Kling 4.0: Make 30-Second AI Videos with Sound
Use Kling 4.0, the newest Kling model from Kuaishou, right in your browser. Type a prompt, start from an image or add up to 9 reference images, and get one continuous take of up to 30 seconds at 720p or 1080p, with dialogue, music and effects in stereo. No Kling subscription, nothing to install.
- Up to 30s in one take
- 720p or 1080p
- Stereo sound and lip sync
- Text, image or reference images
Sexually explicit (NSFW) content is strictly prohibited.
Kling 4.0 video examples
Clips made with Kling 4.0, each with the sound it generated. Hover to play and turn the sound on. Two come with the prompt that made them; for the rest there is a starter prompt to try the same kind of shot.
Four words, a whole scene
From “An old man ranting about AI.” Kling 4.0 picks the man, the living room, the camera and the rant itself, speech and all, in 15 seconds.
Show the prompt
An old man ranting about AI.
A reunion on a UK street
A handheld shot brief: two old friends meet at dusk and hug, with footsteps, street sound, music and English dialogue from the prompt.
Show the prompt
A continuous 7-second shot set in the UK. Two friends who have not seen each other for a long time meet at the corner of a quiet street at dusk, surrounded by a diverse crowd going about their daily lives. They smile, walk quickly toward each other, and share a warm embrace. Their facial expressions and body movements are natural. A handheld camera follows them with subtle camera shake. Soft, warm lighting with a nostalgic cinematic film look. Include natural footsteps, street ambience, background music, and English dialogue.
30 seconds in one take
A storybook hedgehog carries the post through his village to a mouse’s door: one continuous 30-second shot with the same characters throughout.
Show a starter prompt
The original prompt for this clip was not published. This is a starter prompt for the same kind of shot.
One continuous 30-second shot in a storybook animated style. A small hedgehog postman in a green coat and red scarf, with a basket of letters on his back, walks down a flower-lined path through a sunny woodland village. The camera follows beside him as he greets neighbours, crosses a little bridge and stops at a round wooden door, where a grey mouse opens it and he hands her a sealed envelope. She smiles and says "For me?" Gentle orchestral music, birdsong, footsteps on the path.
Singing, lip-synced in stereo
A vocalist at the mic in a studio booth for 30 seconds, the voice matched to his mouth and the mix in two channels.
Show a starter prompt
The original prompt for this clip was not published. This is a starter prompt for the same kind of shot.
A young singer with curly hair, a white tank top and headphones stands at a studio microphone in a dark recording booth with blue accent lights. He sings a soulful verse straight into the mic, eyes closing on the long notes, then opens them and looks into the camera for the last line. Slow push-in. Clear lead vocal with a soft piano and bass backing, mixed in stereo.
A conversation at the desk
A traveller asks for directions at an information desk and two staff answer, the dialogue spoken and lip-synced in one take.
Show a starter prompt
The original prompt for this clip was not published. This is a starter prompt for the same kind of shot.
At a bright airport information desk, a traveller holding a paper map asks for directions: "Excuse me, how do I get to the city centre?" A staff member in a navy uniform smiles, points at the map on the counter and answers: "Take the express train from platform two, it leaves every fifteen minutes." Her colleague nods and adds: "It takes about twenty minutes." Medium shot, natural daylight, soft terminal ambience.
Dialogue in an accent
A fisherman mending nets on a harbour wall talks to camera in an Australian accent, gulls and wind behind him.
Show a starter prompt
The original prompt for this clip was not published. This is a starter prompt for the same kind of shot.
An old fisherman in a navy sweater and beanie mends a net on a sunny harbour wall, then looks up at the camera and says in a broad Australian accent: "Best fish in the bay come in before sunrise, mate." Gulls overhead, wind and water lapping against the wall. Handheld medium close-up.
Text that stays readable
A split-flap departure board clatters through its letters to “NORTH COAST 09:40”, every character spelled right.
Show a starter prompt
The original prompt for this clip was not published. This is a starter prompt for the same kind of shot.
Close-up of an old split-flap departure board in a train station. The flaps clatter and flip one by one until the board reads "NORTH COAST 09:40", every letter spelled correctly and steady. The camera slowly pulls back to show the platform and a few passengers below. The sound of the flaps clicking, station announcements in the distance.
A tracking long take
The camera follows a waiter with a stack of plates out of a busy kitchen and into a candlelit dining room, without a cut.
Show a starter prompt
The original prompt for this clip was not published. This is a starter prompt for the same kind of shot.
One continuous tracking shot with no cuts: the camera follows close behind a young waiter in a white jacket as he carries a tall stack of plates through a busy restaurant kitchen, past chefs at the stoves, through a swinging door and into a quiet candlelit dining room. Kitchen clatter fading into soft jazz.
What is Kling 4.0?
Kling 4.0 is the fourth generation of Kling, the AI video model from Kuaishou, the company behind the Kwai app. Kuaishou announced it at the end of September 2026 with an early-access phase and opened it to all users on October 15, 2026.
