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Flexbox Generator
Set flexbox properties visually with a live preview and copy the CSS.
Updated July 13, 2026
How to use the flexbox generator
- 1Choose flex-direction, justify-content, align-items, and wrap.
- 2Adjust the gap and the number of preview items.
- 3Watch the preview reflow to match.
- 4Copy the CSS onto your flex container.
Common uses
- Centering content vertically and horizontally
- Building a responsive nav bar or toolbar
- Learning what each flexbox property does
- Prototyping a layout before writing code
Frequently asked questions
What's the difference between justify-content and align-items?
justify-content aligns items along the main axis (the direction set by flex-direction), while align-items aligns them along the cross axis. In a row, justify-content is horizontal and align-items is vertical; switch to a column and they swap. The live preview makes the difference obvious.
When should I use Flexbox vs Grid?
Flexbox is one-dimensional, a single row or column of items that can wrap. CSS Grid is two-dimensional, rows and columns together. Use Flexbox for toolbars, nav bars, and centering; use Grid for page layouts and card grids. Many designs combine both.
Does the copied CSS go on the container or the items?
On the container, the element that wraps the items. The generated '.container' rule includes display: flex plus the properties you set. The child items need no special CSS to participate, though you can add flex-grow or flex-basis to them separately.
About this tool
The Flexbox generator turns the CSS flexbox properties into visual controls with a live, reflowing preview. Adjust flex-direction, justify-content, align-items, flex-wrap, and gap, add or remove preview items, and watch the layout update instantly, then copy clean CSS for the container. It's the fastest way to remember which property does what: justify-content aligns along the main axis, align-items across it, and flex-direction decides which axis is which. For two-dimensional layouts, the CSS Grid generator is the companion. Everything runs in your browser.
Like most tools on UtilityBase, the flexbox generator runs entirely in your browser. Nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more developer tools here.
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