What is Kling 4.0?
Kling 4.0 is one of the advanced video models available on Kling 4.0 Pro. It generates coherent multi-shot video with native audio, persistent character identity, and 1080p to 2K output for ads, education, social content, and storytelling.
Is Kling 4.0 free to try?
Absolutely. All new Kling 4.0 Pro users receive free credits to test text-to-video, image-to-video, and audio-driven generation features. There’s no upfront cost required to create your first AI video.
Can I use my videos commercially?
Full commercial usage rights are included with all Kling 4.0 Pro paid plans. Upgrade your pricing page plan to unlock full commercial usage rights, remove all watermarks from your outputs, and access the highest resolution export options. What makes Kling 4.0 different from other AI video tools?
Kling 4.0 stands out because it handles multi-shot storytelling well, keeps character and visual style more stable across scenes, generates native audio, and supports audio-driven video workflows.
Does it support Image-to-Video and Audio?
Yes, full support for both image-to-video and audio-driven generation is available. You can upload 1 or 2 reference images to lock in your clip’s opening and closing visual frames. Our Kling 4.0 Pro AI video generator can also create fully timed audio from scratch, including naturally lip-synced dialogue and context-matching sound effects that fit your scene. If you prefer to use your own custom audio, you can upload your own file to guide the entire video sequence when using Pro mode.
What formats and resolutions are supported?
All outputs are saved as standard MP4 files. Resolutions range from 480p to 1080p for Standard mode, and up to 2K for Pro mode. Supported aspect ratios are: 16:9, 9:16, 4:3, 3:4, 21:9, 1:1.
How long can videos be?
All generated clips run between 5 and 12 seconds long. This length range is specifically optimized for ads, social media content, and product explainers, while still keeping the output quality and narrative coherence as high as possible.
How do I get the best results?
To get the best possible outputs, add specific creative details to your text prompts: explicitly state your preferred lighting style, camera motion, and exactly what each character in your scene is doing. For image-to-video generation, use two reference frames to clearly define your clip’s opening and closing visual states. When using Pro mode with custom audio, a clean, noise-free audio track makes it much easier for the model to align lip movements correctly and match your content’s pace.
Do pay-as-you-go credits expire?
No, pay-as-you-go credits never expire. Any credits you purchase through one-time top-ups will stay in your account indefinitely. You can add credits whenever you need them and use them at your own pace whenever you’re ready to create.
What is the refund policy?
All new Kling 4.0 Pro subscriptions qualify for a 7-day no-questions-asked refund policy if you’re not satisfied with our service. For subscription renewal charges, please reach out to our support team within 72 hours of the charge posting to your account if you run into any issues, and our team will work directly with you to resolve your concern and answer any billing questions you have.