Kling 4.0 Flash Video Generator
Give the Kling 4.0 Flash Video Generator a written brief or a photo and it returns up to half a minute of 4K footage with voices in sync.
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A Closer Look at the Kling 4.0 Flash Video Generator
Every clip starts from your own words or images, runs three to thirty seconds, and keeps speech aligned with what happens on screen in any language.
- The Kling 4.0 Model, ExplainedKuaishou built this engine to read written prompts, still photos and reference material — it follows on from the earlier Kling 3.0 and Kling 3.0 Turbo releases.
- One Run, Three Seconds to Thirty, Up to 4KAsk once and you get a clip of any length between three and thirty seconds at 720p, 1080p or 4K, guided by as many as ten keyframes and fifteen reference inputs.
- One Workflow for Pictures and VoicesVisual material and spoken lines share the same pipeline, which keeps dialogue in any language matched to the action on screen.
Three Steps with the Kling 4.0 Flash Video Generator
Add your source material, describe the shot you want, and review the first draft before extending the scene.
Core Capabilities of the Kling 4.0 Flash Video Generator
Half-minute scenes, a single shared budget of reference inputs, and speech that tracks the on-screen action.
Clips That Run as Long as 30 Seconds
One run holds a complete beat — the setup, the action and the payoff. If the story needs more room, keep going through the extension flow rather than cutting the idea down.
Output Resolution Up to 4K
Resolution tops out at 4K, with 720p and 1080p also on offer. Ratios cover 21:9, 16:9, 1:1, 9:16 and Auto, so a tall social cut and a widescreen product reel both work.
Fifteen Reference Inputs in One Budget
Stills, video, voice samples and subject elements all come out of the same pool of fifteen — no more than ten photos, five clips totalling thirty seconds, or seven subject elements at once.
Voices and Audio Across Languages
Hand each speaker a voice sample and the finished clip comes back in two-channel stereo, with the words aligned to the moving picture whatever the language.
Pin Down as Many as 10 Keyframes
Mark the beats that count — an expression shifting, a turn in the story, the opening and closing frames — using as many as ten stills spread across a three-to-thirty-second clip.
Edit Specific Parts of Existing Footage
Bring in up to five clips, one flagged as primary, to rework a face, a gesture, a background or a grade. Each runs three to thirty seconds and together they cannot pass thirty.
Answers to Common Questions About the Kling 4.0 Flash Video Generator
Which jobs this model takes on, how the input caps combine, and what is worth checking before you press generate.
What is the longest clip a single run produces?
One pass spans three to thirty seconds. Longer material comes from the extension flow, so check what continuation options your service provides instead of treating an extended piece as a single run.
What are the limits on reference inputs?
Fifteen is the overall cap. Within it, photos max out at ten, footage at five clips totalling thirty seconds, and subject elements at seven — these are slices of the same fifteen, not additions on top.
Do voice samples work across languages?
Yes. A sample shapes how a subject sounds, uses one of the fifteen slots, and works with cross-language lip and audio matching. Play it back to confirm where each line lands.
Can it rework video I already own?
It can. Five clips can be loaded, one marked primary, each lasting between three and thirty seconds, and their combined length cannot exceed thirty.
How many keyframes am I allowed to set?
Ten, at the most. Use them for the beats that matter — a pose, a scene change, a shift in expression — and keep the subject and the lighting consistent from frame to frame.
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 updates as you adjust settings, so read it before committing.
Let the Kling 4.0 Flash Video Generator Handle Your Next Scene
Head to the panel above, load your references, and check the credit cost and usage terms displayed before you export the final clip.