Kling 4.0 AI Video Generator: Up to 30-Second Videos Online, No App

Kling 4.0 is the fourth-generation video model from Kling AI, the video spin-off of the Chinese short-video company Kuaishou. It was announced on 28 September 2026 with early access, and opened to everyone in mid-October.

The headline change is length: Kling 4.0 generates up to 30 seconds in a single pass, where earlier models stopped at around ten and longer stories had to be stitched from clips. Kling also lists more realistic motion, tighter camera control and better consistency of people and objects across a long shot. People search for it as Kling 4.0, Kling 4, KlingAI 4.0 or 可灵 4.0.

• Choose a tab above: start from a prompt, or from a picture.
• Text to video: describe the subject, what happens, the camera and the mood. Image to video: upload the start frame, optionally an end frame, and say how it should move.
• Choose the length (3, 5, 10, 15 or 30 seconds), 720p or 1080p, and for text to video the aspect ratio (16:9, 9:16, 1:1 or 21:9).
• Press Generate. The button shows the price first; you only sign in at this step.
• Wait a few minutes — longer and 1080p clips take longest — then download the MP4.

On this page you get Kling 4.0 text-to-video, plus image-to-video with start and end frames, 3, 5, 10, 15 or 30 seconds, 720p or 1080p.

Some features Kling announced live only in Kling’s own app for now: 4K and 10-bit HDR output, Omni Reference with many reference clips and pictures, up to ten keyframes, and Kling 4.0 Flash. The official samples below show what the full app can do, so a clip made here with a single prompt or frame will be simpler.

Kling’s own app gives a small free allowance, and its paid plans unlock higher limits. On Vuddex there is no subscription to Kling: you pay per clip, from 95 credits (about $2.37–$3.16) for the shortest 720p video, more for longer or 1080p ones. New accounts get some free credits, but a Kling 4.0 clip costs more than that, so you need a one-time credit pack or a plan. The price is always on the Generate button, and failed videos are refunded.

Kling 4.0 Flash is a faster, cheaper version Kling released alongside 4.0, aimed at frequent, quick drafts. It is only available in Kling’s own app and to its subscribers for now, not through the hosting providers Vuddex uses. This page runs the full Kling 4.0 model; for quick, low-cost drafts here, use the shortest 720p setting.

All three run on Vuddex’s AI Video Generator. Pick Kling 4.0 when you need one long, continuous shot — up to 30 seconds — or a start and an end frame. Pick MiniMax Hailuo 2.3 for short silent clips at a lower price, and MiniMax H3 when you want native sound or 2K.

• Write it as beats in order: what we see first, what happens next, how it ends.
• Name the camera for each beat: wide shot, slow push-in, tracking shot, close-up.
• Keep one main subject and describe it the same way throughout, so it stays consistent.
• Give the light and mood once at the start: golden hour, neon night, soft window light.
• Start short: test the idea at the shortest 720p length, then make the long 1080p version.