Kling 4.0 Flash Video Generator
Describe a scene or upload a photo, and Kling 4.0 Flash Video Generator renders up to 30 seconds of 4K footage with synced multilingual voices.
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How the Kling 4.0 Flash Video Generator Stands Apart
Feed the panel a written brief or a still image, and the engine produces anything from three seconds to half a minute, with dialogue that tracks the on-screen action in any language.
- Built by Kuaishou on the Kling Video LineThis generation engine comes from Kuaishou and accepts written briefs, stills or reference footage as its starting point, following the earlier Kling 3.0 and Turbo releases.
- One Run, Three Seconds to Thirty, at 720p, 1080p or 4KA single submission yields a clip anywhere between three and thirty seconds, output at up to 4K and guided by up to ten keyframes alongside fifteen Omni Reference entries.
- One Reference Pool for Both Picture and VoiceVisual assets and audio samples share a single intake, which means spoken lines in any language stay matched to the movement happening in frame.
Three Steps Inside the Kling 4.0 Flash Video Generator
Add your assets, describe the shot, and review the first pass before extending the scene.
What You Get from the Kling 4.0 Flash Video Generator
Half-minute scenes, a single shared allowance for reference assets, and speech that tracks the visuals.
Clips of Up to 30 Seconds
One submission holds a complete beat — the opening, the action and the resolution. If a story demands more time, use the continuation route rather than squeezing the concept.
Output Resolution Up to 4K
Choose 720p, 1080p or 4K and match the aspect ratio to where it will run — 21:9, 16:9, 1:1, 9:16 or Auto, covering vertical social edits through to widescreen product reels.
Fifteen Reference Assets in Total
Stills, video, audio and subject pieces all come out of the same allowance of fifteen. Inside that limit sit up to ten images, five clips totalling thirty seconds, or seven subject entries.
Voices and Audio in Multiple Languages
Assign a sample to every speaker and the finished file comes back in two-channel stereo, with the spoken words aligned to the picture regardless of language.
Ten Keyframes Under Your Control
Pin down the beats that count — an expression shifting, a scene turning, the opening and closing frame — using as many as ten stills over a three-to-thirty-second clip.
Precise Editing on Existing Footage
Submit up to five clips, naming one as primary, to adjust a face, a movement, a setting or a style. Each runs three to thirty seconds and the combined length must remain under thirty.
Common Questions on the Kling 4.0 Flash Video Generator
What the engine supports, how the various input limits relate, and what is worth checking before you press generate.
What is the maximum length of a single generation?
One submission spans three to thirty seconds. Longer sequences are handled by the continuation feature, so treat an extended sequence as several runs rather than a single one.
In what way do the reference limits combine?
Fifteen assets form the overall cap. Images max out at ten, video at five clips summing to thirty seconds, subject items at seven — and every one of those draws from the same fifteen, not on top of it.
Will a voice reference support dialogue in another language?
Yes. A sample shapes how a subject sounds, takes up one of the fifteen slots, and works with cross-language lip-sync and audio alignment. Watch the output back to confirm each line lands where intended.
Can existing footage be edited?
It can. You may supply as many as five clips, with one marked primary, and each must fall between three and thirty seconds. Combined, they cannot exceed the thirty-second total.
What number of keyframe images is allowed?
Ten at the most. Place them on the moments that matter — a stance, a scene transition, a shift in expression — and keep the subject and lighting consistent across frames.
Where is the credit cost displayed?
This tool draws on the Kling Motion Control credits sitting in your account. The number is shown on the Generate button and updates whenever you adjust a setting, so check it before confirming.
Start Creating with the Kling 4.0 Flash Video Generator
Open the panel above, load your assets, and review the credit cost and terms displayed before downloading your final video.