AppsFactory

CSS Flexbox Generator

Build flexbox layouts visually and copy the generated CSS.

Preview

1
2
3

Click an item to edit its individual flex properties.

Container Properties

Item Properties

Select an item in the preview to edit its properties.

Generated CSS

.flex-container {
  display: flex;
  flex-direction: row;
  justify-content: flex-start;
  align-items: stretch;
  flex-wrap: nowrap;
  gap: 8px;
}

CSS Flexbox Generator

Build flexbox layouts visually with our free CSS flexbox generator. Configure container and item properties, see your layout update in a live preview, and copy production-ready CSS when you are done. No more guessing at justify-content and align-items values -- see exactly what each property does as you adjust it.

Features

  • Visual builder for all flex container properties: direction, wrap, justify-content, align-items, align-content, and gap
  • Per-item controls for order, flex-grow, flex-shrink, flex-basis, and align-self
  • Add and remove flex items dynamically to test different layouts
  • Live preview that updates instantly as you change any property
  • Generated CSS output for both the container and individual items
  • Responsive preview pane that lets you test how the layout behaves at different widths
  • Preset layouts for common patterns like navigation bars, card grids, and holy grail layouts
  • Annotated labels on the preview showing which property controls which behavior

How to Use

  1. Start with the container settings panel and choose a flex direction (row or column).
  2. Set the wrapping behavior, then pick values for justify-content and align-items.
  3. Adjust the gap property to control spacing between items.
  4. Click "Add Item" to insert more flex children and observe how the layout adjusts.
  5. Select an individual item to fine-tune its flex-grow, flex-shrink, flex-basis, and alignment.
  6. Optionally load a preset layout and customize it from there.
  7. Copy the generated CSS from the output panel and paste it into your stylesheet.

Use Cases

  • Navigation Bars: Build horizontal nav layouts with evenly spaced or right-aligned menu items using flex container properties.
  • Card Grids: Create responsive card layouts that wrap onto new rows with consistent spacing using flex-wrap and gap.
  • Centering Content: Quickly center an element both horizontally and vertically inside a container with just two properties.
  • Form Layouts: Arrange form labels, inputs, and buttons in flexible rows and columns that adapt to different screen sizes.
  • Learning Flexbox: Experiment with every flex property in an interactive environment to build muscle memory before writing CSS by hand.

FAQ

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 layout, vertical in a column layout). align-items controls alignment along the cross axis (the perpendicular direction). Together, they give you full control over how items are positioned within the flex container.

When should I use flexbox instead of CSS Grid?

Flexbox excels at one-dimensional layouts where items flow in a single row or column. CSS Grid is better suited for two-dimensional layouts where you need precise control over both rows and columns simultaneously. Many real-world designs use both: Grid for the overall page structure and Flexbox for components within each grid area.

How do flex-grow and flex-shrink work?

flex-grow determines how much an item expands to fill available space relative to its siblings. A value of 1 means the item will grow equally with other items that also have a grow value of 1. flex-shrink works in reverse, controlling how much an item compresses when the container is too small. Setting flex-shrink: 0 prevents an item from shrinking below its base size.