AI Sound Generator for Video
Get audio generated with the picture rather than added after: ambience, effects, and dialogue that stays in sync. Veo 3.1 goes furthest. Free credits.
What can you create with AI Sound Generator for Video?
AI sound generated with the video
There is a real difference between audio generated with the picture and audio added afterwards. Generated together, the sound and the motion were decided by the same pass, so footsteps land on footfalls and the room tone matches the space you are looking at. Added afterwards, everything has to be aligned by hand, and small misalignments are exactly what makes a clip feel synthetic.
Which models produce native audio
Twelve of the sixteen video models produce native audio. Most give you ambience and incidental effects appropriate to the scene — wind, traffic, room tone, water. Veo 3.1 is the one that goes furthest, generating dialogue that stays in sync with mouth movement rather than just plausible background. If sound is load-bearing in your piece, that choice narrows the field considerably.
Dialogue sync vs ambient effects
Ambient audio and dialogue sync are different problems. Ambience only has to be plausible and roughly matched to the scene; nobody notices if the wind is a beat late. Dialogue has to align to the frame, because a mouth and a word that disagree is the single most obvious artefact in AI video. Most models do the first well and the second not at all.
When you still need a separate audio pass
You still want a separate audio pass when the piece needs music, when dialogue has to match a script exactly, or when the mix matters — levels, ducking, spatial placement. Generated audio is very good at making a single shot feel real and is not a substitute for a soundtrack. The practical workflow is to keep the generated ambience and layer everything else on top.
Audio and commercial licensing
Paid plans include a full commercial license covering the audio as well as the picture. The usual caution applies to anything that sounds like a real, identifiable voice: do not generate speech that impersonates a specific person. Generic voices, ambience and effects are fine for advertising and client work under the standard license. Generic voices, ambience and effects are fine for advertising and client work under the standard license that ships with every paid plan.
What usually goes wrong, and how to avoid it
Native audio is convincing for ambience and unconvincing when it tries to carry meaning. Generated dialogue in a language the model handles poorly, or a specific sound the scene requires — a particular machine, a named piece of music — will come back generic. Treat the generated track as a bed. If a specific sound is load-bearing in the edit, plan to replace it in post rather than re-rolling the generation.
A quick test for whether the audio helps
Play the clip once with sound and once muted. If the muted version reads better, the generated audio is fighting the picture rather than supporting it, which happens most often when the model has guessed at a specific sound the scene needed. Strip it and lay in a clean bed in post. Generated audio is there to make a shot feel inhabited, not to carry the edit.
How to use AI Sound Generator for Video
- 1Sign in (free)
Create a SoonMaker account in one click with Google. You'll get free credits immediately — no card required.
- 2Upload a photo or describe the shot
Most video tools start from a still image — drop one in and it becomes the first frame. For text-to-video, just describe the scene, the motion, and the camera move.
- 3Pick a model and render
Choose from 16 video models depending on what matters: Veo 3.1 for synced audio, Kling 3.0 for stylised motion, Seedance 2.0 for commercial polish. Hit Generate and download the clip.