It makes one continuous take of 3 to 30 seconds, twice the 15-second limit of Kling 3.0, with two-channel stereo sound: dialogue, singing, effects and ambience, lip-synced to the picture. It speaks English, Chinese, Japanese, Korean, Spanish, Portuguese, German, French and Hindi, renders on-screen text legibly, and in Kuaishou’s own app takes up to 10 keyframes and up to 15 references in one generation.
ToonBee AI runs Kling 4.0 through fal, so this is an unofficial way to use it: not Kuaishou’s own service, and no Kling account needed. Here you can start from text, an image, a first and a last frame, or up to 9 reference images, at 720p or 1080p and 4–30 seconds, in 21:9, 16:9, 1:1 or 9:16.
How to use Kling 4.0 online
- 1
Write the shot like a brief
Describe the action, the camera and the sound, and put what a character says in quotes. Add an image to start from it, set a first and a last frame, or add reference images and cite them as @Image1, @Image2.
- 2
Pick the size, length and shape
The box starts on Kling 4.0 at 720p and the shortest length, the cheapest clip. Choose 720p or 1080p and 4–30 seconds; the credit cost updates as you go.
- 3
Generate and download
Press Generate. The clip lands in your history with its stereo sound and downloads as an MP4 with no watermark.
Kling 4.0 vs Kling 3.0, Seedance 2.5 and Wan 3.0
The models you can run from the same box, read from the generator’s own tables. Credits are for a 5-second clip, from the smallest size to the largest.
| Model | Max size | Length | Native audio | Image to video | First + last frame | Reference images | Credits (5s) |
|---|---|---|---|---|---|---|---|
| Kling 4.0 | 1080p | 4–30s | 393–588 | ||||
| Kling 3.0 | 1080p | 4–15s | 250–338 | ||||
| Seedance 2.5 | 1080p | 5–30s | 238–1,328 | ||||
| Wan 3.0 | 1080p | 4–30s | 125–500 |
Kling 4.0 and Seedance 2.5 both run to 30 seconds; at 1080p Kling 4.0 costs well under half as many credits here. Wan 3.0 is a little cheaper again, and Kling 3.0 is the cheapest Kling for clips of 15 seconds or less.
Kling 4.0 vs Kling 3.0
Kling 4.0 doubles the longest take from 15 to 30 seconds, moves to stereo sound, adds 21:9 and reference images, and speaks more languages. Kling 3.0 stays on the site and costs less per second for short clips.
Kling 4.0 vs Seedance 2.5
Both make 30-second takes with sound and lip sync. Seedance 2.5 adds a 480p tier, more shapes and reference video and audio; Kling 4.0 costs far fewer credits at 1080p. Run one prompt on each from the same box.
Kling 4.0 vs Wan 3.0
Wan 3.0 also runs to 30 seconds at 1080p with sound, and costs slightly less. Kling 4.0 mixes its sound in stereo. Try one prompt on both for the shot that matters.
Here vs the Kling app
Kuaishou’s own app has every Kling 4.0 feature, including 4K, 10 keyframes, reference video and editing, on a Kling subscription. Here you get Kling 4.0 at 720p or 1080p next to other models in one box, priced per clip.
Want Kling 3.0? See the Kling AI pageCompare every model on the site
Why use Kling 4.0 here
Up to 30 seconds in one take
A whole scene in a single generation, from a four-second test to a full thirty-second shot.
Stereo sound in the same pass
Dialogue, singing, music and effects come with the picture, in two channels. Put a line in quotes and the character says it.
Up to 9 reference images
Add the people, products or places to keep, cite them as @Image1 and @Image2 in the prompt, and Kling 4.0 builds the shot around them.
720p or 1080p, rendered natively
Both sizes come straight from Kling 4.0, with no upscale pass in between, in 21:9, 16:9, 1:1 or 9:16.
No Kling account or subscription
No separate sign-up, no API key, no GPU. It runs in any modern browser on a laptop, a PC or a phone.
The price before you press
The box shows the credit cost before you generate, and if a generation fails its credits come back automatically.
What people make with Kling 4.0
Short drama scenes
A full 30-second scene with dialogue in one take, long enough for a beat that lands.
Product ads
Add product and model photos as references and get a spot with music and close-ups.
Talking and singing characters
Speech or song lip-synced in the same clip, in English or another of the languages it speaks.
Titles and signage
Quote the words in the prompt and they come out spelled right on signs, packaging and title cards.
Vertical clips for the feed
Native 9:16 for TikTok, Reels and Shorts, generated upright rather than cropped.
Photos brought to life
Start from a photo or an image you made, or pin both the opening and the closing frame.
Need a whole story with narration? Try the story video generator
Kling 4.0 price: is it free?
Kling 4.0 is billed by the second wherever you use it. In Kuaishou’s own app it comes with Kling’s paid plans; check klingai.com for its current credits and terms.
On ToonBee AI the account is free and generating uses credits, priced per clip; the box shows the cost before you press. A 5-second clip is 393 credits at 720p and 588 at 1080p, and the cost scales by the second: a full 30-second take is 2,355 credits at 720p and 3,525 at 1080p.
