Kling 4.0 Flash Video Generator
Turn a prompt or a photo into a 30-second 4K clip with Kling 4.0 Flash Video Generator — 15 reference assets, 10 keyframes and synced stereo voice.
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Why Creators Choose the Kling 4.0 Flash Video Generator
Start from a written brief or a single still, choose anything between three and thirty seconds, and let dialogue stay locked to the picture in any language.
- A Kuaishou-Built Model, ExplainedKuaishou's next step after Kling 3.0 and Kling 3.0 Turbo: a generator that reads written briefs, still frames and reference media as its starting point.
- One Run, Three to Thirty Seconds, Up to 4KEvery render lands somewhere between three seconds and half a minute, delivered at 720p, 1080p or 4K and guided by up to 10 keyframes with 15 Omni Reference inputs.
- One Workflow for Pictures and VoicesWith Omni Reference, visual assets and recorded speech share a single workspace, which keeps spoken lines in any language matched to the action on screen.
Three Moves to Your First Kling 4.0 Flash Video Generator Clip
Bring in your assets, describe the shot, then review the first pass before extending the scene.
Capabilities Packed Into the Kling 4.0 Flash Video Generator
Half-minute scenes, a single pool of reference inputs, and speech that keeps pace with the image.
Scenes Up to 30 Seconds Long
One pass can hold a complete beat — setup, main action, payoff. If the story needs more room, carry it forward through the extension flow rather than squeezing the idea down.
Output All the Way to 4K
Choose 720p, 1080p or 4K and frame for wherever it lands — 21:9, 16:9, 1:1, 9:16 or Auto, whether that's a vertical social post or a wide product reel.
As Many as 15 Reference Assets
Stills, footage, voice samples and subject elements all pull from the same pool of 15. Inside that limit you can run up to 10 stills, 5 clips totalling 30 seconds, or 7 subject elements.
Voice References in Any Language
Hand each speaker a voice sample and the render comes back in two-channel stereo, with the spoken lines matched to the moving picture no matter the language.
Ten Keyframes to Steer the Action
Pin the moments that carry weight — a shifting expression, a turn in the story, the opening and closing frame — using as many as 10 stills across a 3–30-second render.
Surgical Edits on Existing Footage
Bring in up to 5 clips, one marked as primary, to rework a face, a gesture, a backdrop or a grade. Each clip sits between 3 and 30 seconds and the sum stays under 30.
Answers to Common Kling 4.0 Flash Video Generator Questions
What the model handles, how the input limits add up, and what to check before you hit generate.
What's the maximum length of a single Kling 4.0 run?
One pass spans three to thirty seconds. Anything past that goes through the extension flow, so check which continuation options your service provides instead of treating an extended piece as a single run.
How do the reference caps add up?
Fifteen inputs is the overall ceiling. Stills stop at 10, footage at 5 clips totalling 30 seconds, subject elements at 7 — and each of those numbers is drawn from the same 15 rather than added on top.
Will a voice reference handle dialogue in other languages?
Yes. A voice sample shapes how a subject sounds, takes up one of the fifteen slots, and works alongside cross-language lip and audio matching. Play the render back to confirm where each line lands.
Can it rework footage I already own?
It can. You upload up to 5 clips with one named as primary, each falling between three and thirty seconds, and their combined length has to remain inside the thirty-second total.
How many keyframe stills am I allowed?
Ten, at most. Spend them on the beats that matter — a pose, a scene shift, a change of expression — and keep the subject and lighting consistent from one frame to the next.
Where can I check the credit cost?
This generator draws on the Kling Motion Control credits sitting in your account. The number shows on the Generate button and shifts whenever you adjust a setting, so read it before you commit.
Start Building Clips With the Kling 4.0 Flash Video Generator
Head to the panel above, drop in your references, and review the credit cost and usage terms displayed before you export the finished clip.