Kling 4.0 Flash Video Generator
A text brief or a single still is all it takes — the Kling 4.0 Flash Video Generator returns 30 seconds of 4K video with 15 references and multilingual audio.
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Key Strengths of the Kling 4.0 Flash Video Generator
Feed it a written idea or a still image and it returns three to thirty seconds of footage, with speech and motion kept in sync across languages.
- The Kling 4.0 Engine, Built by KuaishouDeveloped by Kuaishou, this engine accepts written prompts, stills and reference clips, and follows the earlier Kling 3.0 and Kling 3.0 Turbo releases.
- One Run, Three to Thirty Seconds, Up to 4KA single run spans three seconds to half a minute and outputs at 720p, 1080p or 4K, guided by up to ten keyframes and fifteen Omni Reference inputs.
- One Omni Reference Flow for Picture and VoiceOmni Reference holds visual assets and voice samples in the same pipeline, which lets dialogue in any language match the action on screen.
How to Use the Kling 4.0 Flash Video Generator
Add your references, describe the shot, then review the first cut 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 visuals.
Clips Up to 30 Seconds Long
One pass holds a complete beat — the setup, the key action and the resolution. If the story runs longer, extend it rather than squeezing the idea.
Output as High as 4K
Choose 720p, 1080p or 4K and match the frame to the platform — 21:9, 16:9, 1:1, 9:16 or Auto, whether it's a vertical social clip or a wide product shot.
As Many as 15 Reference Inputs
Stills, footage, voices and subject items all come out of one pool of fifteen. Inside that cap you may use up to ten stills, five clips totalling 30 seconds, or seven subject elements.
Voice References and Multilingual Audio
Assign a voice sample to every speaker and the result comes back in two-channel stereo, with the spoken lines matched to the picture in any language.
Steer with as Many as 10 Keyframes
Pin the beats that count — a shift in expression, a turn in the story, the opening and closing frame — using up to ten stills over a three-to-thirty-second run.
Focused Video Editing
Bring in up to five clips, one marked as primary, to rework a face, a gesture, a background or a style. Each clip lasts 3–30 seconds and the sum stays below thirty.
Common Questions About the Kling 4.0 Flash Video Generator
What the model can do, how the input limits add up, and what to check before you start a render.
How long can a single Kling 4.0 render be?
One pass spans three to thirty seconds. Anything longer falls to the extension flow, so check the continuation options available rather than treating an extended piece as a single run.
How are the reference limits counted?
Fifteen inputs is the overall cap. Stills max out at ten, footage at five clips summing to 30 seconds, subject items at seven — and those numbers all come out of the same fifteen rather than adding on top.
Do voice references support dialogue in other languages?
Yes. A voice sample shapes how a subject sounds, takes up 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 footage I already own?
Yes. You can add up to five clips, one named primary, and each must fall between three and thirty seconds. Combined, they have to remain within the thirty-second total.
What is the keyframe image limit?
Ten. Use them to flag the moments that matter — a pose, a turn in the scene, a change of expression — and keep the subject and lighting consistent from one frame to the next.
Where is the credit cost shown?
The tool draws on the Kling Motion Control credits already in your account. The amount shows on the Generate button and updates as you adjust settings, so check it before you commit.
Start Your First Clip with the Kling 4.0 Flash Video Generator
Open the panel above, attach your references, and review the credit cost and terms displayed before you export the finished clip.