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CSS & Design Generators

CSS Flexbox Generator

Build flexbox layouts visually — set direction, justify, align, wrap, and gap with a live preview, then copy ready-to-use flexbox CSS. Free, no sign-up.

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💡 How to use

  • Change the dropdowns to see how each flexbox property moves the items live.
  • Add or remove items to test wrapping and alignment.
  • Copy the .container CSS and apply it to your own flex parent.

Free CSS Flexbox Generator

Build CSS flexbox layouts visually and copy the code in one click. Change flex-direction, justify-content, align-items, wrap, and gap with a live preview, add or remove items to test alignment — then paste ready-to-use flexbox CSS into your project. Free and browser-based.

What is CSS Flexbox?

Flexbox (the CSS Flexible Box Layout) is a one-dimensional layout system for arranging items in a row or a column. It makes it easy to distribute space, align items, and handle different screen sizes without floats or hacks. Flexbox is the go-to tool for navigation bars, button groups, card rows, centering content, and any layout where items sit along a single line.

The main flexbox properties

This generator exposes the properties you set on the flex container:

  • display: flex — turns an element into a flex container.
  • flex-direction — lays items in a row or a column.
  • justify-content — distributes items along the main axis.
  • align-items — aligns items across the cross axis.
  • flex-wrap — lets items wrap onto multiple lines.
  • gap — sets consistent spacing between items.

How to use the flexbox generator

It is fully interactive:

  • Pick a flex-direction, then adjust justify-content and align-items.
  • Toggle wrapping and set the gap between items.
  • Add or remove items to see how the layout responds.
  • Copy the generated container CSS and apply it to your own element.

Main axis vs cross axis

Understanding the two axes is the key to flexbox. The main axis runs in the direction of flex-direction — horizontal for row, vertical for column. justify-content positions items along that main axis, while align-items positions them along the perpendicular cross axis. When you switch flex-direction from row to column, the roles of these two properties visually swap, which the live preview makes easy to see.

How to center anything with flexbox

One of the most common questions in CSS is how to center an element both horizontally and vertically. With flexbox it is three lines: set display: flex, justify-content: center, and align-items: center on the parent. Whatever sits inside is perfectly centered on both axes, regardless of its size — a technique that used to require awkward workarounds before flexbox existed.

Pro tip

Use gap instead of margins to space flex items — it is cleaner, avoids extra space at the edges, and is supported in all modern browsers. For two-dimensional layouts with both rows and columns, reach for CSS Grid instead; try our CSS Grid Generator for that.

FAQ

Is this Flexbox Generator free?
Yes. It is completely free, runs in your browser, and requires no account or sign-up.
How do I center a div with flexbox?
Set display: flex, justify-content: center, and align-items: center on the parent element. The child will be centered both horizontally and vertically. The generator produces this CSS for you.
What is the difference between justify-content and align-items?
justify-content positions items along the main axis (the flex-direction), while align-items positions them along the cross axis. When flex-direction is row, justify-content controls horizontal spacing and align-items controls vertical alignment.
When should I use Flexbox instead of Grid?
Use Flexbox for one-dimensional layouts — a single row or column, such as a navbar or button group. Use CSS Grid for two-dimensional layouts with both rows and columns, like page templates and galleries.
What does flex-wrap do?
flex-wrap controls whether items stay on one line (nowrap) or wrap onto multiple lines (wrap) when there is not enough space. Wrapping is essential for responsive rows of cards or tags.
Is the gap property supported in flexbox?
Yes. The gap property works in flexbox in all modern browsers and is the cleanest way to space items evenly without adding margins.
Does Flexbox work in all browsers?
Yes. Flexbox is supported in every modern browser, including all current versions of Chrome, Edge, Firefox, and Safari.

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