Original Video
PrismAudio Output
AI Generated
🧊 Ice Break
CrackStrikeIce
AI-Powered Sound Synthesis
Video to Audio Generator — AI-Powered Sound Synthesis
Upload your video and PrismAudio's AI creates synchronized sound effects automatically. Works with any video — including AI-generated content from Sora, Veo3, and Kling. Free. No account needed.
PrismAudio turns your video into spatial, synchronized sound—AI-generated audio that follows what happens on screen, not just a format rip. Upload, tune prompts, and preview results right here.
See What PrismAudio Generates
Original Video
PrismAudio Output
AI Generated
🏊♀️ Indoor Swim
WaterGlideRipple
Original Video
PrismAudio Output
AI Generated
🤖 Sora AI Video
MetalImpactEarth
Original Video
PrismAudio Output
AI Generated
⚔️ Action Scene
OpenPourRustle
Original Video
PrismAudio Output
AI Generated
🌊 Packing Tape
UnrollRipPress
Original Video
PrismAudio Output
AI Generated
🗜️ Cardboard Piercing
PressScrapeCraft
How PrismAudio's AI Generates Audio from Video
Unlike converters that just change file formats, PrismAudio actually creates new audio by understanding what's happening in your video.
Here's what happens when you hit Generate:
01
Scene Recognition
The AI identifies every object, action, and environment in your video – a person walking, rain falling, a car passing, a crowd in the background.
02
Sound Matching
For each detected event, PrismAudio selects and synthesizes the matching audio – footsteps that sound like the surface they're walking on, rain that matches the rainfall intensity, engine sounds that match the vehicle type.
03
Timing Lock
Every sound is locked to the exact frame it belongs to. The AI checks sync accuracy down to fractions of a second.
04
Spatial Rendering
Sounds are placed in a stereo field. Something on the left of the frame sounds like it's coming from your left speaker or left headphone. No other tool does this automatically.
Get Better Results with Audio Style Prompts
The style prompt is optional – PrismAudio works great without one. But if you want to guide the mood or genre, here's how:
Useful prompts:
- "Cinematic, dramatic – heavy impacts and tense atmosphere"
- "Nature documentary style – peaceful, ambient, no music"
- "Action sequence – fast cuts, punchy sound design"
- "Quiet office scene – subtle, realistic background sounds"
Skip these:
- "Make it sound cool" – too vague for the AI to act on.
- "Add a piano melody" – PrismAudio generates sound effects, not music compositions.
Tip: Leave the prompt blank and let PrismAudio decide. It reads the video, not just your words.
PrismAudio FAQs
Q: What is a video to audio generator?
A: A video to audio generator creates audio that matches what's happening in a video. PrismAudio goes further than simple file converters – it uses AI to generate brand-new, synchronized sound effects for any video, including completely silent ones.
Q: How do I convert a video to audio using AI?
A: Upload your video to PrismAudio's free generator, optionally add a style prompt, and click Generate. The AI analyzes your video and creates matching audio in under 1 second. Download the video with audio, or the audio file separately.
Q: Is this video to audio generator free?
A: Yes. PrismAudio's generator is free with [X] generations per month – no account or credit card required. Paid plans start at $19/month.
Q: What's the difference between PrismAudio and a regular video converter?
A: A regular converter (like VEED or Kapwing) extracts existing audio from a video or changes its format. PrismAudio generates completely new audio from scratch, even for videos that have no sound at all.
Q: What video length and file size are supported?
A: Free tier: up to 60 seconds and 50MB. Pro plan: up to 2 minutes. Studio plan: no time limit. Formats: MP4, MOV, AVI, WebM, MKV.
Q: Can I use the output commercially?
A: Commercial use is available on Starter plans ($19/month) and above.
Q: How is PrismAudio different from MMAudio?
A: PrismAudio generates spatial stereo audio – sounds are positioned based on where they appear in the frame. MMAudio outputs mono only. PrismAudio is also 2x faster and handles complex multi-sound scenes better. See the full PrismAudio vs MMAudio comparison ->
Final step
Looking for more information before you generate?
No signup required · No credit card · Works with any video format
Trusted by AI video creators, filmmakers, and game developers