CSS Flexbox Generator
Visual flexbox layout code generator with direction, wrap, justify, and align settings.
Configure inputs and click Run
How It Works & Educational Guide
How Nexifr's CSS Flexbox Generator handles your data securely in the browser — covering supported formats, encoding standards, and practical developer workflows.
01What is CSS Flexbox and Why Use a Generator?
CSS Flexbox (Flexible Box Layout) is a one-dimensional layout model that allows you to align and distribute space among items within a container, even when their sizes are unknown or dynamic. It is the most widely used CSS layout technique for building navigation bars, card grids, centering content, and creating responsive UI components. A flexbox generator removes the need to memorise the full flexbox specification. Instead of manually writing properties like 'display: flex; flex-direction: row; justify-content: space-between;', you select values from intuitive dropdowns and copy the auto-generated code directly into your stylesheet.
02Understanding Key Flexbox Properties
• flex-direction: Defines the main axis. 'row' lays items left-to-right (default), 'column' stacks them top-to-bottom. The '-reverse' variants invert the order. • flex-wrap: Controls whether items stay on one line (nowrap) or wrap to additional lines (wrap) when they overflow the container width. • justify-content: Distributes items along the main axis. Options include flex-start, flex-end, center, space-between (maximum gaps), space-around (equal outer space), and space-evenly. • align-items: Aligns items along the cross axis. 'center' is the most common — it vertically centres items within the flex container. • gap: Sets consistent spacing between flex items without using margins, making it the cleanest way to add gutters in modern layouts.
03Practical Flexbox Layout Patterns
Here are the most commonly needed flexbox patterns: • Horizontal Centring: display: flex; justify-content: center; align-items: center; — The classic 'centre anything' trick. • Navigation Bar: display: flex; flex-direction: row; justify-content: space-between; — Logo on the left, links on the right. • Card Grid Row: display: flex; flex-wrap: wrap; gap: 16px; — Cards flow left-to-right and wrap to new rows automatically. • Vertical Stack: display: flex; flex-direction: column; gap: 8px; — Stacks form fields, buttons, or list items vertically with consistent spacing. • Equal-Width Columns: Add flex: 1 to each child inside the flex container to make all columns share space equally regardless of content.
Frequently Asked Questions
What is a CSS flexbox generator?
A CSS flexbox generator is a visual tool that lets you configure flexbox layout properties — direction, wrapping, alignment, justification, and gap — through simple dropdowns, then automatically outputs the corresponding CSS code. It removes the need to memorise flexbox property names and values, making it far faster to build responsive web layouts.
Does this generate responsive code?
The tool generates a complete, copy-ready CSS flexbox declaration. For full responsiveness, wrap the output in media queries (e.g. @media (max-width: 768px)) to adjust the flex direction or alignment at different screen sizes. Most developers start with a row layout on desktop and switch to column on mobile.
What is the difference between justify-content and align-items?
justify-content controls how flex items are distributed along the main axis (horizontal in a row layout). align-items controls how items are aligned along the cross axis (vertical in a row layout). For example, justify-content: space-between spreads items horizontally, while align-items: center vertically centres them within the container.
When should I use flexbox vs CSS Grid?
Use Flexbox when you are laying out items in a single direction — either a row or a column. It excels at navigation bars, button groups, and centering content. Use CSS Grid when you need a two-dimensional layout with explicit rows and columns, such as a full page layout or a card grid.
Is the generated CSS compatible with all browsers?
Yes. CSS Flexbox has been supported in all modern browsers (Chrome, Firefox, Safari, Edge) since 2015 and has over 99% global browser support. The generated code uses standard, unprefixed flexbox properties that work universally without any polyfills.