AI Prompt Lab

Everything you need to write stronger AI prompts, in one free place: generators for each model, an improver, checker and comparison, image and video prompts, and libraries that keep your prompts in your browser.

AI Prompt GeneratorTurn your idea into a structured, ready-to-use prompt for ChatGPT, Claude, Gemini or DeepSeek — free, no sign-up. ChatGPT Prompt GeneratorCreate a clear, structured ChatGPT prompt from your idea: objective, context, constraints and output format. Free, no sign-up. Claude Prompt GeneratorWrite structured prompts for Claude for analysis, writing and long tasks: clear objective, context, constraints and output format. Free. DeepSeek Prompt GeneratorTurn your idea into a structured prompt for DeepSeek tasks — coding, analysis and writing. Free, no sign-up. Gemini Prompt GeneratorCreate structured instructions for Gemini text and analysis tasks in a clear format. Free, no sign-up. Prompt ImproverPaste any prompt and improve it by adding context, constraints and an output format while keeping your goal. Free, in your browser. Prompt Quality CheckerCheck any prompt and get a score out of 100, a list of present and missing elements, and a recommendation — free, without sending your text anywhere. Prompt ComparisonCompare Prompt A and Prompt B against clear criteria (role, context, output, constraints, structure) and see which is stronger. Free. Prompt TemplatesFillable prompt templates: content writing, research & analysis, image design and task automation. Pick a template and add your topic. Prompt LibrarySave your favorite prompts in your browser — no account, no server — and copy or delete them in one click. Image Prompt GeneratorBuild a professional image prompt from your idea — style, camera, lighting and aspect ratio — ready for Midjourney, Nano Banana, GPT Image and more. Image Prompt LibraryA local library for the image prompts you build or like: save, copy and delete with no account. Image → PromptUpload an image and get a prompt built from its main colors, lighting, color temperature and composition — locally, without uploading the image. Image → JSONExtract image data as JSON: name, type, size, dimensions, aspect ratio, color palette and brightness — locally, no upload. Image + Image → PromptSet each image's role (identity, style & lighting, environment, composition) and get structured merge instructions for any generator that accepts references. AI Video Prompt GeneratorTurn your idea into a structured video prompt: duration, aspect ratio, motion style, camera and continuity — ready for Veo, Kling, Seedance and more. Product Description GeneratorCreate a clear, well-structured description for a digital product or service: name, type, features, audience and call to action — no hype.

These tools build and check prompts inside your browser with no paid API and without sending your text. Image tools analyze visual data (colors, lighting, dimensions) locally and don't claim to recognize image content.