Free Online Bootstrap Grid Layout Generator & Code Exporter

Application Overview

The Free Online Bootstrap Grid Layout Generator is a high-precision utility for front-end developers to visualize and generate grid-based layouts without writing boilerplate code. It provides an interactive canvas to define rows, columns, and responsive breakpoints.

Core Features

• Visual Grid Builder: Interactive interface to add rows, split columns, and set column spans (1-12) for different breakpoints (sm, md, lg, xl, xxl).
• Responsive Breakpoint Controls: Dedicated toggles to define grid behavior per viewport size.
• Gutter Management: Real-time slider or selector for g-0 through g-5 Bootstrap gutter classes.
• Alignment & Justification: Graphical toggles for flexbox alignment classes (justify-content, align-items).
• Live Code Preview: A syntax-highlighted code block that updates in real-time as the grid is modified.
• One-Click Copy: Integrated button to copy generated HTML to clipboard.

User Interface Layout

• Header: Clean, minimalist title bar with a 'Reset Layout' primary action button.
• Main Content Area:
  • Left Panel (Configuration): Controls for adding rows, setting gutters, and defining breakpoint-specific column ratios.
  • Center Canvas (Preview): A clean, white area showing a scaled representation of the grid boxes.
  • Right Panel (Code Output): A scrollable, read-only window displaying the generated HTML code, optimized for readability.

Aesthetic & Design

• Color Palette:
  • Background: #FFFFFF (Pure White)
  • Primary Accent: #2563EB (Tailwind Blue-600) for active elements.
  • Secondary: #F1F5F9 (Slate-100) for container backgrounds.
  • Text: #1E293B (Slate-800) for maximum readability.
• Typography: Inter or System UI font stack for a professional, clean SaaS aesthetic.
• Transitions: Smooth easing (0.2s) for all UI interactions, hover states on buttons, and slide-in effects for new row additions.

Technical Directives

• Single File Architecture: All CSS (Tailwind via CDN) and Vanilla JS must reside in one HTML file.
• Sandboxed Environment: Use pure in-memory state management. Do NOT use localStorage or sessionStorage. All interactions must be stateless regarding the browser's persistent storage.
• Responsive Design: Ensure the control panels stack vertically on mobile screens (max-width 768px) and side-by-side on desktop viewports.
• Accessibility: Ensure all inputs have proper aria-labels and sufficient contrast ratios.
• Performance: Use efficient DOM manipulation techniques (e.g., DocumentFragment) to minimize reflows during complex grid updates.