Free AI Prompt Generator for Gemini
A structured Gemini prompt generator for image generation (Nano Banana Pro) and video creation (Veo 3). Fill in a few fields, copy the JSON prompt, and get better results.
{ "prompt": "A dynamic scene featuring a mysterious character standing under gentle rain in the city night, glowing reflections on wet pavement, detailed composition", "negative_prompt": "blurry, low detail, dark, overexposed, watermark", "style_preset": { "style": "ultra realistic" }, "subject": { "outfit": "formal wear", "action": "standing still" }, "environment": { "background": "japanese zen garden" } }
How This Gemini Prompt Generator Works
Most people get mediocre results from Gemini because their prompts are too vague. A prompt like "create an image" gives the model almost nothing to work with. A well-crafted prompt with specific style, lighting, composition, and mood details produces professional-quality AI art and video. The problem is that writing those prompts from scratch takes time and practice.
This Gemini prompt generator handles the structure for you. For image prompts, you pick from fields covering physical appearance, outfit, action, emotion, background, lighting, camera type, shot type, and more. For video prompts, you set camera movement, duration, FPS, motion blur, sound effects, and music style. The tool combines your selections into a properly formatted JSON prompt that Nano Banana Pro and Veo 3 understand. The prompt updates as you fill in each field. Click "Copy" and paste it into Gemini.
The result is a complete, copy-paste ready prompt built around your idea, whether that's a character portrait, product visual, cinematic scene, or animated sequence.
Tips for Using This Gemini Prompt Generator
Start with Style and fill in the details from there. The Style field sets the overall direction ("ultra realistic", "cinematic", "anime", and so on). Once that's set, the Subject and Environment fields give Gemini the specifics it needs. Compare "a woman in a park" to filling in a linen outfit, late afternoon lighting, and a misty forest background. The second produces a usable result on the first try.
Use the Style and Lighting fields together. A style preset sets the overall look, but Lighting is what makes it feel real. Pairing "rim lighting" or "golden hour" with a style preset outperforms either used alone. For photography-style results, adding a real camera model in the Camera Type field takes it further.
Match prompt length to scene complexity. Simple subjects don't need much. A style, lighting, and clear subject description usually does it. Complex scenes with multiple characters, specific environments, and precise lighting benefit from filling in more fields. The generator scales naturally, so add detail where it matters.
Copy, test, then refine. Run the prompt, note what's off, adjust one or two fields, and run it again. Changing everything at once makes it hard to know what actually improved the result.
Frequently Asked Questions
A Gemini prompt generator creates optimized prompts for Google's Gemini AI models, including Nano Banana Pro (image generation) and Veo 3 (video generation). Rather than write prompts by hand, you fill in form fields to get a structured, JSON-formatted prompt ready for Gemini.
Good Gemini prompts are specific and well-structured. Include the subject, style, lighting, mood, composition, and technical details like camera angles or art styles. For images, elements like "cinematic lighting", "ultra realistic style", or "photorealistic" make a consistent difference. For videos, camera movement, duration, and scene details matter most.
No. The generator builds the JSON for you. Fill in fields like outfit, action, environment, and lighting. The tool structures everything into proper JSON format. Just copy and paste the output into Gemini.
This generator uses a structured JSON format with dedicated fields for camera settings, lighting, and cinematography. ChatGPT works better with conversational language, and Midjourney uses comma-separated modifiers. Gemini responds well to organized, field-based prompts with clear categories like subject, environment, and style filters.
Yes. The Camera Type field accepts real camera models, such as Sony Alpha a7 IV and Canon EOS R5, which Gemini uses as style references for more realistic, photographic results. Combine it with Lighting, Depth of Field, and a style like "ultra realistic" or "candid" for the most consistent output.
Aim for 4-6 key elements: subject, style, lighting, composition, mood, and any specific scene details. The generator handles structure, so longer prompts are fine if each field adds something specific. Vague filler words cause more problems than prompt length.
The most common causes are vague subject descriptions, conflicting style details, or missing environmental context. Make sure you have a clear subject, a consistent style, and specific lighting. Use the Negative Prompt field to exclude unwanted elements. Style filters like "ultra realistic" or "cinematic lighting" also help keep results consistent across generations.
Yes, completely free. Generate as many prompts as you need for your Gemini AI projects. Note that accessing Nano Banana Pro and Veo 3 through Google may have its own pricing depending on your usage level.
Yes. The prompts you generate are yours to use however you like. The commercial use rights for the actual AI-generated images and videos depend on Google's Nano Banana Pro and Veo 3 licensing terms. Check Google's current terms of service for details.