FluxMovKling 4.0 AI Video Generator

Kling 4.0 AI Video Generator Free

The Kling 4.0 AI Video Generator is FluxMov’s unofficial workspace for planning a 30-second 4K scene with audio. The form submits Kling 3 for 3–15 seconds, in 16:9 or 9:16, with sound optional. It does not generate a 30-second 4K file.

Model

Model Version

Prompt

0/5000

Try a prompt template

Fill the prompt box with a focused scene idea.

Aspect Ratio

Duration

Generate with Sound

Video will be generated with sound (+10 credits/second)

Credits required

250 Credits

Demo Video

Text to Video demo video

Start a generation to see progress and results here.

What does the Kling 4.0 AI Video Generator do?

The Kling 4.0 AI Video Generator turns a scene brief into a short video with sound. Start with text, or add one image when the subject is already decided. Kling’s 14 October 2026 user guide describes a 3 to 30 second generation, with 720p, 1080p, or 4K and stereo audio. Kling’s app offers that full model to every user. This form generates the shorter Kling 3 draft you can review now.

How do I compare a silent clip with a Kling 4.0 AI Video Generator cut?

Play the same action twice: once with sound off, once with sound on. A silent clip can look finished until the line, footstep, or room tone is missing. The Kling 4.0 AI Video Generator keeps that switch next to length and ratio, so you hear whether the picture and the cue land together.

Judge three things only. Does the subject stay the same? Does the camera move match the prompt? Does the sound belong to the action? If one of those fails, change that one control and generate again in the Kling 4.0 AI Video Generator.

Why a five-second silent draft falls apart

The story is squeezed

A product reveal, a reaction, and a logo hit cannot all fit in a few seconds. Kling 4.0’s 30-second note exists so those beats have time. Preview the opening here, then write the rest.

Silence feels unfinished

Viewers notice a mouth moving with no voice, or a hit with no impact. Sound belongs in the Kling 4.0 AI Video Generator brief, not in a file you hope to add later. Leave sound on in the Kling 4.0 AI Video Generator and listen before you call the clip finished.

The picture is guessed

Without a still, the model invents the face or the pack. Upload the image when that identity is the point of the clip. Test that still in the Kling 4.0 AI Video Generator.

Why choose the Kling 4.0 AI Video Generator

The Kling 4.0 AI Video Generator is where you test a longer scene before a full 4K pass. Use the Kling 4.0 AI Video Generator controls below and change one setting on the next draft.

Room for a longer scene

Kling 4.0’s public notes describe one pass from 3 to 30 seconds, so an action, a reaction, and a closing beat can share one clip. The generator here previews that idea in 3 to 15 seconds.

A sharper picture target

Kling’s 14 October 2026 user guide lists 720p, 1080p, and 4K, plus 10-bit HDR for the 1080p and 4K sizes. The overview marks that HDR output as coming soon. Today’s draft stays on the live Kling 3 path, so this form does not return a 4K file.

Sound in the same pass

Leave sound on to hear dialogue, ambience, or effects with the picture. Kling 4.0’s notes add dual-channel stereo and tighter lip sync; this form delivers the optional sound the current model supports.

References for identity

Upload one still when a person or product must survive the move. Kling 4.0’s Omni notes mention up to 15 references and 10 keyframes. This page accepts one image plus the prompt.

Why sound is the point of a longer Kling scene

A 30-second picture without audio still needs an edit. Kling’s Kling 4.0 user guide pairs the longer take with stereo and more stable lip sync across Chinese, English, Japanese, Korean, Spanish, Portuguese, German, French, Hindi, and other accents. In the Kling 4.0 AI Video Generator, use the sound control to test one cue before you write a longer line.

Keep the cue specific: a spoken sentence, rain, a product click, or a music sting. The Kling 4.0 AI Video Generator cannot lock a sound to the action if the note only says “epic sound.” Play that cue in the Kling 4.0 AI Video Generator with the sound control on.

What you can bring to the draft

The Kling 4.0 AI Video Generator takes a prompt, one optional image, a ratio, a length, and a sound choice. Send that set through the Kling 4.0 AI Video Generator before you judge the longer scene.

Inputs for the Kling 4.0 AI Video Generator
Input	What to provide	Why it matters
Prompt	Name the subject, action, place, camera move, and one sound cue in a single scene.	A compact brief is easier to judge than a script that tries to cover every shot.
Image	Optional JPG, PNG, or WebP with one product, character, or first frame.	Use an image when identity matters more than inventing the subject from text.
Length and sound	The live controls run 3 to 15 seconds, with sound on or off.	That is the range this generator can submit today. Kling 4.0 public notes describe a longer 30-second pass.

How do you use the Kling 4.0 AI Video Generator?

1 →
Choose text or a still image. Start from a written scene, or upload one clear image when the subject, product, or first frame should stay recognizable.
2 →
Set ratio, length, and sound. Pick 16:9 or 9:16, set a length from 3 to 15 seconds, and leave sound on when the draft needs dialogue, ambience, or effects.
3
Generate the audible draft. Review motion, identity, and sound, then change one detail before you extend the idea toward a longer 30-second scene.

After one change, run the Kling 4.0 AI Video Generator again and compare only that difference.

Three jobs this draft is built for

The Kling 4.0 AI Video Generator can start a product move, a spoken beat, or the opening of a longer scene from an input you already have. Give each job one pass in the Kling 4.0 AI Video Generator, then change a single detail.

