The Flexbox Layout Generator is a free online tool that helps front-end developers visually configure CSS Flexbox properties and preview results in real time. It supports full configuration of container properties (flex-direction, justify-content, align-items, flex-wrap, align-content, gap) and item properties (flex-grow, flex-shrink, flex-basis, align-self, order), generating copy-paste-ready CSS code with one click.
flex-direction defines the main axis direction: row (default, left to right), row-reverse (right to left), column (top to bottom), column-reverse (bottom to top).
justify-content defines alignment along the main axis: flex-start, center, flex-end, space-between, space-around, space-evenly.
align-items defines alignment along the cross axis: flex-start, center, flex-end, stretch, baseline.
flex-wrap defines whether items wrap: nowrap (default), wrap, wrap-reverse.
align-content defines line alignment when wrapping: flex-start, center, flex-end, space-between, space-around, stretch.
gap defines the gap between flex items.
flex-grow defines how much an item grows relative to others; flex-shrink defines shrink ratio; flex-basis defines the initial size on the main axis; align-self overrides align-items for a single item; order defines the visual order of items.
Yes, completely free. Pure frontend implementation, all processing happens locally in your browser. No registration required.
All modern browsers including Chrome, Firefox, Safari, and Edge. Internet Explorer 11 does not support Flexbox.
No. All operations are performed locally in your browser. No data is uploaded to any server. Works offline.
The Holy Grail layout is a classic web layout pattern where the center content area expands to fill available space while sidebars remain at fixed widths. This is achieved by setting the center item's flex-grow to 1.
flex-grow determines how much an item expands to fill remaining space, while flex-shrink determines how much an item shrinks when space is insufficient. Together they control how items stretch and contract.