CSS Flexbox Generator — Visual Flexbox Layout Builder & Code

CSS Flexbox Generator — Visual Layout Builder

This CSS Flexbox generator lets you design flex layouts visually and export production-ready CSS. Adjust every container and item property in real time — the preview updates instantly so you see exactly how your layout will behave.

How to Use

Choose a preset — start with Centered, Space Between, Grid-Like, Sidebar, or Holy Grail
Tune container properties — flex-direction, flex-wrap, justify-content, align-items, align-content, gap
Set the item count — add 1–8 items to the preview
Select an item — click a box in the preview to configure its flex-grow, flex-shrink, flex-basis, align-self, and order
Copy the CSS — grab just the container, a single item, or the full block

Understanding Flexbox Properties

Container properties control how items are laid out as a group:

flex-direction — main axis direction: row (left-to-right), row-reverse, column (top-to-bottom), or column-reverse
flex-wrap — nowrap keeps everything on one line; wrap overflows items to the next line
justify-content — main-axis spacing: flex-start, center, flex-end, space-between, space-around, space-evenly
align-items — cross-axis alignment for all items: stretch, center, flex-start, flex-end, baseline
align-content — cross-axis alignment when there are multiple rows (only active with wrap)
gap — shorthand for row-gap and column-gap between items

Item properties override or extend the container behavior per element:

flex-grow — how much extra space the item absorbs (0 = no growth; 1 = equal share; 2 = double share)
flex-shrink — how much the item compresses below its basis (0 = no shrink; default 1)
flex-basis — the starting size before space distribution: auto, a pixel value, or a calc() expression
align-self — overrides the container’s align-items for this specific item
order — moves items without changing the HTML; lower numbers appear first

Privacy

All layout calculations and CSS generation run entirely in your browser. No data is sent to any server.

FAQ

What is CSS Flexbox?

CSS Flexbox (Flexible Box Layout) is a one-dimensional layout model that distributes space and aligns items in a container. The container controls direction, wrapping, and spacing; individual items can override alignment and set their own grow/shrink ratios.

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

justify-content distributes items along the main axis (horizontal for row, vertical for column). align-items aligns items along the cross axis (the perpendicular direction). To center items both ways, use justify-content: center and align-items: center together.

When should I use flex-grow vs flex-basis?

flex-basis sets the initial size of an item before free space is distributed. flex-grow controls how much of the remaining space an item takes relative to siblings. A common pattern: flex-basis: 0 with flex-grow: 1 gives each item an equal share of all available space.

What does flex-wrap do?

By default (nowrap), flex items shrink to fit a single line. With flex-wrap: wrap, items that do not fit wrap to the next line. This is the foundation of responsive grid-like layouts without a grid container.