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CSS Flexbox Generator

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Flexbox options

Container
Alignment
Status
Idle

Live preview

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About CSS Flexbox Generator

This tool helps you build flexbox container styles visually. You can change direction, wrapping, alignment, spacing, and immediately see how items move inside the preview area.

It is useful for building navigation bars, button groups, card rows, centered layouts, responsive blocks, and small UI sections where CSS flexbox is the simplest layout option.

How to use it

  1. Choose the flex direction and wrapping behavior.
  2. Adjust justify-content, align-items, align-content, and gap.
  3. Use the live preview to check how items are placed.
  4. Copy the generated CSS or paste existing flexbox CSS and parse it.

Tips

  • Use justify-content to control the main axis.
  • Use align-items to control the cross axis.
  • Use flex-wrap: wrap when items need to move to the next line.
  • Use gap instead of margins for cleaner spacing between flex items.

Flexbox checks before using a generated layout

Flex behavior depends on intrinsic sizes and the complete grow, shrink, and basis combination—not only the visible direction and alignment controls.

Define flex sizing

Review flex-basis, grow, shrink, width, min-width, and max-width together so items distribute space predictably.

Test difficult content

Use long text, unbreakable strings, large images, empty items, localization, and different item counts to expose overflow.

Wrapping behavior

Check line breaks, gaps, cross-axis alignment, and orphaned items at widths around every wrap point.

Preserve logical order

Avoid using order or reversed directions when they make the visual sequence differ from DOM, focus, or screen-reader order.

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FAQ

What does justify-content do?
It controls how flex items are distributed along the main axis, which depends on the flex-direction value.
What does align-items do?
It controls how items are aligned on the cross axis inside the flex container.
When should I use flex-wrap?
Use flex-wrap when items should continue on another row or column instead of shrinking into one line.
Is flexbox better than CSS Grid?
Flexbox is usually better for one-dimensional layouts, while CSS Grid is better for two-dimensional page or section layouts.