AI Signboard Prompt Generator - Quoc Dang

AI Signboard Prompt Generator is a free browser extension built by Quoc Dang (Công ty TNHH Quảng Cáo Nội Thất Quốc Đăng), a Hanoi-based signage and advertising company, to solve a common problem for shop owners and marketing agencies: figuring out how to describe a new signboard concept to an AI image tool. Instead of manually typing out a prompt like "a minimalist coffee shop signboard in beige tones" and hoping the AI understands, users simply select their business type, signboard type (such as aluminum composite, raised letters, or an illuminated light box), design style, color tone, time of day, and camera angle from a floating panel, and the extension automatically assembles a detailed, correctly structured prompt ready to paste into any AI image generator.

The extension works on any website, including directly on the chat page of the AI tool itself, and automatically suggests a matching sign style, color palette, and lighting setup based on the selected business type, which users can freely fine-tune. A standout feature is its real-photo mode: users can upload an actual photo of their storefront, and the extension instructs the AI to composite only the new signboard onto that exact photo while preserving the building and surroundings, giving a realistic before-and-after preview instead of a fully imagined scene. It supports prompt-format tuning for multiple popular AI image platforms including ChatGPT, Gemini, Grok, and Microsoft Copilot, includes a built-in negative prompt to help avoid common AI image issues like blurry or distorted text and watermarks, and lets users save favorite option combinations for quick reuse later.

Additional features include a multi-language interface, light and dark mode, and a draggable, resizable control panel for easier viewing. All uploaded photos and selections are stored locally in the browser only, never uploaded to a server or shared with third parties, which makes the tool a privacy-friendly option for signage brainstorming. The extension is a strong fit for signage and advertising companies, shop owners planning a new storefront sign, marketing agencies preparing design concepts for clients, and anyone who wants to preview a realistic signboard idea before committing to real installation. It is available free on the Chrome Web Store, Firefox Add-ons, and Microsoft Edge Add-ons, and once a user is happy with a generated concept, Quoc Dang offers direct consultation and installation services to turn the AI-previewed signboard design into a real, professionally manufactured sign.