Kling 4.0 Text to Video: 30-Second Scenes from a Prompt
Last verified: October 29, 2026
Kling 4.0 generates up to 30 seconds of video in a single pass. That means a written scene can play out as one long take, with its setup, action and payoff in a single clip. To use it, describe the full scene in the Prompt box and set Video Duration toward the long end when the story needs time. Switch Aspect Ratio to 21:9 when the shot calls for an ultrawide, cinema-style frame.
A longer clip gives the story more room to develop, but it also takes more control over what happens, when it happens and how each moment connects. Kling 4.0 pairs its long generations with improved prompt understanding, which gives creators control over narrative progression, pacing and camera direction. So write a prompt for a long clip as a series of moments in order, not as a description of one image.
In text-to-video the prompt is the whole brief. Describe the people, objects, setting and movement you want to see, then add camera directions and lighting. The controls set the length, sharpness and shape of the frame. Everything else comes from your words.
Explore more text to video
Kling 4.0 Settings at a Glance
What you can enter, choose and get back from each text-to-video run in this generator.
Input
A text prompt of up to 5,000 characters
Video Duration
3 to 30 seconds
Resolution
720P or 1080P
Aspect Ratio
16:9, 9:16, 1:1, 21:9
Output
1 video per run
Prompt Techniques for Better Kling 4.0 Results
Build the Prompt in Kling's Recommended Order
Write Camera Moves as Explicit Directions
How to Generate a Video with Kling 4.0
Four steps take you from a written scene to a downloaded clip.
Write the Scene in the Prompt Box
Type your scene into the "Prompt" box. It accepts up to 5,000 characters, which is room for a full brief with the action in order. Start with the subject and what it does, then add the setting, camera and lighting. If you only have a rough idea, click "Enhance Prompt" under the box to see fuller versions. Your text changes only when you pick a suggestion, so you can try it without losing your draft.
Choose Video Duration, Resolution and Aspect Ratio
In "Video Duration", pick a length from 3 to 30 seconds in one-second steps (5 is the default). Size it to the prompt so the action fills the clip: one gesture suits a short clip, while a series of beats needs the longer end. "Resolution" offers 720P (the default) and 1080P. Test motion and framing at 720P and keep 1080P for the version you deliver. "Aspect Ratio" starts at 16:9 and also offers 9:16, 1:1 and 21:9. Choose it before you generate so you write the scene for that frame from the start.
Click Generate
Click "Generate" to send your prompt and settings to Kling 4.0. Each run returns one video. Before you click, check that the prompt and the frame agree: a vertical clip and a prompt built around a wide horizontal pan work against each other.
Download the Result
Watch the whole clip before you download it. Check that the actions happen in the order you wrote, the camera does what you asked and any on-screen text is legible. If one element is off, change only that part of the prompt or a single setting and generate again, so you can tell what made the difference.
Fixing Common Kling 4.0 Problems
What usually goes wrong when a video comes from a prompt alone, and how to correct it.
My video cuts to different shots when I wanted one continuous take
I need a video longer than 30 seconds
Text on signs or packaging comes out misspelled or garbled
My character looks different every time I generate
Frequently Asked Questions
Can I write a long, detailed prompt for Kling 4.0?
Yes, and it helps with longer clips. Kling 4.0 supports long prompts, with room to describe actions, camera movement, scene changes and pacing across a whole scene. The Prompt box has its own character limit, shown in the first step above. Spend those characters on the order of events and the camera path, not on piles of style adjectives.
Which aspect ratio should I pick for a Kling 4.0 video?
Choose by where the clip will play: landscape for YouTube, websites and presentations, vertical for Reels, TikTok and Shorts, and square for feed posts. The ultrawide option suits trailers, title sequences and wide landscapes, and Kling presents that format as part of its push toward polished, production-ready output. Pick the frame before you write camera moves, because a pan across a skyline looks very different in a vertical frame than in an ultrawide one.
What makes one Kling 4.0 generation cost more than another?
The credit cost of a run is calculated from the options you choose and appears above the Generate button once you are signed in. Two settings affect it: Video Duration and Resolution, so changing either one changes the cost of that run. Getting prompt suggestions from Enhance Prompt does not use credits.
Why did Kling 4.0 add things I didn't write in my prompt?
Kling 4.0 can expand and refine the instructions it receives, taking an idea further than the prompt spells out. A short or open prompt leaves it room to add things. When something doesn't belong, describe the scene more fully, say clearly what should stay as written, and generate again.
Can I get several versions of the same prompt at once?
Each run returns a single video. To compare takes, generate again with the same prompt and settings. You can also change one element at a time (the camera move, the lighting or the duration) to see which change improved the clip.