kling-4.0 / keyframe-to-video
Commercial usePart of the Kling API family — compare all Kling models →

Kling 4.0 is Kuaishou’s AI video model for professional video creation. It delivers realistic motion and synchronized audio, with up to 30s video in 720p and 1080p; 4K output is coming soon.

Model Type:
Pricing: 720P: 28.5 credits/s ($0.1425), 1080P: 42.5 credits/s ($0.2125) — billed on the output duration (3–30 s). High-tier top-ups include +10% bonus credits. Effective pricing is approximately 10% lower than the above rates.
Input

Video description

0/8000

Click to upload or drag and drop

Supported formats: JPEG, PNG, WEBP Maximum file size: 10MB

Click to upload or drag and drop

Supported formats: JPEG, PNG, WEBP, GIF, AVIF, BMP, SVG+XML, TIFF Maximum file size: 10MB; Maximum files: 8

Click to upload or drag and drop

Supported formats: JPEG, PNG, WEBP Maximum file size: 10MB

Upload an image file to use as input for the API

Output video duration

Output
output typevideo
Examples

Explore different use cases and parameter configurations

README

Complete guide to using Kling 4.0

Kling 4.0 API – Create 30s Kling AI Videos on Kie AI

Build with Kling 4.0 API for realistic motion, synchronized audio, Omni Reference and up to 30-second video generation in 720p and 1080p, with 4K output coming soon. Try Kling 4.0 online with new-user credits, then integrate the API into your apps and AI video workflows.

Original image

Explore Key Kling 4.0 API Capabilities on Kie AI

Professional Audio-Visual Performance with Kling 4.0 AI

Create more lifelike Kling 4.0 AI videos with stable dynamic motion and immersive audio. Kling 4.0 handles high-speed movement, continuous action, tracking shots, orbit shots, and complex camera motion while keeping scenes smooth and stable. Improved Lip Sync keeps voices and performances naturally synchronized, while two-channel stereo, realistic lighting, detailed textures, and more expressive characters bring greater realism to every scene.

Greater Creative Control with Kling 4.0 Omni Reference

Use Omni Reference to give Kling 4.0 AI video generation more precise visual and motion guidance. Kling 4.0 supports up to 15 reference items across images, videos, voice references, and subjects. Combine references to control characters, products, actions, camera movement, composition, visual styles, and narrative pacing while maintaining stronger consistency across the generated video.

30-Second Storytelling with Multi-Keyframe Control

Tell longer and more complete stories with the Kling 4.0 API, supporting video generation from 3 to 30 seconds. Kling 4.0 can maintain continuous actions and narrative development across longer sequences, while up to 10 keyframes give you precise control over important character states, scene changes, and story beats. Prompts of up to 8,000 tokens provide even more room to describe complex creative ideas.

Generate High-Resolution Kling 4.0 AI Videos in 720p and 1080p

Bring more detail to Kling 4.0 AI video with support for 720p and 1080p resolution. Kling lists 4K output and 10-bit HDR for 1080p and 4K as coming soon, and they will be added on Kie AI once available. Support for 21:9 ultrawide, 16:9, 1:1, and 9:16 aspect ratios gives creators more flexibility for cinematic, social, and vertical video formats.

Create Diverse Content with Kling 4.0 AI Video Generator

Explore a wider creative range with the Kling 4.0 AI Video Generator, from realistic vlogs, documentaries, and product ads to animation, short dramas, music videos, claymation, and stylized 3D content. Kling 4.0 supports multiple languages, accents, and dialects, along with clearer text, emoji, and logo generation. This makes it easier to create varied visual and audio experiences across different styles, formats, and languages.

How to Use Kling 4.0 API on Kie AI

  • Step 1: Get Your Kie AI API Key

    Create a Kie AI account and generate your API key from the API Key Management page. Your key gives you access to the Kling 4.0 API and is used to authenticate requests when you integrate Kling 4.0 into your application.

  • Step 2: Try Kling 4.0 Free in the Kie AI Playground

    Explore Kling 4.0 AI video generation in the Kie AI Playground before writing any code. New users receive free credits to test the model, experiment with prompts and references, and preview the estimated credit cost before generating. The credits required depend on your selected model settings and generation parameters.

  • Step 3: Create Your Kling 4.0 AI Video

    Choose Kling 4.0 and add your prompt, images, videos, or other supported references based on the generation mode. Adjust available settings such as video duration, resolution, aspect ratio, and other controls to shape the result, then generate and review your Kling 4.0 AI video.

  • Step 4: Integrate the Kling 4.0 Video API

    Once you have tested your workflow, connect the Kling 4.0 video API to your application using your Kie AI API key. Send generation requests from your app, track task status, and retrieve the finished video when processing is complete. Use the API to bring Kling 4.0 generation into your own products and automated workflows.

Compare Kling 4.0 and Kling 4.0 Flash on Kie AI

Kling 4.0 and Kling 4.0 Flash are built for different AI video generation needs. Kling 4.0 focuses on higher-quality output, longer videos, and greater creative control, while Kling 4.0 Flash prioritizes faster generation and better value for frequent creation. Kie AI provides access to both models, making it easy to choose between Kling 4.0 API and Kling 4.0 Flash based on your video quality, speed, and cost needs.

