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  1. Home/
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  3. Kling 4.0 Flash

Kling 4.0 Flash demo

Watch the clip and explore its motion, detail, and camera work.

Watch demo

Before you generate

  • Video prompt examples and the 5-part formula10 ready prompts with real results and tips on camera, light and motion — adapt them and run in Kling 4.0 Flash.
Open Kling 4.0 Flash in the editor

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Kling 4.0 Flash — русская версия

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Kling 4.0 Flash · Clipia

Kling 4.0 Flash fast videos up to 20 seconds with sound

The fast version of Kling 4.0: a 3–20 second clip in 720p together with speech, ambience and music. Shoot a scene from text, animate a photo as the first frame, or build it from images, videos and characters.

Create with Kling 4.0 FlashWatch examples
per clip
3–20 s
resolution
720p
in every generation
sound and speech
In short

What is Kling 4.0 Flash

Kling 4.0 Flash is a Kuaishou video model from the Kling 4.0 family, released by its developer as a faster, better-value version. Clips run from 3 to 20 seconds in 720p, and sound is generated together with the picture. Pick a mode in the editor: from text, from a first frame or from references — images, videos and characters. Flash has no last frame, no 1080p and no standalone voices — those are in Kling 4.0.

3–20 s
clip length
up to 10 images
and up to 5 videos per request
first frame
a photo opens the clip
sound always on
speech, ambience and music
Examples

What Kling 4.0 Flash makes

All clips are real Kling 4.0 Flash generations in 720p with sound, with no editing or added voice-over. The clip at the top of the page comes from text alone: a cyclist on a coastal road at sunset. Below: a photo as the first frame, two image references in one scene and a video restyled as a watercolor.

First frame: a woman laughing at a café table with the Eiffel Tower outside
Reference
First frame → video

Laughter in a Paris café

The first frame is a photo: a woman at a café table with a view of the Eiffel Tower. In three seconds she laughs, lifts her cup and takes a sip while rain runs down the window and the camera slowly pushes in. The café hum and the rain are generated together with the picture.

How to set up the scene
Mark the photo as @first_frame and describe what happens next: the character's action, the camera move and the sounds. The photo itself sets the clip's aspect ratio.
Open this mode
Reference: an old fisherman in a dark sweater against the sea
Reference
Image references → video

A meeting on the pier

Two photos go in: an old fisherman and a red-haired young woman. The model brings them together on a wooden pier at sunset: he hands her a glass fishing float, she holds it up to the light and laughs, and the shot cuts to a close-up. Faces and clothes stay as in the photos.

How to set up the scene
Name each photo's role in the text: "the fisherman from @image_1 and the woman from @image_2 meet on a pier". Describe the action, the light and the sounds — waves and distant gulls.
Open this mode
Source video: a glass hummingbird landing on a perfume bottle on marble
Source video
Video → new look

A hummingbird in watercolor

A finished clip goes in: a glass hummingbird landing on a perfume bottle. Kling 4.0 Flash keeps the source's motion and camera but redraws the whole scene as a watercolor: paper texture, fine ink outlines and soft washes of color.

How to set up the scene
Refer to the clip as @video_1 and describe the new look: "keep the motion and camera of @video_1, but redraw the scene as a watercolor". The length of the source video is also counted in the price.
Open this mode

Open an available mode of the model. Settings and cost are shown in the editor.

Create with Kling 4.0 Flash
Specifications

Kling 4.0 Flash technical specifications

Model specifications. Available modes and settings are shown in the editor.

ParameterValueNote
Duration3–20 secondsFor clips up to 30 seconds, use Kling 4.0
Resolution720pNo 1080p, 4K or HDR in Flash
ModesText, first frame, referencesNo last or intermediate frames — only the first one
SoundNative, always onSpeech, ambience and music are generated with the video
Aspect ratioAuto, 16:9, 9:16, 1:1, 21:9When you start from a photo, the photo sets the aspect ratio
InputsText up to 8,000 characters, images, videos, charactersUp to 10 images, 5 videos and 7 characters, 15 in total; input videos together run 2–20 seconds
Modes

What Kling 4.0 Flash can do

Three ways to start and video restyling — in one fast model.

Text to video

A scene with lines, ambience and music from a single description — 3 to 20 seconds.

Open this mode

Photo as the first frame

The clip opens on your photo and continues it with motion and sound; the aspect ratio comes from the photo.

Open this mode

Image and video references

Up to 10 images, 5 videos and 7 characters: a character's look, a product, a location, camera movement.

