Video model by Kuaishou
Kling 4 turns a prompt, a photo, or a first and a last frame into a 720p clip of 3 to 15 seconds, and every clip comes with sound.
Examples
Clips Kling 4 made from a written prompt or one picture, played as they came out.
01Sound on every clip
Kling 4 always renders audio with the video; there is no silent version and no switch to turn it off. That suits clips meant to be posted as they are: footsteps on a wet street, a crowd cheering, a kettle starting to whistle. Write what should be heard next to what happens on screen, for example “rain on the window, no music”.
02Start and end on your own frames
Add a first frame and a last frame, and Kling 4 makes the clip that moves from one to the other. Use it for a before and after, a room that goes from empty to furnished, or a product that turns from front to back. Pick two photos of the same scene and the same shape, and let the prompt describe how the change happens.
03Photos into moving shots
Add one image as the first frame and Kling 4 brings it to life, keeping the shape of your photo: a vertical phone shot gives a vertical clip, a wide landscape gives a wide one. Try a street portrait that turns to the camera, a plate of food with rising steam, or a sleeping cat that wakes up. Your prompt only needs the motion and the sound.
04Five lengths, 3 to 15 seconds
Choose 3, 5, 8, 10 or 15 seconds. Three seconds is enough for a quick test of a prompt, a loop or a reaction; 15 seconds holds a short scene with a setup and a payoff. Write one idea per clip, open on the subject so the first frame already tells the story, and land the payoff before the last second.
05Four ratios from text
Without an image, choose the frame yourself: 9:16 for TikTok, Reels and Shorts, 16:9 for YouTube, 1:1 for feeds, or 21:9 for a wide cinematic strip. Every ratio works with every length from 3 to 15 seconds, and the clip renders in 720p whichever shape you pick.
06720p, ready for phones
Kling 4 renders every clip in 720p on this site, in all modes and at every length. There is a single quality setting, so the settings menu only asks for the length, plus the shape in text mode. For clips watched on phones and in social feeds, where most short videos end up, 720p holds up well.
Kling 4
Short 720p clips from 3 seconds, with sound on every one
Write who is in the clip, what they do, where the camera is and what we hear. For image to video, drop a photo on the first-frame slot, and add a second one as the last frame if the clip should end on it.
In text mode, pick one of four aspect ratios. Then choose 3, 5, 8, 10 or 15 seconds. Quality is fixed at 720p and sound is always on, so there is nothing else to set before you create.
Press Create; the button shows the credits for these settings before anything is charged. Sign in and top up only when you need to, then download the MP4 or find it again later in My videos.
Kling 4, also called Kling 4.0, is a video generation model from Kuaishou. It makes short clips from a written prompt, from one starting image, or from a first and a last frame, and it always renders sound with the picture. On Copy That Video you can run it right on this page, or select it from the model menu on the text-to-video and image-to-video tools.
From 3 to 15 seconds. The length menu offers 3, 5, 8, 10 and 15 seconds. Credits are charged per second, so shorter clips use fewer of them, and 3 seconds is a cheap way to test a prompt. If you need one continuous take longer than 15 seconds, switch to Seedance 2.5, which goes up to 30 seconds at 480p or 720p.
Every Kling 4 clip on this site renders in 720p, at every length and in every mode. Because there is a single quality setting, the settings menu only asks for the length, plus the aspect ratio in text mode. If you need more detail for a clip of 15 seconds or less, MiniMax H3 renders in 2K.
No. Kling 4 always generates audio with the video, so there is no audio switch while it is selected. You can still say what you want to hear in the prompt, for example “only wind and distant traffic, no music”. If you need a silent clip, mute it in your editor, or use Seedance 2.0 or 2.5, where audio can be switched off.
In text mode, Kling 4 builds the whole scene from your words, and you choose one of four aspect ratios. With a first frame, your photo opens the clip and the clip keeps the photo’s shape, so there is no ratio to pick. With a first and a last frame, the clip starts on one photo and ends on the other. There is no reference-picture mode for Kling 4 here. Lengths, quality and sound are the same in every mode.
Each run is priced per second of video, so the length you pick sets the total, and the Create button shows the exact credits before you pay. Credits come in one-time packs and never expire. If a render fails, the credits are returned to your balance automatically, so you only pay for clips that finish.
Your photos are kept only while the model works on them and are deleted as soon as the render ends, whether it succeeds or fails. The finished clip is saved to My videos for you to watch and download again. Only upload images you have the right to use, and never photos of other people without their consent.
All four work from text or from a first frame. Kling 4 renders in 720p, runs 3 to 15 seconds and always includes sound. MiniMax H3 also always has sound, renders in 2K and runs 4 to 15 seconds. Seedance 2.0 offers 480p or 720p, 4 to 15 seconds and sound you can switch off. Seedance 2.5 offers 480p or 720p with clips of up to 30 seconds.
Same prompt box, different limits. Switch any time from the model button.
Seedance 2.5
ByteDance
Long single takes of up to 30 seconds, with sound
Seedance 2.0
ByteDance
Shot-by-shot scenes with sound, in any of six shapes
MiniMax H3
MiniMax
Short clips in 2K with sound on every one
