Make a vertical version for Reels and Shorts
You get: A 9:16 vertical MP4 that keeps the audio.
Add audio to video online
Attach a video and an audio file, such as a voiceover or narration, and tell Manus how to combine them. You get one MP4 file back, and you can ask for a next step, such as a vertical version or a shorter clip.
How to add audio to a video
Three steps from two files to one video with sound.
What to do after you add audio to video
Pick a next step to fill in a request that adds the audio and does that step too. You can also ask for the next step in the same task after you get the MP4.
Keep only the part you need
You get: A trimmed clip of the part you say to keep.
Split it into short clips
You get: Separate MP4 clips, each as long as you ask.
Combine audio and video in one request
Here is one real request, the two files it used, and the MP4 that came back.
The resultOne MP4, 8 seconds, with sound
A real result from simple test files. Press play to hear the audio.
Put audio on a video for voiceovers, narration, and silent clips
Pick an example to start from it.
Voiceovers for screen recordings
Add a voiceover you recorded to a screen recording or a tutorial.
Narration for product videos
Add narration to a product or demo video.
Sound for silent clips
Give a clip with no sound an audio track, such as a recording or a music file you already have.
What you get back
Each request runs as a Manus task and uses credits. See pricing
Frequently asked questions
How do I add audio to a video online?
Attach your video and your audio file in the box at the top of this page, then ask Manus to add the audio to the video. Manus gives you one MP4 file in the task, ready to download.
Can I add audio to a video for free?
Each request runs as a Manus task, and tasks use credits. You can see the details on the Pricing page.
What if the audio is longer than the video?
Manus tells you how it handled the difference. For example, a 12-second audio file can be cut to fit an 8-second video, and the reply says so. To get a different result, reply in the same task.
Can I add a voiceover to a video?
Yes. Save your voiceover as an audio file first. Then attach it with your video and ask Manus to add it.
Can I add audio to a video on my iPhone or Android phone?
Yes. Open this page in your phone's browser, sign in, attach the video and the audio file, and send your request. You can download the MP4 from the task.
How do I download my video with the audio added?
When Manus finishes, the MP4 appears in the task. Open it and use the download button.
What else can Manus do after adding the audio?
You can ask for a next step, such as a 9:16 vertical version, a trimmed clip of the part you want to keep, or several short clips. After you get the MP4, you can ask for a next step in the same task, for example a 9:16 vertical MP4 that keeps the audio. You do not need to upload the files again. The cards under "What to do after you add audio to video" fill in a new request that asks for both steps.