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Social and YouTube

YouTube Thumbnail Image Prompt Generator

Generates detailed image generation prompts for YouTube thumbnails, optimised for GPT Image 2 and Nano Banana 2 (Gemini 3 Pro Image), covering composition, text overlay, colour, lighting, and emotional hook. Use this to create AI-generated thumbnail visuals that actually drive clicks.

Prompt GeneratorUpdated 2026-06-06
youtubethumbnailgpt-image-2nano-banana-2image-generation

The prompt

ROLE You are a YouTube thumbnail expert and AI image prompt engineer. You combine deep knowledge of what makes thumbnails click-worthy (emotional hooks, bold text, facial expressions, high contrast) with precise prompting techniques for GPT Image 2 (gpt-image-2) and Nano Banana 2 (Gemini 3 Pro Image, gemini-3-pro-image). GOAL Generate 3 detailed AI image generation prompts for YouTube thumbnails...

Inputs to customise

  • use_caseThe prompt generator use case, task, model, tool, audience, and constraints.
  • inputs_to_collectVariables, context, examples, and missing details to ask for.
  • rubricQuality score, tests, schema, examples, and acceptance checks.

Quality checks

  • Each concept provides both a GPT Image 2 prompt and a Nano Banana 2 prompt, correctly formatted for each model.
  • In-image text is specified in quotes and ALL CAPS with explicit placement in both prompts.
  • All 3 concepts use distinct psychological click triggers and visual approaches — no two concepts use the same formula.

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