Kling 4.0 Flash Video Generator
Craft cinematic clips from a written idea or a photo with Kling 4.0 Flash Video Generator — 30 seconds max, up to 4K, and voices that stay in step.
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A Closer Look at the Kling 4.0 Flash Video Generator
Begin with written direction or a single still frame — the Kling 4.0 Flash Video Generator covers three to thirty seconds and keeps every spoken line matched to the image.
- Built by Kuaishou, Arriving After Kling 3.0The engine comes from Kuaishou and follows earlier Kling releases. Hand it written direction, a still frame or reference material and it constructs the scene from there.
- One Run, Three to Thirty Seconds, 720p to 4KA single submission comes back as anything between three seconds and half a minute, output at 720p, 1080p or 4K, and steered by up to ten keyframes alongside fifteen reference inputs.
- Visual and Voice Inputs Inside One Shared FlowPicture assets and recorded speech sit in the same working space, which means dialogue in any supported language lands in step with the action on screen.
From Idea to Finished Clip in Three Moves
Bring in your assets, describe what should happen, then review the first pass before you carry the story further.
Everything the Kling 4.0 Flash Video Generator Can Do
Half-minute scenes, a single shared pool of reference inputs, and speech that never drifts away from the picture.
Runs That Reach 30 Seconds
One submission can hold a complete beat — the setup, the main action and the resolution. If the narrative needs more space, keep going through the extension route rather than squeezing the idea.
Output All the Way 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 is a vertical social edit or a wide product showcase.
Fifteen Reference Slots in Total
Stills, footage, voices and subject elements all come out of the same allowance of fifteen. Inside that number you may use ten stills, five clips totalling thirty seconds, or seven subject elements.
Speech That Travels Across Languages
Hand each speaker a voice sample and the finished file comes back in two-channel stereo, with the spoken words aligned to the moving image whatever language they are in.
Ten Keyframes Under Your Control
Pin the beats that count — a shift in expression, a turn in the story, the opening and closing frame — using as many as ten stills across a three-to-thirty-second clip.
Reshape Footage You Already Have
Bring in up to five clips, naming one as the primary, to rework a face, a movement, a backdrop or a colour grade. Each runs between three and thirty seconds, and the combined length stays under thirty.
Common Questions, Answered
Input limits, clip length and credit costs for the Kling 4.0 Flash Video Generator — plus what to check before you send a job.
What is the maximum length of a single clip?
Anywhere from three seconds to thirty comes back in one submission. Longer pieces are handled through extension, so treat the continued section as a separate step rather than part of the original run.
How many reference files am I allowed?
Fifteen is the overall allowance. Within it, stills stop at ten, footage at five clips adding up to thirty seconds, and subject elements at seven — the categories share that one pool instead of stacking on top of each other.
Will my characters speak in other languages?
Yes. A recorded voice sample shapes how a subject sounds, takes up one of the fifteen slots, and works with lip and audio matching across languages. Watch the export back to confirm how each line lands.
Can I rework video I have already shot?
You can. Five clips may be uploaded, with one marked as the primary, and each must last between three and thirty seconds. Combined, they still have to fit inside the thirty-second ceiling.
What is the keyframe image limit?
No more than ten. They work well for marking the moments that matter — a pose, a turn in the scene, a change of expression — provided the subject and the lighting stay consistent from frame to frame.
How do I know what a job will cost?
The tool draws on the Kling Motion Control credits already sitting in your account. The amount shows on the Generate button and updates whenever you adjust a setting, so read it before you commit.
Start Rendering with Kling 4.0 Flash Video Generator
Head to the panel above, drop in your reference files, and check the credit figure and usage terms displayed before you download the finished clip.