AI Music Generator: Original Music and SFX Fitted to Your Clip
Stock music has two problems: it is recognisable, and it never quite fits the length of the cut. Generated music solves both, and it costs less than a licence.
Most short video uses one of a few hundred stock tracks, which is why so much of it sounds the same. The other half of the problem is structural: a track is thirty seconds and the cut is nineteen, so something gets faded out awkwardly.
OpenFilmo generates music and sound effects against the length of your clip, so the score ends where the video ends. Because it is generated rather than licensed, it comes with commercial use rather than a per-use fee.
What it does
Built for this specific job, not a generic generator.
Fitted to the cut
Music is generated against the length of your clip, so it ends with the video instead of fading mid-beat.
Original, not stock
Generated tracks are not the same loops every other video is using.
Sound effects too
Generate foley and ambience — room tone, impacts, transitions — alongside the score.
Cleared for commercial use
Generated audio carries commercial use rights, avoiding per-use licensing on stock libraries.
How it works
Four steps, no timeline to learn.
Decide the job of the music
Is it carrying the pace, or sitting under narration? Music under voice needs to be far quieter and simpler than music carrying a montage.
Generate against the length
Set the clip length so the score is built to fit rather than trimmed to fit.
Add sound design where it counts
A transition or impact at the right moment does more than a fuller mix.
Check levels before export
Listen with the narration in. Music that sounds right alone is usually too loud under a voice.
What people make with it
The jobs this actually gets used for.
Ads and promos
A score built to the length of the spot, with no awkward fade.
Channel intros
One short theme reused across every upload, which makes a channel recognisable in two seconds.
Social cuts
Music and SFX for Reels and Shorts, generated to the exact length.
Explainer and training
A bed that sits under narration without competing with it.
Why generated audio beats stock for short video
The licence is the smaller half of the argument. The fit is the bigger one.
Stock libraries charge per use and per platform, which quietly makes short-form production expensive when volume is the whole point. Generated audio removes that line item entirely.
The bigger win is structural. A track written to nineteen seconds does not need a fade, a loop or a cut, and it lands its final beat on the last frame — which is a difference viewers feel even if they never identify it.
The craft constraint is volume. Music under narration should sit well below the voice; music carrying a montage can sit forward. Check the mix with the narration in, not on its own.
Credits and plans
Generation is metered in credits, shared across every tool.
A five-second video costs 5 credits and one image costs 2. The Free plan gives you 30 credits every month with no credit card, no watermark and commercial use included. Paid plans start at $9 for 400 credits and add faster generation, parallel tasks and higher export resolution.
Related guides
Longer reads on the same workflow, from the OpenFilmo blog.
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Related workflows
Closely related tools and guides on the same problem.
Frequently asked questions
Can I use the music commercially?
Yes. Generated audio carries commercial use rights, so there is no per-use licence the way stock libraries charge.
Is the music fitted to my clip length?
Yes. The score is generated against the length of your video, so it ends with the cut instead of being trimmed or faded.
Can I generate sound effects as well?
Yes — impacts, transitions, room tone and ambience beds alongside the score.
How loud should the music be under narration?
Well below the voice. Check the mix with the narration in place rather than listening to the music alone, which is the usual cause of an over-loud bed.
How much does it cost?
Music and SFX draw from the same credit balance as generation. The Free plan gives 30 credits per month with no credit card.
Will my track sound like everyone else’s?
No. It is generated rather than pulled from a shared library, so it is not one of the few hundred tracks that dominate stock usage.
Can I reuse one theme across videos?
Yes, and it is worth doing — a consistent short intro theme makes a channel recognisable within a couple of seconds.
Does it work with captions and voiceover?
Yes. Music, voiceover and captions all run in the same workspace against one credit balance.
Video prompt collections
Copy-ready prompt sets for text-to-video, image-to-video, product, UGC, social and tutorial clips.