Kling 4.0 Flash Video Generator
Build clips of 3 to 30 seconds in up to 4K from a written scene or photo. The Kling 4.0 Flash Video Generator matches every voice to the action.
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Where the Kling 4.0 Flash Video Generator Stands Out
Start from a written brief or a still image, and the model delivers anything from three seconds to half a minute with audio that follows the action in every language.
- Made by Kuaishou: The Kling 4.0 LineageA generation engine from Kuaishou that accepts written prompts, still images and reference material — the successor to Kling 3.0 and Kling 3.0 Turbo.
- One Run, Three Seconds to Thirty, Up to 4KEvery pass lands between three seconds and half a minute, delivered at 720p, 1080p or 4K, with room for 10 keyframes and 15 Omni Reference inputs.
- One Workflow for Pictures and VoicesVisual material and spoken material share a single workspace, so dialogue in any language lands in time with what the frame is doing.
Three Steps with the Kling 4.0 Flash Video Generator
Bring in your references, describe the moment you want, then review the first pass before extending the story.
Core Strengths of the Kling 4.0 Flash Video Generator
Half-minute scenes, a single pool of reference assets, and spoken lines that land exactly where the picture does.
Scenes That Run to 30 Seconds
One run can hold a whole beat — setup, main action and payoff. When the story needs more room, extend it instead of squeezing the idea into a shorter cut.
Output Up to 4K
Choose 720p, 1080p or 4K and frame for where it will play: 21:9, 16:9, 1:1, 9:16 or Auto, from a vertical social cut to a wide product reel.
15 Reference Assets to Draw On
Pictures, footage, voices and subject elements share one ceiling of 15 — 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 speech locked to the moving image whatever the language.
Pin Down 10 Keyframes
Anchor the moments that matter — a change of expression, a turn in the action, the opening and closing frame — using up to 10 stills across a 3–30-second run.
Surgical Edits on Existing Footage
Bring in up to 5 clips, one flagged as primary, to rework a face, a gesture, a backdrop or a look. Each runs 3–30 seconds and the total stays under 30.
Kling 4.0 Flash Video Generator: Common Questions Answered
What the model can do, how the input limits add up, and what to check before you spend credits on a render.
How long can a single Kling 4.0 Flash Video Generator run last?
One pass covers anywhere from three seconds to thirty. Beyond that you move into the extension flow, so check which continuation options your plan includes rather than treating an extended piece as a single render.
How do the reference limits add up?
Fifteen inputs is the overall ceiling. Stills top out at 10, footage at 5 clips totalling 30 seconds, subject elements at 7 — and each category counts against the same 15 rather than stacking on top.
Can a voice reference handle dialogue in other languages?
It can. A voice sample shapes how a subject sounds, takes one of the fifteen slots, and works with cross-language lip and audio matching. Play the clip back to check where each line lands.
Can I edit footage I already own?
Yes. Up to 5 clips go in, one designated primary, and each must sit between three and thirty seconds. Added together they have to stay inside the thirty-second total.
How many keyframes can I place?
Ten at most. Use them to mark the beats you care about — a pose, a shift in the scene, a change of expression — and keep the subject and lighting consistent from frame to frame.
Where can I see the credit cost?
The generator here draws on the Kling Motion Control credits already in your account. The number shows on the Generate button and updates as you change settings, so read it before you commit.
Your Next Scene Starts With the Kling 4.0 Flash Video Generator
Open the panel above, drop in your references and check the credit cost and usage terms before you export the finished file.