Plans start at $39 a month for 5,000 credits. Prefer not to subscribe? A one-time pack is $49 for 4,000 credits that never expire. Every plan covers commercial use and downloads with no watermark.
Good to know before you start
- One clip runs 4–30 seconds. For something longer, ToonBee 1.0 makes an edited video from 15 seconds, and the story video generator builds narrated videos of several minutes.
- Sizes here are 720p and 1080p. Kling’s own app also lists 4K, and 10-bit HDR and video extension to two minutes are announced as coming soon.
- The reference tray takes up to 9 images. Reference video, elements, voices, keyframes beyond the first and last, video editing and per-shot prompts are Kling 4.0 features that are not offered here.
- Every take comes with its stereo sound; there is no switch to turn it off, and the price includes it.
- Kling 4.0 Flash, the faster 720p model in early access, is not offered here.
- Kling runs with its own content filter, which turns away some prompts and images. A refused generation gives its credits back.
Kling 4.0 FAQ
What is Kling 4.0?
Kling 4.0 is the newest AI video model from Kuaishou. It turns text, images and references into one continuous take of up to 30 seconds with stereo sound and lip-synced dialogue.
When was Kling 4.0 released?
Kuaishou announced Kling 4.0 at the end of September 2026 with an early-access phase, and opened it to all users on October 15, 2026. It is out now, in Kuaishou’s app and through API providers such as fal.
Is Kling 4.0 free?
Kling 4.0 itself is billed by the second. On ToonBee AI the account is free, but generating uses credits: the shortest clip, 4 seconds at 720p, is 314 credits, and credit packs start at $49.
How much does Kling 4.0 cost?
Here a 5-second clip is 393 credits at 720p and 588 at 1080p, a 10-second clip at 1080p is 1,175, and a full 30-second take at 1080p is 3,525. Plans start at $39 a month for 5,000 credits.
How long can a Kling 4.0 video be, and what resolution?
Kling 4.0 makes 3 to 30 seconds in one take. Here each clip is 4–30 seconds at 720p or 1080p, in 21:9, 16:9, 1:1 or 9:16. Kling’s own app also lists 4K.
Does Kling 4.0 generate audio and lip sync?
Yes. Every take comes with two-channel stereo sound made in the same pass: dialogue, singing, effects and ambience, lip-synced to the picture. Write a line in quotes and the character says it.
Kling 4.0 vs Seedance 2.5: which is better?
Both make 30-second takes with sound and lip sync. Seedance 2.5 adds a 480p tier, more shapes and reference video and audio; Kling 4.0 costs far fewer credits at 1080p here. Both are in the same box, so you can run one prompt on each.
Kling 4.0 vs Kling 3.0: what changed?
Kling 4.0 doubles the longest take from 15 to 30 seconds, moves to stereo sound, adds 21:9, up to 10 keyframes and up to 15 references, and speaks more languages. Both are on ToonBee AI.
Can Kling 4.0 turn an image into a video?
Yes. Add an image and Kling 4.0 starts the clip from it, keeping its shape; add a second one to set the last frame too. Or add up to 9 reference images and cite them in the prompt.
What is Kling 4.0 Flash?
Kling 4.0 Flash is the faster, cheaper sibling for drafts: 720p and up to 20 seconds, in early access. It is not offered on ToonBee AI; the full Kling 4.0 is.
Is there a Kling 4.0 API?
Kuaishou has announced its own developer API as coming soon, and API providers such as fal already serve Kling 4.0. ToonBee AI does not sell API access; it lets you use Kling 4.0 in the browser with no key.
Is this the official Kling AI site?
No. ToonBee AI is an independent video generator, not affiliated with Kuaishou. It runs Kling 4.0 through fal. Kuaishou’s own Kling app is at klingai.com.
Can I use Kling 4.0 videos commercially?
Yes. Videos you make on ToonBee AI can be used commercially, and they download with no watermark.
Make your first Kling 4.0 video
Type a prompt or add an image. No GPU, no install, and the price shows before you generate.
Make a Kling 4.0 videoRelated tools
Other pages that open the same studio, set up for a different kind of video.
- Kling AI Video GeneratorKling 3.0 clips up to 15 seconds, in 1080p with sound.
- Dola AI Video GeneratorDola-style Seedance videos online, with no watermark.
- Wan AI Video GeneratorWan 3.0 videos up to 30 seconds, in 1080p with sound.
- MiniMax H3 Video GeneratorMiniMax H3 videos with sound, on H3 Max in your browser.
- PixVerse AI Video GeneratorPixVerse V6 and C1 clips up to 15 seconds, in 1080p with sound.
- Vidu AI Video GeneratorVidu Q3 clips up to 15 seconds, with dialogue and sound.
- AI ModelsEvery video and image model, with lengths and prices.
- LibTV AI Guide & English AlternativeLibTV explained, priced and compared with ToonBee AI.
ToonBee AI is an independent video generator. It runs Kuaishou’s Kling 4.0 through fal, a third-party API provider. It is not the official Kling AI site (klingai.com) and is not affiliated with or endorsed by Kuaishou. Kling is a trademark of its owner.