What is a CSS Flexbox Generator?
CSS Flexbox (Flexible Box Layout) is a one-dimensional layout model designed to distribute space among items in a container and align them efficiently. It simplifies tasks that were historically difficult with CSS, such as centering content vertically, creating equal-height columns, and reordering elements without changing HTML. Our Flexbox Generator provides a visual playground where you can configure every flex property including direction, wrapping, justification, alignment, and per-item controls. The generated CSS updates in real time and can be copied directly into your stylesheets.
How to Use This Tool
Start with a preset layout or configure the flex container manually. Set the flex-direction, flex-wrap, justify-content, align-items, and align-content properties using the button controls. Adjust the gap value with the slider. Add or remove flex items (up to 12) and click on any item to configure its individual properties like flex-grow, flex-shrink, flex-basis, align-self, and order. The live preview updates instantly, and the generated CSS code includes both container and per-item styles.
Common Use Cases
- Building responsive navigation bars with evenly spaced or centered links
- Creating card layouts with equal-height items and consistent spacing
- Centering content both horizontally and vertically in containers
- Prototyping UI component layouts before implementing them in a framework
Why Use a Client-Side Tool?
This flexbox generator runs entirely in your browser with no data sent to any server. Your layout experiments and design decisions remain private. The tool provides instant visual feedback for every property change, making it faster than manually writing and testing CSS in a code editor. There are no account requirements, no rate limits, and the tool works offline once loaded. The generated CSS follows current standards and is compatible with all modern browsers.
Frequently Asked Questions
What is the difference between justify-content and align-items?
justify-content controls the distribution of items along the main axis (horizontal in a row, vertical in a column). align-items controls alignment along the cross axis (vertical in a row, horizontal in a column). Together, these two properties give you full control over how flex items are positioned within their container.
What does flex-grow do?
flex-grow determines how much a flex item should grow relative to other items when there is extra space in the container. A value of 0 means the item will not grow. A value of 1 means it will take an equal share of available space. If one item has flex-grow: 2 and another has flex-grow: 1, the first item gets twice as much of the remaining space.
When should I use Flexbox instead of CSS Grid?
Flexbox is best for one-dimensional layouts where you need to arrange items in a single row or column. It excels at distributing space, centering content, and handling dynamic numbers of items. CSS Grid is better for two-dimensional layouts where you need to control both rows and columns simultaneously. Many modern layouts use both: Grid for the overall page structure and Flexbox for individual component layouts.