Flexbox Generator
Visual Flexbox layout builder with all flex properties. See changes in real-time.
Container Settings
Flex Items (3)
Presets
Preview Colors
Preview
.container {
display: flex;
flex-direction: row;
flex-wrap: nowrap;
justify-content: flex-start;
align-items: stretch;
align-content: stretch;
gap: 16px;
}What is a Flexbox Generator?
A Flexbox Generator is a visual layout builder that lets you interactively configure CSS Flexbox properties — like `justify-content`, `align-items`, `flex-wrap`, and `flex-direction` — and instantly preview the results in real-time. It outputs clean, ready-to-use CSS code for your flex container and items without manual trial-and-error. Developers use it to speed up building responsive, one-dimensional layouts like navbars, card grids, and hero sections.
How to Use This Tool
- 1 Set your container properties first: choose `flex-direction` (row or column), `flex-wrap` (wrap or nowrap), `justify-content` for main-axis alignment, and `align-items` for cross-axis alignment using the visual controls.
- 2 Add or remove flex items in the preview panel to match your actual component structure, then configure per-item properties like `flex-grow`, `flex-shrink`, `flex-basis`, and `order` for each child element.
- 3 Watch the live preview update as you adjust each property — verify spacing, alignment, and wrapping behavior looks correct across different container widths by resizing the preview area.
- 4 Copy the generated CSS output and paste it directly into your stylesheet, applying the container class to your parent element and item classes to its direct children in your HTML.
Common Use Cases
Navigation Bars
Use the generator to configure `justify-content: space-between` for logo and links, then set up a `flex-direction: column` breakpoint variant for mobile stacking — copying both CSS blocks directly into your responsive stylesheet.
Equal-Height Card Grids
Set `align-items: stretch` on the container and `flex: 1 1 300px` on items to create cards that grow equally and wrap naturally — the generator lets you fine-tune the `flex-basis` value until the card widths match your design.
Centered Hero Sections
Configure `justify-content: center`, `align-items: center`, and `min-height: 100vh` on the container to perfectly center hero content both horizontally and vertically, with the preview confirming alignment before you ship any code.
Sidebar and Content Layouts
Assign `flex: 0 0 260px` to the sidebar item and `flex: 1` to the main content area, then use the `order` property controls to visually move the sidebar below content on mobile without touching your HTML source order.
Tips & Best Practices
- → Always configure `flex-grow`, `flex-shrink`, and `flex-basis` on individual items — not just the container — since the default `flex: 0 1 auto` often causes uneven sizing that fixed-width values will break on smaller screens.
- → Use the generator for 1D layouts only: if you need items aligned across both rows and columns simultaneously, switch to a CSS Grid generator instead, as forcing 2D layouts with Flexbox causes unpredictable wrapping.
- → Check the generated CSS for `-webkit-` prefixes if you need Safari support, as some generators omit vendor prefixes — manually add `-webkit-flex-direction`, `-webkit-justify-content`, and related properties for full cross-browser compatibility.
- → Prefer relative `flex` values like `flex: 1` over fixed pixel widths in the item settings — this ensures items resize proportionally and your layout stays responsive without additional media query overrides.
Frequently Asked Questions
What is a Flexbox Generator? +
A Flexbox Generator is an online tool that lets you visually build and configure CSS Flexbox layouts by adjusting properties through a UI rather than writing code by hand. It generates the corresponding CSS for your flex container and items in real-time. Developers use it to eliminate guesswork and speed up building responsive components like navbars, card grids, and centered sections.
How do I use a Flexbox Generator online? +
Open the tool, configure your flex container properties (direction, wrapping, alignment) using the visual controls, then adjust individual item properties like `flex-grow` and `order` as needed. The live preview updates instantly so you can validate the layout before copying the generated CSS into your project. No account or installation is required — it runs entirely in the browser.
When should I use Flexbox instead of CSS Grid? +
Use Flexbox when your layout is one-dimensional — meaning you're aligning items along a single row or column, such as a navbar, button group, or card strip. CSS Grid is better suited for two-dimensional layouts where you need control over both rows and columns simultaneously, like a full page layout or a data table. The Flexbox Generator is ideal for component-level layouts, while Grid handles page-level structure.
How do I center content vertically and horizontally with Flexbox? +
Set `display: flex`, `justify-content: center`, and `align-items: center` on the container — add `min-height: 100vh` if you want the container to fill the full viewport height. In the generator, simply select 'center' for both the main-axis and cross-axis alignment dropdowns and the CSS is generated instantly. This is the most reliable cross-browser method for centering any content block.
Why aren't my flex items wrapping onto multiple lines? +
By default, Flexbox sets `flex-wrap: nowrap`, which forces all items onto a single line and causes overflow or shrinking instead of wrapping. In the generator, switch the `flex-wrap` property to `wrap` on the container, and items will flow onto new lines when they exceed the container width. Combine this with a `flex-basis` value on your items (e.g., `flex: 1 1 200px`) to control the minimum width before wrapping occurs.
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