How to add AI sound effects to a silent video

Attach the silent clip and ask Recut to "add sound to this video". It runs a video-to-audio model that watches the picture and generates matching sound effects and ambience, such as footsteps, waves or a door closing, in time with what happens.

Step by step

1. Attach the silent videoAI-generated clips often come without sound; screen-free footage and B-roll work too.
2. Describe the soundOptional, but it helps: "rain on a window, distant thunder".
3. Pick the modelRecut suggests video-to-audio models such as Mirelo, Kling video-to-audio, Sonilo and MMAudio, with their prices.
4. Run and mixThe model returns the video with its new sound. Add music or a voiceover on top in the same plan if you need them.

What Recut does

A video-to-audio model looks at what moves in the frames and when, and generates sound that fits the action and the setting. Recut handles uploading the clip, filling in the model's settings from your words and saving the result.

For one particular sound rather than a full soundtrack, ask Recut for a sound effect from a description instead, then mix it onto the video at the time you want.

Video models often return clips without sound, so this step is a common one in Recut plans: make a scene, give it sound, then join the scenes and lay music and narration on top.

Tips

• Mention what matters most; the model may otherwise give ambience but miss a key moment.
• When you make a film from generated clips, ask for sound in the same plan, before the clips are joined.

What it doesn't do

• Speech isn't what these models are for. Use a voiceover for words.
• Timing and realism vary by model and by how clear the action in the clip is.

Related guides

• How to add music to a videoAdd your own track to a video with Recut, set its volume, start time and fade-out, or have Recut compose music for the video from a description.
• How to add an AI voiceover to a videoPaste a script, pick a voice, and Recut reads it with an AI voice model and lays the voiceover on your video, with music turned down under it.
• How to make a short video ad with AI from a promptDescribe the ad in one sentence and Recut plans the scenes, makes each clip, the narration and the music, and assembles one finished video.