Add AI Audio to Any Silent Video — Free Tool
Tired of silent AI videos? You already generated an incredible clip on Runway, Pika, Sora, or another tool. It looks amazing. It has zero sound. Upload it to ZSky AI and get synchronized audio added in seconds. No editing software. No audio engineering. Just upload and download.
Upload a Silent Video, Get Audio Back
Works with videos from any AI generator. Free, no editing software needed.
Add Audio to Video →Works With Videos From Any Platform
ZSky AI's silent-to-audio tool is not limited to videos made on our platform. Upload silent video files from any source and get AI-generated audio added automatically:
How It Works
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Upload Your Silent Video
Drag and drop any silent MP4, WebM, or MOV file into ZSky AI. Works with files from any AI video generator, screen recordings, or any other source.
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AI Analyzes Visual Content
The AI watches your video frame by frame. It identifies environments (indoor, outdoor, urban, nature), actions (walking, running, water movement), weather (rain, wind, thunder), and mood (calm, dramatic, energetic).
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Download Video with Audio
In 15-45 seconds, the AI generates and synchronizes matching audio. Sound effects align with visual events. Background music matches the scene mood. Download the finished MP4 with audio embedded.
What the AI Hears in Your Video
The audio generation engine analyzes visual content and maps it to appropriate sounds. Here are examples of what it generates for different scene types:
Beach / Ocean Scene
Video: Waves rolling onto shore, aerial coastline
Audio: Ocean waves, seagulls, wind, gentle ambient music
City Street
Video: People walking through a neon-lit street at night
Audio: Footsteps, distant traffic, chatter, ambient electronic
Forest / Nature
Video: Camera moving through dense woodland
Audio: Birds singing, leaves rustling, creek flowing, organic ambient
Storm / Rain
Video: Lightning over mountains, rain on a window
Audio: Thunder, rain hitting surfaces, wind gusts, dramatic score
Product Showcase
Video: Object rotating on a clean background
Audio: Subtle whoosh on rotation, clean corporate background music
Space / Sci-Fi
Video: Spacecraft, nebulas, alien landscapes
Audio: Deep ambient drones, electronic textures, cinematic score
Why Not Just Use an Editing App?
You could open CapCut, Premiere Pro, or DaVinci Resolve and manually add audio to your silent AI video. Here is why most creators do not want to do that:
Time
Finding the right audio, importing it, trimming to length, syncing to visual events, adjusting levels, and exporting takes 15-30 minutes per clip. ZSky AI does it in 15-45 seconds.
Software
Professional editors cost $20-55/month. Free editors have limited audio tools. ZSky AI runs in your browser. No download, no subscription.
Audio Sourcing
Finding royalty-free music and sound effects that actually match your video is its own rabbit hole. ZSky AI generates custom audio matched to your specific visual content.
Cost
Artlist ($17/mo), Epidemic Sound ($13/mo), or Adobe Stock Audio ($25/mo) for royalty-free music. ZSky AI's audio generation is included in the free tier.
Free Tier Includes Audio
Adding audio to silent videos is not a premium feature locked behind a paywall. It is included in ZSky AI's free tier. You get 200 free credits at signup + 100 daily when logged in, and the silent-to-audio conversion uses the same credit pool as all other features. No credit card required. no video watermark on any output.
If you need higher volume, paid plans start at $7/month (Starter), $19/month (Pro), or $49/month (Ultra). All tiers include audio generation at no additional cost.
Frequently Asked Questions
Your Silent Videos Deserve Sound
Upload any silent AI video. Get synchronized audio back in seconds. Free.
Add Audio Now →