Flexbox Generator
Build and preview CSS flexbox layouts visually with real-time updates. Set direction, wrap, alignment, gap, and sizing - then copy the production-ready CSS. Includes 8 layout presets, light and dark previews, and full control over all flexbox properties. Fully private, 100% free, and no signup required.
Layout Presets
Layout
Alignment
Sizing
Live Preview
CSS Output
The flexbox layout updates in real time as you adjust the controls. The CSS output includes both the container and item styles - ready to copy and paste into your project. All processing is 100% local and private.
Why Use Our Flexbox Generator?
Visual Flexbox Builder
The flexbox generator shows every property change in real time - adjust direction, wrap, alignment, and gap and see the layout update instantly on both light and dark backgrounds. No need to toggle between an editor and a browser to test flexbox layouts.
All Flexbox Properties
Control every CSS flexbox property - flex-direction, flex-wrap, justify-content, align-items, align-content, and gap. The flexbox generator also lets you adjust child element dimensions, container height, and the number of flex items for realistic testing.
100% Private - No Upload
All flexbox layout generation happens locally in your browser. Your layout configurations never leave your device and are never sent to any server - safe for client projects and proprietary design systems.
Free & No Limits
Build unlimited flexbox layouts with no signup, no subscription, and no usage caps. The flexbox generator is completely free forever with no ads blocking the interface.
Common Use Cases for Flexbox Generator
Front-End Layout Development
Frontend developers use the flexbox generator to prototype and fine-tune flexbox layouts without writing CSS by hand. Quickly test different alignment combinations, wrapping behaviour, and gap values to find the perfect layout for navigation bars, card grids, and content sections.
Responsive Design Testing
Designers and developers use the flexbox generator to test how flexbox layouts respond to different container sizes and wrapping configurations. The live preview makes it easy to visualise how items rearrange on smaller screens with wrap enabled.
Mobile App UI Layouts
Mobile developers use the flexbox generator to plan UI layouts for React Native, Flutter, and SwiftUI apps. Flexbox is the foundation of most mobile layout systems, and the visual builder makes it easy to experiment with different alignments.
Component Library Design
Design system engineers use the flexbox generator to define consistent layout patterns for component libraries. Test how flexbox properties affect nav bars, toolbars, button groups, and form layouts before committing to CSS code.
CSS Learning & Education
Students and educators use the flexbox generator to learn CSS flexbox interactively. See how changing justify-content from flex-start to space-between affects item distribution, or how align-items: stretch makes items fill the container height.
Coding Interview Preparation
Job seekers use the flexbox generator to practice and visualise flexbox concepts before frontend coding interviews. The visual feedback helps build intuition for flexbox properties and how they interact with each other.
Understanding CSS Flexbox Layout
What is CSS Flexbox?
CSS Flexbox (Flexible Box Layout) is a one-dimensional layout model that distributes space and aligns items within a container. Unlike block or inline layouts, flexbox gives you powerful control over direction, alignment, order, and sizing of child elements. The flexbox generator makes it easy to experiment with all flexbox properties visually, without writing CSS by hand.
How Our Flexbox Generator Works
- Choose a preset or build from scratch: Start with one of 8 layout presets (Default Row, Centered, Space Between, Space Around, Column Stack, Wrapping Grid, Center Column, End Aligned) or configure every flexbox property individually. All processing runs locally in your browser - your layout data never leaves your device.
- Adjust properties visually: Use the dropdowns and sliders to set flex-direction, flex-wrap, justify-content, align-items, align-content, and gap. The live preview shows coloured child elements updating in real time on both light and dark backgrounds so you can see exactly how your layout behaves.
- Copy the CSS: Click the CSS output to copy the complete flexbox CSS code, including the container and item styles. The generated CSS is clean, production-ready, and can be pasted directly into your stylesheets.
Flexbox Properties Explained
- flex-direction: Sets the main axis direction -
row(horizontal),row-reverse,column(vertical), orcolumn-reverse. This determines how items flow within the container. - justify-content: Controls alignment along the main axis. Use
flex-start,center,space-between,space-around, orspace-evenly. - align-items / align-content: Controls alignment along the cross axis.
align-itemsapplies to single-line layouts, whilealign-contentaffects multi-line (wrapping) layouts. - flex-wrap: Controls whether items wrap to a new line when they exceed the container width. Use
nowrap(single line),wrap(multi-line), orwrap-reverse.
Privacy, Security & Availability
The flexbox generator processes everything locally in your browser using JavaScript. Your layout configurations never leave your device - they are never uploaded, stored, or transmitted to any server. This makes it safe for confidential projects, client work, and proprietary design systems.
The tool is 100% free with no signup required, no usage limits, and no premium features hidden behind a paywall. All layout presets, alignment controls, and CSS export features are available to everyone at no cost.
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Frequently Asked Questions About Flexbox Generator
A flexbox generator is a visual tool that lets you create CSS flexbox layouts by adjusting properties through dropdowns, sliders, and buttons instead of writing code. Our flexbox generator shows a live preview of your layout as you change each property, making it easy to understand how flex-direction, justify-content, align-items, flex-wrap, and gap work together.
Start by choosing a layout preset or configuring the flexbox properties from scratch. Use the dropdowns to set direction and alignment, and the sliders to adjust gap, item sizes, and container height. The live preview updates instantly showing coloured child elements on both light and dark backgrounds. When you are happy with the layout, click "Show CSS" then "Copy CSS" to get the production-ready code.
The flexbox generator supports all major flexbox container properties: flex-direction (row, row-reverse, column, column-reverse), flex-wrap (nowrap, wrap, wrap-reverse), justify-content (6 values), align-items (5 values), align-content (7 values), and gap (0-40px). You can also control the number of child elements (2-8), their width and height, and the container height.
Yes. All flexbox layout generation happens 100% client-side in your browser using JavaScript. Your layout configurations are never sent to any server, never stored, and never transmitted anywhere. The flexbox generator is completely private and processes everything locally on your device.
justify-content controls alignment along the main axis (horizontal for row, vertical for column), distributing space between items. align-items controls alignment along the cross axis (vertical for row, horizontal for column), positioning items within the container height. The flexbox generator makes this visual by showing how items move when you switch between different values.
Yes. The flexbox generator is 100% free with no signup required, no premium features, and no usage limits. Generate unlimited layouts, use all 8 presets, adjust every flexbox property, and copy CSS as many times as you need without any restrictions or hidden costs. There are no ads blocking the interface.
CSS flexbox is supported in all modern browsers including Chrome 29+, Firefox 28+, Safari 9+, Edge 12+, and Opera 17+. Flexbox is one of the most widely supported modern CSS layout features and can be used confidently in production for all major browser versions.
Yes. The flexbox generator includes wrap controls that let you test how layouts behave when items wrap to new lines. By enabling flex-wrap: wrap and adjusting container dimensions and item sizes, you can see exactly how your layout would respond to different screen sizes - a key aspect of responsive web design.