CSS Flexbox Generator

Adjust container properties like direction, wrap, justify-content, and align-items using the dropdowns. Change the number of flex items with the slider. Click any item in the preview to customize its individual flex properties (grow, shrink, basis, align-self, order). Choose from presets like Center, Space Between, Navigation, or Sidebar. Copy the generated CSS and HTML for your project.

flex-grow controls how much an item grows relative to siblings when there is extra space. A value of 1 means it fills remaining space; 0 means it does not grow. flex-shrink controls how much an item shrinks when space is tight. Setting flex: 1 is shorthand for flex-grow: 1; flex-shrink: 1; flex-basis: 0 — a classic equal-width layout.

justify-content controls spacing along the main axis (the direction set by flex-direction). align-items controls alignment along the cross axis (perpendicular to the main axis). For a row layout, justify-content handles horizontal spacing and align-items handles vertical alignment.

Use flex-wrap: wrap combined with flex-basis to control when items wrap to the next line. Set item widths using flex-basis (e.g., flex-basis: 200px). In media queries, change the flex-direction or adjust item flex-basis to adapt to different screen sizes.

Flexbox is supported by all modern browsers — Chrome, Firefox, Safari, Edge, and Opera. Internet Explorer 10 and 11 have partial support with some bugs (especially with the shorthand flex property). For modern development, Flexbox is safe and widely used.

AI chatbots like ChatGPT and Claude generate text-only responses. They can describe flexbox code but cannot render, display, or let you interact with a visual flexbox layout. This tool provides a real, interactive flexbox preview that you can see and manipulate in your browser — something no AI can do.