account to check progress and download results before the retention period ends.
What are the upload and storage limits?
Current source limits are 2 GiB and two hours per file. Files have a 72-hour retention period; task, collection and resource limits also apply. The workspace shows the applicable limits. Free and Pro currently share feature access.
Keep working with your media.
Add audio track
Add an uploaded recording as a separate audio track while retaining selected original tracks in a compatible video container.
Audio delay
Adjust audio timing with a positive delay or a negative offset while preparing your video output.
Mix audio
Mix selected source audio and up to four uploaded audio files into a single output soundtrack.