Kling 4.0 Flash Video Generator
Feed the Kling 4.0 Flash Video Generator a written brief or a photo and receive a 4K clip of up to 30 seconds, complete with synced stereo voices.
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Meet the Kling 4.0 Flash Video Generator Built by Kuaishou
Hand it a written idea or a still image and it returns three to thirty seconds of footage, with spoken lines matched to the action in any language.
- Born in Kuaishou's Own Video LabKuaishou's generation engine accepts written briefs, photographs and reference clips, and arrives in the line that follows Kling 3.0 and Kling 3.0 Turbo.
- One Pass, Three Seconds to Thirty, Up to 4KA single run covers three seconds through half a minute at 720p, 1080p or 4K, guided by as many as ten keyframes and fifteen Omni Reference slots.
- Omni Reference Holds Pictures and Voices TogetherVisual assets and voice samples share one workspace, which lets dialogue in any language land in step with whatever happens on screen.
How to Run the Kling 4.0 Flash Video Generator
Bring your assets in, describe the moment you want, and review the first result before extending the story.
Core Capabilities of the Kling 4.0 Flash Video Generator
Half-minute sequences, a single reference budget to spend, and speech that never drifts away from the visuals.
Sequences That Reach Thirty Seconds
One pass holds a complete beat — the opening, the turn and the payoff. If your story runs past that, carry it forward through the extension flow rather than squeezing the idea.
Output That Climbs to 4K
Choose 720p, 1080p or 4K and match the frame to where it will play — 21:9, 16:9, 1:1, 9:16 or Auto, whether that means a vertical feed or a widescreen showcase.
A Reference Budget of Fifteen
Stills, footage, voices and character elements all come out of the same pool of fifteen. Spend it as up to ten images, five clips totalling thirty seconds, or seven character elements.
Voices That Travel Across Languages
Assign a voice sample to every speaker and the render comes back in two-channel stereo, with lip movement and audio aligned whatever the language.
Ten Keyframes to Anchor the Action
Pin the beats that carry weight — an expression shifting, the scene turning, the opening and closing frames — using as many as ten stills across a three-to-thirty-second clip.
Surgical Edits on Footage You Already Own
Bring in up to five clips, naming one as the lead, to rework a face, a gesture, a backdrop or a colour treatment. Each clip lasts three to thirty seconds and the combined length stays inside thirty.
Frequently Asked Questions About Kling 4.0 Flash
The ground this model covers, the way the input limits add up, and what to double-check before you hit generate.
What is the longest single Kling 4.0 render?
One run spans three to thirty seconds. Anything longer goes through the extension flow, so check what continuation options your service provides instead of treating an extended piece as a single pass.
How are the reference limits counted?
The overall ceiling is fifteen inputs. Images max out at ten, footage at five clips totalling thirty seconds, character elements at seven — and each of those comes out of the same fifteen rather than adding on top of it.
Will a voice reference handle dialogue in another language?
Yes. A voice sample shapes how a character sounds, takes up one of the fifteen slots, and works alongside cross-language lip-sync and audio alignment. Watch the render back to confirm each line lands where you want it.
Can I rework footage I already own?
You can. Five clips may be submitted, with one marked as the lead, and each must fall between three and thirty seconds. Their combined running time has to stay under thirty.
What is the keyframe image limit?
Ten is the maximum. Spend them on the moments that matter — a stance, a scene change, a different expression — and keep the subject and the lighting consistent from frame to frame.
Where can I check the credit cost?
This tool draws on the Kling Motion Control credits sitting in your account. The number shows on the Generate button and updates as your settings change, so read it before committing.
Start Building with the Kling 4.0 Flash Video Generator
Head to the panel above, load your assets, and check the credit estimate plus usage terms on screen before you download the finished file.