CapabilityKling 4.0Kling 4.0 Flash
Text to Video✓✓
Image to Video✓✓
Omni Reference✓✓
Video Duration3–30 seconds3–20 seconds
Resolution720p / 1080p (4K coming soon)720p
Dynamic Range10-bit HDR (coming soon)8-bit SDR
Multi-KeyframesUp to 10 keyframes—
Best ForHigher-quality, longer, more controlled video creationFaster, frequent, cost-efficient video generation

Why Use Kling 4.0 API on Kie AI

Access Kling 4.0 Through One Simple API

Connect to the Kling 4.0 API through a straightforward API workflow on Kie AI. Use a single API key and consistent integration process to access Kling 4.0 and bring advanced AI video generation into your apps, products, and automated workflows.

Try Kling 4.0 Free in the Online Playground

Explore Kling 4.0 free with new-user credits in the Kie AI online Playground. Test prompts, reference inputs, and available video settings before integrating the API. You can also check the estimated credit cost before generation, making it easier to understand usage before moving to larger workloads.

Affordable and Flexible Kling 4.0 API Pricing

Use the Kling 4.0 API with flexible, usage-based pricing that fits both experimentation and production workloads. Start small when testing Kling 4.0 AI video generation, then scale your usage as your application grows without committing to unnecessary capacity upfront.

Access Multiple Kling AI Models on Kie AI

Use multiple Kling AI models through the same platform instead of relying on a single model. Kie AI makes it easier to explore different Kling AI API options and choose the right model based on video quality, generation speed, cost, and creative requirements.

Get Faster Access to New Kling AI Models

Get access to newly supported models and model updates as the Kie AI model library continues to expand. Explore the latest Kling releases alongside other leading AI video models without rebuilding your entire integration whenever a new option becomes available.

Get Dedicated Support for Kling 4.0 API

Get responsive support when using the Kling 4.0 API on Kie AI. Whether you have questions about API integration, generation tasks, credits, or model usage, the Kie AI support team can help you troubleshoot issues and keep your Kling AI video workflows running smoothly.

What Can You Build with Kling 4.0 AI Video API

Kling 4.0 AI Video Generator Apps

Create a Kling 4.0 AI Video Generator that turns prompts and creative inputs into finished videos. Add Kling 4.0 video generation to creative SaaS products, content platforms, or specialized video tools for different audiences and workflows.

AI Advertising and Marketing Videos Powered by Kling 4.0

Build tools for product launches, social ads, campaign creatives, branded content, and other marketing formats. Kling 4.0 AI Video API can help turn campaign ideas, brand assets, and product materials into engaging promotional videos across different channels.

Character and Storytelling Tools Using Kling 4.0 Video API

Create applications for short dramas, character videos, animated stories, and cinematic content with Kling 4.0 video API. Build narrative-focused workflows that help users develop characters, scenes, and story progression across longer video sequences.

Kling 4.0 AI for Social Media Video Creation

Power tools for TikTok, YouTube Shorts, Reels, creator content, and branded social videos with Kling 4.0 AI. Turn creative ideas and visual assets into short-form videos designed for different social platforms and content formats.

E-Commerce Product Video Generators Using Kling AI API

Use Kling AI API to create product showcases, UGC-style promotions, campaign assets, and storefront videos. Turn product images and other creative assets into dynamic e-commerce content for brands, sellers, and online stores.

Automated Video Production with Kling 4.0 API

Connect Kling 4.0 API with content pipelines, AI agents, and automated systems to support repeatable video production. Generate video assets in larger volumes and automate recurring creation tasks without relying on a fully manual workflow.

Frequently Asked Questions

Kling 4.0 is an advanced AI video generation model developed by Kling AI, Kuaishou’s generative AI platform. It is designed to create high-quality videos with realistic motion, synchronized audio, stronger reference control, and longer narrative sequences, supporting native video generation up to 30 seconds.

New Kie AI users receive free credits that can be used to explore supported models in the online Playground. You can test Kling 4.0 AI video generation and review the estimated credit cost before generating. Whether a generation is fully covered by free credits depends on the selected settings and generation parameters.

Kling 4.0 supports native video generation of up to 30 seconds, giving creators more room for continuous actions and longer narrative sequences. The model also supports multiple keyframes for greater control over how a video develops over time.

Kling 4.0 on Kie AI currently supports 720p and 1080p video generation. 4K output is listed by Kling as coming soon and will be added once it is available.

Yes. Kling 4.0 API supports native audio output with two-channel stereo, allowing video and audio to be generated as part of the same creative workflow. It also improves lip sync for more natural synchronization between speech and character performance.

Kling 4.0 focuses on higher-quality output, longer video generation, and greater creative control. Kling 4.0 Flash is designed for faster, more cost-efficient generation and frequent creation. Both models can serve different AI video workflows depending on your priorities for quality, speed, duration, and cost.

Kling 4.0 supports up to 10 reference images. You can use them to provide visual guidance for characters, products, environments, composition, styles, and other creative elements.

Create a Kie AI account and generate an API key from the API Key Management page. You can first test Kling 4.0 AI Video Generator capabilities in the Kie AI Playground, then use your API key to connect Kling 4.0 to your application.

You can use Kling 4.0 AI Video API to build AI video generators, marketing video tools, storytelling platforms, social media video apps, e-commerce video generators, and automated video production workflows. Kling 4.0 is especially useful for applications that need longer sequences, reference-driven creation, and greater control over video generation.