Kling 4.0 Flash Video Generator
Generate video from text or a single photo with this Kling 4.0 Flash Video Generator — 3–30 second clips up to 4K, with voices matched across languages.
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Key Strengths of the Kling 4.0 Flash Video Generator
Start with a written idea or a still image; this engine produces clips between three and thirty seconds and holds speech and motion together no matter the language.
- Built by Kuaishou, Arriving After Kling 3.0The engine comes from Kuaishou and follows Kling 3.0 and Kling 3.0 Turbo, taking written briefs, photographs and reference assets as its starting point.
- One Run, Three to Thirty Seconds, 720p to 4KA single request yields clips anywhere between three and thirty seconds long, delivered at 720p, 1080p or 4K and guided by up to ten keyframes and fifteen reference inputs.
- One Omni Reference Flow for Images and VoicesVisual assets and audio samples share the same pipeline, which means spoken lines in any language stay aligned with the action on screen.
Three Steps to Your First Clip
Bring in your assets, describe what you want, and review the first pass before extending the story.
Everything the Kling 4.0 Flash Video Generator Can Do
Scenes of up to half a minute, a single shared budget of reference inputs, and speech that tracks the visuals.
Clips of Up to 30 Seconds
One pass fits an entire story beat — setup, action and resolution. If more time is required, extend the scene rather than squeezing the idea into fewer seconds.
Output as High as 4K
Choose 720p, 1080p or 4K, then match the frame to where it will run: 21:9, 16:9, 1:1, 9:16 or Auto — a tall social post or a broad product reel.
As Many as 15 Reference Assets
Stills, video, voice and subject inputs all come out of a common limit of fifteen — which allows ten images, five clips totalling thirty seconds, or seven subject items.
Voices and Audio in Many Languages
Assign a voice clip to every speaker, and the result comes back in two-channel stereo with speech locked to the picture regardless of language.
Pin Down as Many as 10 Keyframes
Lock the beats that count — an expression shift, a turn in the action, the opening and closing frames — using up to ten images across a three-to-thirty-second clip.
Precise Clip-Level Editing
Supply up to five clips, designating one as the primary, to adjust a face, a movement, a setting or a colour look. Each runs three to thirty seconds and the sum must not exceed thirty.
Kling 4.0 Flash Video Generator: Common Questions
What the engine can do, how the various input limits interact, and what to check before you start a render.
What is the maximum length of a single render?
One job spans three to thirty seconds. Longer material comes from extending a finished clip, so check the continuation feature on your plan instead of expecting a single pass to cover it.
How are the reference input limits counted?
Everything shares one pool of fifteen. Images max out at ten, video at five clips totalling thirty seconds, subject items at seven — and each category draws from the same fifteen rather than adding to it.
Will voice samples work for dialogue in other languages?
Yes. A voice clip shapes how a subject sounds, uses one of the fifteen slots, and works together with cross-language lip and audio alignment. Review the output to confirm each line lands where you intended.
Can I edit existing video footage with this tool?
It can. You may upload as many as five clips, mark one as primary, and keep each between three and thirty seconds — the combined length must remain under thirty.
What is the keyframe image limit?
No more than ten. Place them at the moments that matter — a pose, a scene transition, an expression change — and keep the subject and lighting consistent between frames.
How do I find out the credit cost?
Rendering here consumes the Kling Motion Control credits held in your account. The amount is displayed on the Generate button and updates as settings change, so check it before confirming.
Ready to Create with the Kling 4.0 Flash Video Generator?
Head to the panel above, upload your assets, and review the credit cost and terms displayed before you download the final video.