CSS Flexbox Generator

Configure Flexbox settings and export clean CSS instantly.

CSS Flexbox Generator

Configure Flexbox container settings and export clean CSS with a preview.
Example: .nav, #toolbar, .cards. This becomes the selector for the generated CSS.
Preview & CSS
Preview updates as you change settings. Generate to export the CSS block.
1
2
3
4
5
6
7
8
Tip: enable wrapping and reduce your browser width to see multi-line behavior.
No CSS generated yet
Set your options and click Generate CSS to produce a copy-ready snippet.

About CSS Flexbox Generator

CSS Flexbox Generator — Build Flexbox Layout CSS in Seconds

Flexbox is one of the fastest ways to build responsive layouts, but remembering every property/value pair (and how they interact) can slow you down. This CSS Flexbox Generator helps you configure a flex container visually and instantly outputs clean, copy-ready CSS for your project. Choose direction, wrapping, alignment, and spacing—then copy or download the final code.

Whether you’re building a navigation bar, a card grid, a hero layout, or a UI component library, the tool gives you a reliable baseline so you can focus on design decisions instead of syntax.

How It Works

The generator maps your selections to the core Flexbox container properties—display, flex-direction, flex-wrap, justify-content, align-items, align-content, and gap. When you submit the form, the tool produces a single CSS block that you can paste into a stylesheet, a CSS module, or a component-scoped style tag.

In addition, the on-page preview updates so you can sanity-check your choices. This makes it easy to experiment with alignment rules, confirm spacing, and understand how wrap and alignment behave together—especially when your container has multiple rows.

What you do

  • Select layout direction: Row, column, or reversed variations for left-to-right, top-to-bottom, and mirrored layouts.
  • Choose wrapping: Keep items on one line or allow wrapping into multiple lines/columns.
  • Set alignment: Control distribution on the main axis (justify-content) and cross axis (align-items), plus multi-line alignment (align-content).
  • Define spacing: Use gap, row-gap, and column-gap for clean, consistent space between items.
  • Copy or download CSS: Export your final configuration instantly.

Key Features

All essential Flexbox container settings

Configure the most important container-level Flexbox properties in one place. The output always includes display: flex and then adds your chosen layout rules in a predictable order. That makes the generated CSS easy to read and easy to diff in code review.

Responsive-friendly spacing with gap

Instead of relying on margins on children (which can complicate edge cases), you can generate layouts using gap, row-gap, and column-gap. This is often cleaner for grids of cards, button clusters, and icon toolbars.

Optional vendor prefixes

If you want a conservative snippet for older environments, you can enable vendor prefixes. Modern browsers handle Flexbox well, but prefixes can still be useful for legacy builds or embedded webviews where you don’t control the runtime.

Live preview mindset

Flexbox can be counterintuitive until you see it. The tool includes a preview panel with sample items so you can quickly test distribution, wrapping, and cross-axis alignment—without leaving your editor.

Copy and download workflows

Copy the generated CSS with one click, or download a plain .css file. This is handy when you want to store layout presets, share a snippet with teammates, or keep a personal “layout cookbook” for common UI patterns.

Use Cases

  • Navigation bars: Align logo, links, and actions with consistent spacing and predictable centering.
  • Card layouts: Wrap cards into rows, set uniform gaps, and tune distribution without hacks.
  • Button groups and toolbars: Keep controls aligned and evenly spaced across screen sizes.
  • Centering content: Create classic “center both axes” layouts for empty states, loaders, and modals.
  • Dashboards: Combine row direction with wrap and gaps to build responsive widget areas.
  • Design systems: Save consistent Flexbox presets for reusable components.

Flexbox shines when you need one-dimensional layout control (a row or a column) with flexible distribution. With this generator, you can create those patterns quickly, then refine them to match your design tokens and breakpoints.

Optimization Tips

Know your main axis first

Flexbox alignment depends on the main axis, which is controlled by flex-direction. In row, justify-content distributes items horizontally; in column, it distributes vertically. Decide your axis first, then tune distribution and cross-axis alignment.

Use gap over margins for grids

Margins can create tricky edge behavior (extra space on the outer perimeter, last-row surprises, and complicated overrides). For many UI patterns, gap keeps spacing consistent and reduces special cases. When you do need outer padding, put it on the container rather than the children.

Wrap + align-content is a pair

align-content only matters when there are multiple flex lines (i.e., when wrapping is enabled and items actually wrap). If you’re not wrapping, change align-items instead. A lot of confusion disappears when you remember this rule.

FAQ

align-items aligns items within a single flex line on the cross axis. align-content aligns the set of flex lines when there are multiple lines (typically with wrapping). If you only have one line, align-content won’t change much.

Use gap when you want consistent spacing between items without adding extra rules to children. Margins are still useful for asymmetric layouts or when you need different spacing per item, but gap often produces cleaner, more maintainable code.

This tool focuses on container properties because that’s where most layout behavior is defined. You can still add item rules like flex, flex-basis, or align-self manually after you paste the snippet.

Align-content only applies when items form multiple lines. Turn on wrapping and make sure there are enough items (or narrow enough container width) for wrapping to occur. Otherwise, align-content won’t visibly change the layout.

Yes. Copy the declaration block and paste it into a CSS module, a component stylesheet, or translate the values into utility classes. Many teams use this tool to quickly decide values, then port them to their preferred styling system.

Why Choose This Tool

Flexbox is powerful, but it’s also easy to second-guess yourself when layouts don’t behave as expected. A generator gives you fast feedback and reduces the “trial-and-error loop” that usually happens across DevTools, docs, and your editor. By concentrating the essential properties into one interface, you can explore options confidently and keep your focus on the outcome.

Just as importantly, the output is clean and reusable. Save common patterns—centered stacks, evenly spaced rows, wrapped card layouts—and treat them as building blocks. Over time you’ll develop a reliable set of presets that match your design system and help you ship UI faster.