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AI Signboard Prompt Generator is a free browser extension (Chrome, Firefox, Edge) that turns your business type, sign style, and color choices into ready-to-use prompts for ChatGPT, Gemini, Claude, Grok, and other AI image tools. Upload a photo of your real storefront and preview signboard concepts directly on it. The extension auto-matches sign type, style, and camera angle to your business, supports 7 in-app languages, and runs 100% locally, so no data ever leaves your device.