Scene	Who	Start with	Do this	You get
Product ad	A marketer with a pack shot	One product image and a line about the camera move	Image mode, 9:16, sound on	A short vertical draft with motion and a sound bed
Short dialogue beat	A creator testing a spoken hook	A prompt with the line, face direction, and room tone	Text mode, 16:9, sound on	An audible 5 to 15 second performance test
Scene plan	A director blocking a 30-second shot	Subject, camera path, and the moment sound should enter	Generate a short cut, then note the later beats	A reviewable opening before a longer 4K pass exists

Which Kling video tool should you open?

Match the tool to the file you can make today. The Kling 4.0 AI Video Generator is the planning desk and the live short-draft form, not a separate 4K renderer. Read the Kling 4.0 AI Video Generator row as the draft you can make today.

Tool	Best for	Length	Picture	Sound
Kling 4.0 user guide	A full scene with keyframes and references	3–30 seconds	720p, 1080p, or 4K	Stereo, with lip sync
Kling 4.0 AI Video Generator	The draft you can generate on this page	3–15 seconds	16:9 or 9:16	Optional, on Kling 3
Kling 4.0 Flash	A faster 720p cut, per the user guide	Up to 20 seconds	Up to 720p	No separate audio spec
Kling 3.0 motion control	Shot order and continuity	Short sequence	Reference-led	Audio cues

Specs follow Kling’s user guide dated 14 October 2026. Kling’s app offers full Kling 4.0 to every user. This page still submits a Kling 3 draft, not that 30-second 4K job. The guide lists 10-bit HDR for 1080p and 4K, and its overview marks that HDR output as coming soon.

Use the Kling 4.0 AI Video Generator to test a short sound-on scene. Do not use it when you need a 30-second file, 4K output, 10 keyframes, or up to 15 references in one job.

How your prompt and image are handled

The prompt stays in the Kling 4.0 AI Video Generator until you generate. An image upload is sent with the Kling 3 job so the draft can follow that frame. Use photos, products, and likenesses you have rights to use. The Kling 4.0 AI Video Generator shows the credit estimate before the request, and a failed start does not hide the reason.

Kling 3 sample frame showing the short audio draft available in the Kling 4.0 AI Video Generator — Input: one Kling 3 text prompt. Output: a short Kling 3 sample frame, not a 30-second 4K Kling 4.0 file.

Kling 4.0 AI Video Generator questions

What is the Kling 4.0 AI Video Generator?

The Kling 4.0 AI Video Generator is FluxMov’s unofficial page for planning a Kling 4.0 scene and generating a Kling 3 draft with optional sound.

Can it make a 30-second 4K video with audio?

Kling’s 14 October 2026 user guide lists a 3 to 30 second generation, 720p, 1080p, or 4K, stereo audio, and 10-bit HDR for the 1080p and 4K sizes. That overview also marks the HDR output as coming soon. Kling’s app offers the full model to every user. The controls on this page currently submit Kling 3: 3 to 15 seconds, 16:9 or 9:16, and optional sound. They do not send a 30-second 4K job.

How is Kling 4.0 different from Kling 3.0?

Use Kling 3.0 here when you need a live sound-on draft up to 15 seconds. Kling’s 14 October 2026 user guide gives Kling 4.0 a 3 to 30 second length, up to 10 keyframes, up to 15 references, and 720p, 1080p, or 4K. Kling 4.0 Flash is the faster path: up to 20 seconds and 720p, without first-and-last frames or multi-keyframes.

Should I start from text or an image?

Use text when you only have a scene idea. Use an image when a face, product, outfit, or opening frame must stay stable. Both modes sit in the Kling 4.0 AI Video Generator and keep ratio, length, and sound in the same form.

Does the draft include sound?

Yes, when the sound control stays on. Kling 3 can add sound to the short draft. Kling’s Kling 4.0 description goes further: stereo, broader language coverage, and closer lip sync. Treat the result here as an audible preview, not a finished stereo master.

Is the first generation free?

You can open the Kling 4.0 AI Video Generator without an account. New accounts receive 120 free credits for 30 days after login. A 5-second Kling 3 Standard draft with sound costs 250 credits, so the default job needs more credits than the signup gift. The form shows the estimate before you submit.

Continue the same video job

Leave the Kling 4.0 AI Video Generator when the next job needs text only, a still, motion control, or a movement you want to copy. Come back to the Kling 4.0 AI Video Generator when the short draft is the job again.

Prompt storyboard used beside the Kling 4.0 AI Video Generator text mode

Text to VideoStay on a prompt when you do not have a still yet.

Still image prepared for image-to-video inside a Kling 4.0 AI Video Generator workflow

Image to VideoAnimate a product, face, or first frame you already have.

Kling 3.0 motion-control frame for creators comparing it with the Kling 4.0 AI Video Generator

Kling 3.0 Motion ControlPlan connected shots when continuity matters more than one take.

Short Kling sample frame linked from the Kling 4.0 AI Video Generator

Kling 2.6 Motion ControlUse a compact clip when one action and a camera move are enough.

Motion transfer preview for a job the Kling 4.0 AI Video Generator does not replace

Motion TransferCopy a movement from a reference clip onto a new subject.

Kling 3 Standard costs 40 credits per second, Kling 3 Pro costs 60, and sound adds 10 credits per second. Five seconds of Standard with sound costs 250 credits. Plans shown below are $9.90, $29.90, and $59.90 per month.

Credits for the next video draft

The estimate sits on the form. Open a plan when the draft needs more than the free credits.

STARTER

$9.90/month

Includes

1,000 credits/month

$0.99 / 100 credits

~8 video clips/month

All AI video models

All AI image models

Motion extraction and transfer

Precision hand and gesture control

Flexible character orientation modes

Standard queue priority

Generate a Kling 4.0 AI Video Generator draft

Write the scene, switch sound on, and make the short cut you can actually review.

Back to the generator

Updated 2026-10-16. Sources: Kling 4.0 user guide, 14 October 2026.