AI-Generated Videos
Most AI video models output silent clips. Run them through here and post with sound — ambience and foley that match the motion, no editor needed.
Add Audio to Video with AI
The AI video sound effects generator. Upload a silent video, optionally describe the sound, and get it back with perfectly synced audio — footsteps, ambience, foley — merged and ready to post.
Your videos with audio
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REAL OUTPUTS
Hear What AI Adds to Silent Video
Every clip below started silent. The AI watched the frames, generated matching sound — water, purring, laughter, footsteps — and merged it back. Click to listen.
USE CASES
What Creators Fix with AI Video Sound
Muted or Broken Audio
Wind-ruined vlog audio, muted screen recordings, clips shot from too far away — replace the missing track with clean, scene-matched sound.
Ads & Product Clips
A product spin with a satisfying whoosh converts better than a silent one. Generate subtle, professional sound design for marketing clips in seconds.
PROCESS / N·03
How to Add Audio to a Video
- 01
Upload your video
MP4 or MOV, up to 60 seconds. The duration and price show instantly — no account needed to preview.
- 02
Describe the sound (or don't)
Leave it empty and the AI reads the scene, or guide it: "rain on a tin roof", "crowd cheering", "soft piano ambience".
- 03
Pick a quality and generate
Standard for quick drafts, Premium for the most realistic sync. The audio is merged into your video — download and post.
FAQ / REEL NOTES
Add Audio to Video — FAQ
Q01How does AI add audio to a video?
The model watches your frames — motion, objects, environment — and generates a soundtrack that matches what's happening on screen, synced to the action. You can optionally steer it with a text description. The result comes back as a normal MP4 with the audio already merged, so there's nothing to line up in an editor.
Q02Is this different from adding music to a video?
Yes. Music overlay tools paste a song over your clip. This generates scene-aware sound effects and ambience — footsteps when someone walks, waves when there's water, room tone that matches the space. For background music you can describe it in the prompt (e.g. "soft piano ambience"), but the strength here is realistic, synced sound.
Q03What video formats and lengths are supported?
MP4 and MOV, up to 100MB. Standard quality handles videos up to 30 seconds; Premium goes up to 60 seconds. The price is per second of video — you see the exact credit cost before you generate.
Q04Is it free to add audio to a video?
New accounts get free credits to try it. After that it's pay-per-use: Standard costs 2 credits per second of video and Premium costs 8. A typical 8-second AI clip costs 16 or 64 credits, and failed generations are automatically refunded.
Q05Which quality should I choose?
Premium won our blind listening tests for realism and sync, handles up to 60 seconds, and is the recommended default. Standard is great when you're iterating quickly on short drafts and want to spend fewer credits per try.
Q06Does it work on AI-generated videos?
That's the main use case. Videos from AI generators — including everything made on this site — come out silent. Every video card here has an Add Audio button that drops the clip straight into this tool, so you can generate, add sound, and download in one flow.
THE FINAL CUT
Give Your Video a Voice
Upload a silent clip and hear it come alive with synced AI sound. Free credits to start, and credits are refunded if a render fails.
Free credits for new accounts · Credits refunded on failure