Kling 4.0 Flash video generator

What is Kling 4.0 Flash good at?

Quick, low-cost videos with sound: try an idea a few ways at 720p, then keep the one you like or move it to Kling 4.0 for 1080p and keyframes.

Kling 4.0 Flash examples with prompts

Each video is a single Kling 4.0 Flash generation at 720p, shown as it came out. Load a prompt into the generator above with one click.

Start frame, made with an image model for this example.

Prompt

Start exactly from @first_frame. A hand enters from the right, lifts the small glass jug and slowly pours cold milk into the iced coffee. Creamy clouds of milk curl and swirl down between the clear ice cubes in slow motion, the coffee turns caramel brown, droplets run down the glass. The camera slowly pushes in toward the glass. Soft clink of ice, quiet cafe ambience. Keep the glass, table, window and morning light exactly as in @first_frame. No text, no logo.

Try it with your own photo

Subject (two photos) and reference image, made with an image model for this example.

Prompt

Vertical social video, one continuous tracking shot along a sunny seaside promenade in the morning. @Rider rides the cherry red bicycle from @image_1 toward the camera, its wicker basket holding a baguette and a bunch of sunflowers, her auburn hair moving in the wind. She brakes, puts one foot down, smiles into the camera and says: "Best commute in the world." Gentle waves, a bicycle bell, gulls in the distance. Natural voice with clear lip-sync. No subtitles, no on-screen text.

Try it with this bicycle

Kling 4.0 Flash vs Kling 4.0: which should I use?

Use Flash for drafts, social clips and anything that is fine at 720p; it costs 38% less. Use Kling 4.0 for 1080p, videos longer than 20 seconds, an end frame or keyframes, and voice references. Both are in the same generator.

How much does Kling 4.0 Flash cost?

8 credits per second at 720p, open to free accounts. With a reference video it is 5 per second, counted over the reference plus the video and at least twice the video's length. Pick a length to see what it costs:

Rates as of November 9, 2026. Free credits refill to 40 every day. Free videos carry a watermark, are kept 7 days and are not for commercial use. See plans

How does Kling 4.0 Flash compare with other models?

Flash sits between the cheapest drafts and the full models: sound, subjects and up to 20 seconds at a low rate. All of these are in the same generator and share one credit balance.

Kling 4.0 Flash specs

Made by

Kling AI (Kuaishou), the faster, lower-cost version of Kling 4.0

Modes

Text to Video, Image to Video (start frame), Omni Reference

Length

3 to 20 seconds

Resolution

720p (1280x720 at 16:9)

Aspect ratio

16:9, 9:16, 1:1, 21:9; Image to Video follows the start frame

Sound

Always on, with lip-synced dialogue

References on VisionMorphic

Up to 10 images, 5 videos (20 seconds in total) and 7 subjects of 2–4 photos each, 15 in all

Images

JPG or PNG, up to 10MB

Prompt length

Up to 7,900 characters

How do I use Kling 4.0 Flash?

Sign in, write a prompt, add a photo or references if you like, and generate.

1. 1. Sign in with Google

   No card needed. New accounts get 40 free credits, enough for a 5-second Kling 4.0 Flash video.

2. 2. Write a prompt, add a photo if you like

   Text alone makes a video. Add a start frame for image to video, or reference images, videos and subjects and mention them as @Image1, @Video1 or @Subject1.

3. 3. Generate

   The Generate button shows the credit cost before you submit. Failed generations return their credits.

Questions