Developer Tools

CSS Flexbox Generator

Build CSS flexbox layouts visually with a live playground. Toggle flex-direction, justify-content, align-items, gap, and per-item properties. Copy production-ready CSS instantly.

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.flex-container {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  justify-content: flex-start;
  align-items: stretch;
  gap: 10px;
}

Free Online CSS Flexbox Generator — Visual Layout Playground

What Is a CSS Flexbox Generator?

A CSS flexbox generator is a visual tool that lets you experiment with flexbox properties and see the results in real time. CSS Flexbox (Flexible Box Layout) is the most widely used CSS layout model for arranging items in rows or columns with powerful alignment and distribution controls. Our free flexbox playground lets you toggle every container and item property, see the layout update instantly, and copy production-ready CSS code.

How to Use This Flexbox Generator

Start by selecting container properties using the segmented toggle buttons on the control panel. Set flex-direction (row or column), justify-content (how items are distributed along the main axis), align-items (cross-axis alignment), flex-wrap, and gap. The visual playground updates in real time. Click any child item to select it and adjust per-item properties like order, flex-grow, flex-shrink, flex-basis, and align-self. The CSS output panel generates clean code ready to copy.

Key Features

  • Live visual playground — see layout changes instantly as you toggle properties
  • Container controls — flex-direction, justify-content, align-items, align-content, flex-wrap, and gap
  • Per-item controls — click any item to set order, flex-grow, flex-shrink, flex-basis, and align-self
  • Add/remove items — dynamically add or remove flex children to test different layouts
  • Clean CSS output — production-ready code with class selectors, updated in real time
  • No vendor prefixes needed — flexbox has full support in all modern browsers

Understanding Flexbox Properties

Flexbox operates along two axes: the main axis (determined by flex-direction — row means horizontal, column means vertical) and the cross axis (perpendicular to the main axis). justify-content controls distribution along the main axis with options like flex-start, flex-end, center, space-between, space-around, and space-evenly. align-items controls positioning along the cross axis with flex-start, flex-end, center, baseline, and stretch. The flex-grow property on individual items determines how extra space is distributed — an item with flex-grow: 2 gets twice the extra space as one with flex-grow: 1.

Common Use Cases

  • Navigation bars — horizontal nav with evenly spaced or right-aligned items
  • Card layouts — rows of equal-height cards with wrapping
  • Centering content — perfect vertical and horizontal centering with justify-content and align-items
  • Sidebar layouts — fixed sidebar with flexible main content area
  • Form layouts — inline label-input pairs with consistent spacing

Tips and Best Practices

Use gap instead of margins for spacing between flex items — it is cleaner and does not add spacing to the edges. When using flex-wrap: wrap, add align-content to control how wrapped rows are distributed vertically. Remember that flex-basis sets the initial size of an item before flex-grow and flex-shrink are applied — it is often more predictable than using width. For equal-width items, set flex: 1 on all children. Avoid nesting too many flex containers — if your layout needs both rows and columns, CSS Grid might be a better fit for the outer structure.

Frequently Asked Questions