Flexbox layout builder for designing responsive one-dimensional layouts with a visual interface instead of property lookups. Set justify-content, align-items, flex-wrap, and gap values, then preview the layout before copying the CSS. Free and browser-based with no account or upload required.
The Flexbox Generator is a visual tool for building CSS Flexbox layouts through a GUI that shows the live result of each configuration change. You control all the key Flexbox properties: flex-direction (row or column), flex-wrap (whether items wrap to new lines), justify-content (alignment along the main axis), align-items (alignment along the cross axis), align-content (multi-line alignment), and gap. For individual flex items, you can configure flex-grow, flex-shrink, flex-basis, align-self, and order. The generated CSS includes both the container and item properties needed for the layout, ready to paste into your stylesheet. This tool is especially valuable for developers learning Flexbox, since the real-time visual feedback makes the often counterintuitive behavior of Flexbox properties immediately clear.
Flexbox became the standard for one-dimensional CSS layout after achieving broad browser support in 2015, and it remains the most widely used modern CSS layout tool. Understanding the axis model is fundamental to mastering Flexbox. The main axis runs in the direction of flex-direction: horizontally for row (the default), vertically for column. The cross axis is perpendicular to the main axis. justify-content aligns items along the main axis; align-items aligns items along the cross axis. This axis model trips up many learners because the meaning of "align" changes depending on the flex-direction, but the Grid Generator's visual preview makes these relationships immediately apparent. The space-between and space-around values of justify-content are particularly useful for navigation bars and button groups: space-between distributes items with equal gaps between them and no margin at the edges, while space-around adds equal space on both sides of each item (resulting in double space between items). For centering an element both horizontally and vertically, a flex container with justify-content: center and align-items: center is the cleanest approach in modern CSS, replacing the old vertical-centering hacks that plagued developers for years. The flex shorthand property (flex: grow shrink basis) is the recommended way to set flex item sizing. flex: 1 (equivalent to flex: 1 1 0) distributes available space equally among all items. flex: 0 0 auto (the default) sizes items based on their content without growing or shrinking. The generator produces the appropriate shorthand values for common configurations.