Open this mode

Video in a new look

Add a clip as a video reference and describe the style: the model keeps the motion and redraws the scene.

Open this mode
Comparison

Kling 4.0 Flash vs Kling 4.0

Flash is the fast, affordable model of the family; Kling 4.0 is for longer clips, 1080p and precise frame control.

ParameterKling 4.0 FlashKling 4.0
Duration and resolution3–20 seconds, 720p3–30 seconds, 720p or 1080p
FramesFirst frame onlyUp to 10: first, intermediate, last
VoicesA voice is bound to a characterUp to 3 standalone voices plus character voices
Workflow

How to create a video in Kling 4.0 Flash

Choose a mode, add your materials and set the duration.

01

Choose the basis

Text only, a photo as the first frame, or a set of references — images, videos and characters.

02

Link materials to the text

Refer to files with @-mentions: @image_1, @video_1, @first_frame or a character name.

03

Set length and sound

Pick 3 to 20 seconds and describe the lines, ambience and music.

Choose your materials and an available mode.

Create with Kling 4.0 Flash
Pricing

Pricing in Clipia

The price in credits grows with duration. The exact amount is shown in the editor before you start.

A 5-second clip costs 45 credits — the same clip in Kling 4.0 at 720p costs 75 credits. Sound is included. With a video attached the per-second rate is lower, but the source seconds are paid too: a 5-second clip from a 5-second video reference costs 60 credits.

With a video attached, twice the result's length is billed if the video is no longer than the result, or the sum of both lengths if it is longer. The server calculates the amount and shows it on the button before the run.

Prompting

How to write a Kling 4.0 Flash prompt

The model reads your text for both picture and sound.

01

Put lines in quotes

Write speech verbatim and say who speaks and in what voice. To give a character their own voice, bind a recording to the character.

02

Call materials by name

@image_1, @video_1, @first_frame, a character name — this tells the model which file does what. A mention of a file that is not in the request is rejected before the run.

03

Describe sound separately

List the background, effects and music in a separate sentence: sound is always on, and without a description the model picks it itself.

Use cases

Where Kling 4.0 Flash helps

Tasks where speed, price and many variations matter.

Drafts and variations

Try several ideas, angles and aspect ratios before you shoot the final version.

A clip from a product or character photo

The photo becomes the first frame and the model continues the scene with motion and sound.

A clip in a new style

A finished video as a reference: the motion stays and the scene is redrawn in the look you need.

API

Integration via the Clipia API

Connect the model's available modes to your apps via the Clipia API.

Before a request, check the mode's availability in the catalog and get a cost estimate. Parameters depend on the mode.

Clipia documentation
FAQ

Kling 4.0 Flash FAQ

About the model's capabilities and its status in Clipia.

Yes. Available modes open from the generation buttons on this page; the editor shows the current choice.

Flash is the fast, affordable model of the same family. Clips are shorter — up to 20 seconds, 720p only, only a first frame and no standalone voices. Kling 4.0 makes clips of up to 30 seconds in 720p or 1080p and accepts up to 10 keyframes and up to 3 standalone voices.

From 3 to 20 seconds, in whole seconds. For clips up to 30 seconds, choose Kling 4.0.

A 5-second clip costs 45 credits, the shortest, 3 seconds, costs 27 credits; sound is included. With a video attached: a 5-second clip from a 5-second video reference costs 60 credits. The exact amount for your settings is shown in the editor before you start.

Yes. All four clips were made with Kling 4.0 Flash in 720p with sound and no editing: a scene from text, a photo as the first frame, a scene from two image references and a video restyled as a watercolor.

Yes, for modes with active status in the Clipia catalog. Check parameters and cost before creating a task.

No: Kling 4.0 Flash renders in 720p only. For 1080p choose Kling 4.0; for 4K — Kling 3 or Kling O3.

No. Flash starts the clip only from a first frame — your photo, which also sets the aspect ratio. A clip through first, intermediate and last frames is what Kling 4.0 does.

Yes, if you bind a voice recording to a character: the character's lines then sound in that voice. Flash has no standalone voices like Kling 4.0.

The per-second rate with a video is lower, but the source seconds are paid too: if the video is no longer than the result, twice the result's length is billed; if it is longer, the sum of both lengths. Input videos together run 2 to 20 seconds. The server calculates the exact amount before the run and shows it on the button.

Create a video

Shoot your own scene in Kling 4.0 Flash

Describe the scene and the lines, add a photo as the first frame or references. The cost is shown before you start.

Create with Kling 4.0 Flash