CSS Flexbox (Flexible Box Layout) is a one-dimensional layout model for distributing space among items in a container. It excels at aligning items horizontally or vertically, distributing extra space, and handling dynamic content sizes. It replaced many float and table-based layout hacks.

When should I use Flexbox vs Grid?

Use Flexbox for one-dimensional layouts — a single row or column of items. Use CSS Grid for two-dimensional layouts where you need control over both rows and columns simultaneously. Flexbox is ideal for navigation bars, card rows, centering content, and form layouts.

What is the difference between justify-content and align-items?

justify-content controls spacing along the main axis (horizontal in row direction, vertical in column). align-items controls alignment along the cross axis (perpendicular to main). Together they give you full 2D positioning control within the flex container.

What does flex: 1 mean?

flex: 1 is shorthand for flex-grow: 1, flex-shrink: 1, flex-basis: 0%. It makes an item grow to fill available space equally with other flex: 1 siblings. Two items with flex: 1 each take 50% of the container width.

Is Flexbox supported in all browsers?

Yes, Flexbox is supported in all modern browsers including Chrome, Firefox, Safari, Edge, and mobile browsers. No vendor prefixes are needed. It has been universally supported since 2015.

How do I center an element with Flexbox?

Set the parent to display: flex, then use justify-content: center and align-items: center. This centers the child both horizontally and vertically — the most reliable centering method in CSS.

Free tool

CSS Flexbox Generator

Build flexbox layouts visually. Adjust direction, wrapping, alignment, and gap in real-time, then copy production-ready CSS and HTML.

100% free
No sign-up
Clear controls
Open and use

Direction

Wrap

Justify Content

Align Items

Gap8px

Items4

Preview

CSS Output

css

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

HTML Output

html

<div class="container">
  <div class="item">1</div>
  <div class="item">2</div>
  <div class="item">3</div>
  <div class="item">4</div>
</div>

What this tool does

Visual live preview
All flex properties
Adjustable item count
Copy CSS + HTML
100% browser — no upload

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The short version

What is CSS Flexbox Generator?

A CSS Flexbox generator is a visual tool for building flexible box layouts without memorizing property combinations.

Flexbox is a one-dimensional CSS layout model that distributes space between items in a container along a main axis and cross axis. This tool lets you configure all flex container properties — direction, wrapping, alignment, justification, and gap — with a live preview showing exactly how items arrange. You also control child item properties like flex-grow, shrink, and order. The output is production-ready CSS or Tailwind utility classes.

CSS Flexbox Generator showing a worked example — Visual flexbox layout builder. Configure direction, wrap, alignment and gap with live preview. — CSS Flexbox Generator with the built-in example loaded. Free, no sign-up, and the result appears as you type.

Step by step

How to use CSS Flexbox Generator

1
Set container properties
Choose flex-direction (row/column), flex-wrap, justify-content, and align-items. Adjust the gap between items. The live preview updates instantly.
2
Configure child items
Add or remove child items. Set individual flex-grow, flex-shrink, flex-basis, and order values for each item to control sizing and sequencing.
3
Copy the code
Click "Copy CSS" for the container and item styles, or "Copy Tailwind" for utility classes. Paste directly into your project.

What's inside

Everything this tool
does for you

All flex container properties: direction, wrap, justify, align, gap
Individual child item controls: grow, shrink, basis, order
Live visual preview with configurable item count
CSS and Tailwind CSS output formats
Copy to clipboard with one click
Responsive-friendly layout generation
Visual alignment guides and labels
Runs in your browser — no server calls needed

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Questions

Frequently asked questions

Beyond this tool

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What is CSS Flexbox Generator?

How to use CSS Flexbox Generator

Set container properties

Configure child items

Copy the code

Everything this tooldoes for you

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Frequently asked questions

What is CSS Flexbox?

When should I use Flexbox vs Grid?

What is the difference between justify-content and align-items?

What does flex: 1 mean?

Is Flexbox supported in all browsers?

How do I center an element with Flexbox?

See the full picture for your website.

Everything this tool
does for you