Kling 4.0 Flash Video Generator
Prompt, upload, generate: the Kling 4.0 Flash Video Generator builds 4K scenes of 3–30 seconds, aligning 15 reference inputs and voices across languages.
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What Sets the Kling 4.0 Flash Video Generator Apart
Start from a sentence, a still or a voice clip, and the Kling 4.0 Flash Video Generator keeps dialogue locked to the picture in any language.
- The Kling 4.0 Model, Built by KuaishouKuaishou's follow-up to Kling 3.0 and 3.0 Turbo takes written briefs, still photos and reference footage as its starting point.
- One Pass, 3–30 Seconds, 720p Through 4KA single run spans three seconds to thirty at your chosen resolution, shaped by up to 10 keyframes and 15 Omni Reference slots.
- One Omni Reference Flow for Pictures and VoicesVisual assets and audio samples share a single pipeline, which is how spoken lines stay matched to the action on screen across languages.
How the Kling 4.0 Flash Video Generator Works, Step by Step
Bring in your assets, describe the action, and review the first cut before extending the story.
What You Can Build with the Kling 4.0 Flash Video Generator
Long takes, a shared budget of reference inputs, and audio that never drifts away from the picture.
Clips Up to 30 Seconds Long
One run holds a complete beat — the setup, the action and the payoff. If the idea needs more room, carry it forward with the extension flow rather than squeezing it into a single pass.
Output Up to 4K
Choose 720p, 1080p or 4K, then match the frame to where it will live: 21:9, 16:9, 1:1, 9:16 or Auto, whether that's a vertical feed or a wide presentation.
15 Reference Assets in Total
Photos, footage, voices and subject elements all come out of the same allowance of 15. Inside that number you might use 10 stills, 5 clips totalling 30 seconds, or 7 subject elements.
Voices That Work Across Languages
Supply a sample for every speaker and the finished file returns in two-channel stereo, with each line fitted to the on-screen action whatever the language.
Steer the Scene with 10 Keyframes
Pin the beats that carry the story — an expression shifting, a turn in the action, the opening and closing frame — using as many as 10 stills across a 3–30-second clip.
Precise Edits to Existing Footage
Load up to 5 clips, naming one as the primary, to rework a face, a gesture, a background or a colour grade. Each clip sits between 3 and 30 seconds and the combined length stays under 30.
Common Questions About the Kling 4.0 Flash Video Generator
What the model can do, how the input limits add up, and what to check before you hit generate.
What is the longest clip a single run can produce?
One pass handles anywhere from three to thirty seconds. Anything longer comes from the extension flow, so check which continuation options your plan includes instead of treating a stretched scene as one generation.
How are the reference limits calculated?
Everything shares one allowance of fifteen. Stills top out at 10, footage at 5 clips within 30 seconds and subject elements at 7 — and each of those draws from the same fifteen rather than adding to it.
Will voice samples work for dialogue in other languages?
Yes. A sample shapes how a subject sounds, uses one of the fifteen slots, and works alongside lip and audio matching across languages. Play the clip back to confirm where each line lands.
Can it rework footage I already own?
It can. You may upload up to 5 clips, one marked as primary, each between three and thirty seconds long — and their combined length has to stay inside thirty seconds.
How many keyframe images are allowed?
No more than ten. Place them at the moments that matter — a pose, a change of expression, a turn in the action — and keep the subject and lighting consistent between them.
How do I know what a generation will cost in credits?
Runs are paid for with the Kling Motion Control credits already sitting in your account. The number shown on the Generate button updates as you adjust settings, so review it before submitting.
Ready to Try the Kling 4.0 Flash Video Generator?
Head back to the panel, load your references, and review the credit cost and terms on display before you download a finished clip.