VideoPromptLab

Free AI video prompt tool

AI Video Prompt Generator for Kling, Runway, LTX, Pika and Veo

Turn a rough video idea into a structured English prompt pack: platform-specific direction, shot script, keyframe prompts, negative prompt, and copy-ready output.

No API required
Copy-ready output
SEO MVP structure

Generated output

Copy-ready prompt pack

General AI Video

Platform format

12 seconds

Target length

16:9

Composition

Prompt

Final video prompt

General AI Video prompt. Universal prompt structure: Create a 12 seconds 16:9 video about A filmmaker places a tiny glowing city model on a desk and watches traffic lights turn on one by one. Style: cinematic realism; mood: tense but hopeful; camera: slow tracking shot. Use a clear subject, readable action, natural lighting, coherent spatial continuity, and a final frame that resolves the idea. Structure the clip around one visual job: introduce the subject, show one action or transformation, let the camera support that action, and end on a frame that communicates the concept without needing captions. Add enough concrete detail to guide any model, including subject appearance, setting, movement direction, light source, atmosphere, and what must remain consistent. Keep it portable across tools by avoiding proprietary syntax unless a platform requires it. Prepare the result as complete prompt pack.

Script

Shot-by-shot script

Shot 1 (3 sec): Opening frame: introduce A filmmaker places a tiny glowing city model on a desk and watches traffic lights turn on one by one with cinematic realism texture and a tense but hopeful tone.
Shot 2 (3 sec): Camera begins slow tracking shot; the subject performs the first clear action while the background remains coherent.
Shot 3 (3 sec): Escalate the visual beat with stronger light contrast, controlled motion, and consistent subject details.
Shot 4 (3 sec): End on a memorable final frame that preserves the 16:9 composition and resolves the idea.

Keyframes

Keyframe image prompts

1. Keyframe 1, 16:9: A filmmaker places a tiny glowing city model on a desk and watches traffic lights turn on one by one, opening composition, cinematic realism, tense but hopeful, clean subject silhouette, detailed environment, natural lighting.
2. Keyframe 2, 16:9: mid-action moment, slow tracking shot, visible motion direction, consistent subject identity, cinematic depth, controlled highlights.
3. Keyframe 3, 16:9: final resolved frame, emotional payoff, cinematic realism, stable composition, no clutter, strong thumbnail readability.

Cleanup

Negative prompt

low quality, blurry, warped hands, extra fingers, distorted faces, text artifacts, watermark, logo, jitter, flicker, melted objects, inconsistent anatomy, generic stock look, unclear subject, random camera shake

Audio

Voiceover or dialogue suggestion

English voiceover: "This is the moment an ordinary idea starts moving like a finished film." Keep the delivery tense but hopeful, concise, and under the visual rhythm of the shot.

Platform

Platform notes

- Use this version when you are moving between multiple AI video tools.
- Keep subject, action, camera, lighting, and mood in one readable paragraph.
- Add tool-specific constraints before generating.

Definition

What is an AI video prompt generator?

An AI video prompt generator turns a plain-language idea into production-style instructions for a video model. A useful prompt does more than name a subject. It explains what should happen, how the camera should move, what the light is doing, what the final frame should resolve to, and what visual problems the model should avoid.

VideoPromptLab is built for creators who switch between tools. Kling, Runway, LTX Video, Pika, Veo, and ComfyUI all respond to slightly different prompt structures, so the generator adapts the wording instead of giving you one generic paragraph.

Features

Why this generator is useful

Platform-specific prompt formats

Kling gets motion and lighting detail, Runway gets continuity language, LTX gets short clear action beats, and ComfyUI gets workflow-friendly prompt blocks.

A full prompt pack, not one sentence

Generate a final video prompt, shot-by-shot script, image keyframe prompts, negative prompt, and voiceover or dialogue suggestion.

SEO-ready content structure

The site includes crawlable guides, examples, FAQs, internal links, sitemap, robots, and metadata for testing organic acquisition.

Workflow

How it works

1. Describe the idea

Start with the subject, scene, and action. A simple idea is enough because the generator adds structure.

2. Choose a platform

Pick Kling, Runway, LTX Video, Pika, Veo, ComfyUI, or a general format. Each template changes the output.

3. Copy the prompt pack

Use the final prompt, shot plan, keyframes, negative prompt, and dialogue suggestion inside your preferred tool.

Platforms

Supported platforms

Platform
Best for
Prompt focus
Kling AI
Realistic motion, camera paths, and environment detail
Subject action, physical movement, light, reflections
Runway
Cinematic clips with consistency and polished framing
Continuity, subject consistency, motivated lighting
LTX Video
Short direct action clips with clean structure
One subject, one action, one location, no jumps
Pika
Playful social concepts and transformation ideas
Strong first frame, readable transformation, final loop
Veo
Natural language direction and filmic story beats
Pacing, continuity, plausible scene behavior
ComfyUI
Workflow-controlled image and video generation
Positive prompt, motion prompt, negative prompt

Examples

Prompt examples

Kling AI

Rainy founder reveal

A founder walks through a rainy neon street while an AI assistant appears as light reflections in shop windows

Kling AI prompt: cinematic realism, slow tracking shot, realistic light behavior, rain reflections, subject motion, detailed neon street environment, tense but hopeful mood.

Runway

Solar product launch

A matte black solar battery rotates on a clean studio plinth as warm sunrise light passes across the surface

Runway prompt: cinematic continuity, consistent product shape, controlled studio lighting, macro push-in camera movement, premium clean-tech commercial look.

LTX Video

Tiny robot chef

A tiny robot chef flips one perfect pancake in a compact kitchen and celebrates with a small light blink

LTX Video prompt: one subject, one compact kitchen, one clear action, short shot, no complex transitions, playful final frame.

MVP monetization

Built for later revenue tests

Creator workflow upgrades

Unlock advanced prompt packs, batch generation, and export options.

The free generator is designed for fast prompt drafting. Advanced packs, saved projects, platform presets, CSV export, brand voice, prompt history, and team workspaces are natural upgrade paths once real usage data shows which workflows matter most.

Recommended AI video tools

Editorial picks to compare before you spend credits

Disclosure plan

AI video generation tools

Compare platforms by motion quality, image-to-video support, pricing, and commercial terms.

Stock music and sound effects

Useful for turning generated clips into finished social videos.

Creator workflow software

Useful for storyboarding, editing, campaign planning, and publishing generated clips.

FAQ

AI video prompt generator FAQ

Is VideoPromptLab free to use?+

Yes. The MVP uses local templates in your browser and does not require a paid AI API. A future Pro plan may add batch generation, saved prompt packs, exports, and advanced styles.

Does the generator call OpenAI or another model?+

Not in this MVP. The prompt engine runs from local TypeScript templates, so it is fast, predictable, and easy to inspect. The code is structured so an API route can be added later.

Which AI video platforms are supported?+

The tool includes templates for Kling AI, Runway, LTX Video, Pika, Veo, ComfyUI, and a general AI video format.

Can I use these prompts commercially?+

You can use the generated text as a starting point, but always review the terms of the AI video platform you use and check rights for any uploaded images, logos, voices, or characters.