Kling 4.0 Image to Video

Kling 4.0 Image to Video

What is Kling 4.0 Image to Video?

Kling 4.0 Image to Video is Kuaishou's next-generation image-to-video model. Give it a single starting frame (and, optionally, an ending frame) plus a short prompt, and it animates that still into a 3 to 30 second clip at 720p or 1080p, with native stereo audio generated in the same pass. Kling 4.0's headline upgrade is Stable Dynamic Motions: high-speed action, continuous body movement, tracking shots and orbiting cameras stay structurally stable instead of warping or drifting, which is exactly where earlier AI video broke down.

Key Features

• •First-and-last-frame control — start on one image, optionally resolve onto another, and Kling animates the motion between them.
• •Stable Dynamic Motions — holds subject structure through fast, continuous movement and complex camera moves.
• •Native single-pass generation from 3 to 30 seconds — long takes with no stitching.
• •Two-channel stereo native audio with more accurate lip sync, produced alongside the video.
• •720p or 1080p output — the aspect ratio follows your input frame, so there is no separate aspect control.

Best Use Cases

Kling 4.0 Image to Video is strongest when your frame contains something that will obviously move — a dancer, an athlete, a vehicle, a flag, a crowd. In testing, a still of a breakdancer frozen mid-windmill animated into a continuous, physically stable spin while the camera orbited and native stereo audio carried the scene. That makes it a fit for social and sports clips, music and dance performance, product-in-motion shots, and short narrative beats where a first-and-last frame defines a clear transition. Because audio is generated in the same pass, it also suits clips that want synchronized ambience or performance sound without a separate step.

Prompt Tips and Output Quality

Pick a sharp, well-composed first frame whose subject is clearly separated and already implies motion. Then describe the motion, the camera move and the sound — not the scene the frame already shows (Kling's own image-to-video rule). Keep to one clear action and name the camera move, for example "the camera orbits low and keeps pace." Use 5 to 10 seconds for most clips and 1080p for hero shots. Review outputs for invented details, since the model can add elements not present in the source.

How to Use Kling 4.0 Image to Video

Kling 4.0 Image to Video turns a single image into a short, moving clip with sound. The result is decided mostly by the frame you start from and how you describe the motion.

Start with the right frame

Upload a sharp first frame (JPG or PNG, at least 300x300 px, up to 30 MB) whose subject is clearly separated from the background and already suggests movement — a dancer mid-pose, a runner mid-stride, a vehicle angled to pull away. The output's aspect ratio follows this frame, so compose it the way you want the video framed. There is no separate aspect-ratio setting.

Describe motion, not the picture

The prompt is optional, but a focused one improves control. Describe what moves, the camera move, and the sound — not the scene the frame already shows. Keep to one clear action and name the camera move explicitly (for example, "the camera orbits low and keeps pace with the spin"). Short, specific prompts beat long walls of adjectives.

End on a second frame (optional)

Add a last frame when you want a defined transition. Kling animates the motion between the two keyframes, which is useful for before-and-after beats or a controlled reveal.

Recommended Settings

• •Duration: 5 to 10 seconds for most clips; reserve longer takes (up to 30s) for sustained action. The default example was tested at 5 seconds for a continuous dance move.
• •Resolution: 1080p for final and hero clips; 720p for faster drafts. The tested default example used 1080p and produced a clean 1920x1076, 24 fps clip with two-channel stereo audio.
• •Audio: generated natively in the same pass — no separate step needed.

Review each clip before publishing, since the model can introduce small details not present in the source.

Examples to try

Each example below ran end to end at the exact settings shown; clicking a card loads its prompt and inputs into the form. Notice how framing follows the first frame, motion and camera come from the prompt, and audio is generated in the same pass.

• •Stable dynamic motion (default example). Prompt: "The breakdancer powers into a continuous windmill: his legs scissor in fast wide circles as his body spins flat across the paving stones, one hand then the other slapping down to keep the rotation going. The camera orbits low around him and keeps pace with the spin, hard midday light sweeping his sharp shadow across the ground. Scuffing sneakers, slapping palms and open-air city ambience." The windmill stays coherent through a full rotation as the camera orbits. Tip: start from a frame that already implies the motion.
• •First-and-last-frame control. Prompt: "The closed bud splits and unfurls into a full open bloom, petals curling outward layer by layer, a water droplet trembling then sliding off a petal edge; the camera eases in a touch on the opening flower. A faint rustle of petals and quiet room tone." With a last frame added, the clip ends exactly on it and animates the transition between. Tip: give both frames the same subject, framing and light.
• •Spoken dialogue with lip-sync. Prompt: "The baker glances up from the loaves, breaks into a grin and says in English, 'Fresh out of the oven, come and try one.' The camera holds a tight head-and-shoulders shot as he gestures to the bread. His voice sits forward in clean stereo over the hum of the oven and the crackle of cooling crust." Mouth movement matches the line in native stereo. Tip: use a sharp frontal portrait and quote the exact words.
• •Long single-pass take (10s). Prompt: "Dust drifts in the shafts of light as a steady forward dolly travels the length of the hall, carved shelves and arched ribs sliding past on both sides, the red runner unrolling toward a bright window at the far end, one continuous unbroken take. Quiet library ambience, faint creak of old wood." One unbroken 10-second move; structure holds the whole way. Tip: raise duration and name one continuous camera move.

More to try, as short motion instructions: "a horse breaks into a gallop as the camera tracks alongside", "a chef plates a dish and looks up to speak", "a paper lantern lifts off and drifts upward".

Does it need a text prompt?

No — the first frame is required; the prompt is optional but sharpens the motion.

Can I control where the clip ends?

Yes — add an optional last frame and Kling animates the motion between the two.

How long can a clip be?

Any length from 3 to 30 seconds, generated in a single pass.

What resolutions are supported?

720p or 1080p; the output aspect ratio follows your input frame.

Does it produce sound?

Yes — native two-channel stereo audio is generated together with the video.