CSS Flexbox Generator
Build flexbox layouts visually and copy the CSS. No sign-up required.
About the CSS Flexbox Generator — Visual Flexbox Builder
Flexbox is the foundation of modern CSS layouts, but remembering the interaction between flex-direction, justify-content, align-items, and flex-wrap can be tricky — especially when changing direction swaps the main and cross axes. This visual generator lets you toggle every container property and immediately see how items rearrange in a live preview. When the layout looks right, copy the generated CSS and paste it into your stylesheet. The tool covers all standard flex container properties including gap, which is now supported in all modern browsers.
What people use it for
- Prototype responsive navigation bars and toolbars
- Build card grid layouts with flexible wrapping
- Center elements vertically and horizontally
- Create evenly-spaced button groups with gap
- Learn flexbox visually while building real layouts
Private by design
Everything you type here is processed inside your browser. Nothing is sent to a server, logged or stored, so it is safe to use with real numbers, drafts and anything you would not paste into a hosted tool.
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Questions people ask
How do I use the CSS flexbox generator?
Click the property buttons to set flex-direction, justify-content, align-items, flex-wrap, and gap. The preview updates live, and the generated CSS code is ready to copy.
Does this generate responsive CSS?
The tool generates the flex container properties. You can combine the output with media queries in your stylesheet for responsive behavior.
What is the difference between justify-content and align-items?
justify-content aligns items along the main axis (horizontal for row, vertical for column). align-items aligns items along the cross axis (the perpendicular direction).
Is gap supported in flexbox?
Yes. The gap property is supported in flexbox in all modern browsers (Chrome 84+, Firefox 63+, Safari 14.1+, Edge 84+). It adds consistent spacing between flex items without needing margins.