Kling 4.0 Flash Video Generator
Sketch out a scene in words or start from a still — the Kling 4.0 Flash Video Generator renders 3–30 second clips in up to 4K with dialogue in sync.
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Why Creators Choose the Kling 4.0 Flash Video Generator
Feed it a sentence or a still frame and it returns anything from a three-second beat to a half-minute sequence, with dialogue that matches the action in any language.
- A Kuaishou-Built Engine for AI VideoDeveloped in-house at Kuaishou, this engine reads written briefs, still frames and reference clips — the follow-up to the Kling 3.0 and Kling 3.0 Turbo releases.
- One Run, Three Seconds to Thirty, Up to 4KA single render covers a brief moment or a full half-minute, output at 720p, 1080p or 4K, with up to 10 keyframes and 15 Omni Reference slots guiding the result.
- One Shared Pool for Visuals and VoicesVisual assets and voice samples sit in the same reference pool, which lets spoken lines in any language stay locked to the on-screen action.
How to Use the Kling 4.0 Flash Video Generator in Three Steps
Add your assets, describe the moment, and review the first pass before extending the story.
Inside the Kling 4.0 Flash Video Generator Toolset
Half-minute scenes, a single shared allowance for reference inputs, and speech that tracks the moving image.
Scenes That Run to 30 Seconds
One pass is enough for a complete beat — the setup, the action and the payoff. If the narrative wants more room, keep going with the extension flow rather than squeezing the idea flat.
Output Up to 4K Resolution
Choose 720p, 1080p or 4K, then frame for wherever it lands: 21:9, 16:9, 1:1, 9:16 or Auto, whether that's a phone-first social edit or a widescreen product demo.
A Ceiling of 15 Reference Assets
Stills, video, voices and character elements all come out of the same pool of fifteen. Spend it however you like: ten images, five clips totalling thirty seconds, or seven subject elements.
Voices That Speak Any Language
Assign a sample to every speaker and the finished file comes back in two-channel stereo, with each line aligned to the picture no matter the language.
Steer the Scene with 10 Keyframes
Pin the beats that count — a flicker of expression, a shift in the action, the opening and closing frames — using as many as ten stills over a three-to-thirty-second clip.
Edit Existing Footage Selectively
Upload up to five clips, naming one as the primary, to rework a face, a movement, a setting or a grade. Each runs three to thirty seconds, and the combined length must stay within thirty.
Answers to Common Questions About the Kling 4.0 Flash Video Generator
What the model handles, how the input limits add up, and the details worth checking before you press Generate.
What is the maximum length of a single render?
One pass spans three to thirty seconds. Anything longer is handled by the extension flow, so treat a continued scene as several linked renders rather than a single one — check what continuation options your plan includes.
How are the reference slots counted?
Everything draws from a pool of fifteen. Images top out at ten, video at five clips (thirty seconds combined), subject elements at seven — and those figures come out of the same fifteen rather than adding to it.
Will voice samples work across different languages?
Yes. A sample shapes how a character sounds, takes up one of the fifteen slots, and works alongside cross-language lip-sync and audio matching. Play the clip back to confirm each line sits where you want it.
Can it rework video clips I already own?
It can. You may supply as many as five clips, with one marked as primary; each must fall between three and thirty seconds, and their combined running time cannot exceed thirty.
What number of keyframes is allowed?
Up to ten. Place them at the moments you want held — a pose, a turn in the action, an expression — and keep the subject and the light consistent from one to the next.
Where can I check how many credits a render costs?
Renders are paid for with the Kling Motion Control credits sitting in your account. The amount shows on the Generate button and updates whenever you change a setting, so glance at it before committing.
Turn Your Idea into Video with the Kling 4.0 Flash Video Generator
Head to the panel above, drop in your references and check the credit price on screen before you download the finished clip.