Silent Clip,
Now It Has Sound
Upload a silent clip and describe the sound — ocean waves, footsteps, room tone. Inflyu generates matching effects and ambience for 1 credit. Create an account to run it.
For UGC and product clips shot without audio
Sound design without a foley pass
1 credit per clip, up to 30 seconds of source.
Prompt to sound
Describe the sound in plain text — the model generates effects and ambience to match.
30 second cap
Source clips up to 30 seconds are accepted; longer clips are refused, not silently trimmed.
Flat 1 credit
1 credit per clip regardless of length, on any credit pack.
Picture stays untouched
Only the audio track is generated — the video itself is not re-rendered.
Keeps the original
Output is a new file in your gallery. The silent source stays intact.
Register to run
No anonymous add-sound. Credits and R2 storage need a user.
Add sound to a clip
Account, clip, prompt, generate.
Create an account
Sign up so the job and refunds attach to you.
Upload the silent clip
Up to 30 seconds — longer clips are refused up front.
Describe the sound
Type what you want to hear and generate for 1 credit.
AI Add Sound to Video FAQ
How much does add-sound cost?+
A flat 1 credit per clip, regardless of length, on any credit pack.
How long can my source clip be?+
Up to 30 seconds. Longer clips are refused before any credit is charged, not silently trimmed.
Does it change the picture?+
No. Only the audio track is generated — the video itself is untouched.
Do I get a free run without signup?+
No. Video jobs need an account for credits and storage. Registration itself is free.
Do I need a subscription?+
No. You can pay as you go: credit packs are one-time purchases and their credits never expire. If you would rather have a steady supply, the monthly Starter ($7.99), Creator ($19) and Pro ($49) plans refill your credits each month, and you can cancel anytime. Unused monthly credits do not roll over.