Kling 4.0 AI Video Generator: 30-Second Clips with Stereo Sound

Kling 4.0 makes clips up to 30 seconds (3.0 stops at 15), adds two-channel stereo audio, a 21:9 aspect ratio, and Omni Reference with images, videos, and audio. It is also designed for steadier fast motion and camera moves.

You can choose any whole-second length from 3 to 30 seconds per generation.

On AIEffect you can generate in 720p or 1080p, with 16:9, 9:16, 1:1, or 21:9. With Auto, the ratio follows your start frame or reference media.

Yes. Audio is always on: Kling 4.0 generates stereo sound together with the video, including dialogue, music, and sound effects. You can describe the audio in your prompt or upload an audio clip as a reference.

Yes. Upload your photo as the start frame. You can also add an end frame, and Kling 4.0 creates the motion between the two images.

Omni Reference lets you guide one video with several inputs: up to 10 images, 5 videos (30 seconds combined), and 3 audio clips, with a maximum of 15 in total. Type @ in your prompt to tell the model which reference to use where.

No. Choose one mode per generation: either start and end frames, or reference images, videos, and audio.

Pricing is per second: 32 credits per second at 720p and 47 credits per second at 1080p. Using reference videos costs extra because the input footage is billed too. The generator shows the exact cost before you submit.

Usually around 3 to 4 minutes. Kling 4.0 renders more slowly than Kling 3.0, and longer or higher-resolution videos may take a bit more time.

No. AIEffect gives you Kling 4.0 with pay-as-you-go credits. New accounts get trial credits, and there is no monthly plan.

Longer ads and product videos, short story scenes with dialogue, music videos, social clips in 9:16, widescreen 21:9 shots, and keeping the same character across several videos.