CSS Flexbox & Grid Generator with Live Preview
Configure Flexbox and CSS Grid layouts visually and copy the exact CSS with this free online layout generator. Toggle direction, wrapping, alignment, and gaps for Flexbox — or define columns, rows, and areas for Grid — while a live preview shows precisely how items will flow.
Even experienced developers pause on justify-content versus align-items or the difference between auto-fit and auto-fill. This generator removes the guesswork: click through the options, watch real boxes rearrange, and copy boilerplate CSS that works the first time.
How to Generate Flexbox or Grid CSS
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Pick Flexbox or Grid
Choose the layout model that matches your problem — one-dimensional flows (Flexbox) or two-dimensional layouts (Grid).
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Configure visually
Toggle direction, justify/align values, wrap behavior, gaps, and column/row definitions with instant preview.
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Adjust item count
Add or remove preview items to see how the layout responds to real content quantities.
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Copy the CSS
Grab the generated container (and item) rules and paste them into your stylesheet.
Features of the Layout Generator
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Both layout systems
Flexbox and CSS Grid in one tool, so you can compare approaches for the same design.
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Every alignment property
justify-content, align-items, align-content, gaps, and per-item overrides — all clickable.
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Live, honest preview
Real DOM boxes rearrange as you change settings, matching exactly what your browser will do.
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Copy-ready boilerplate
Clean CSS output with only the properties you actually set.
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Great for learning
Seeing values change live is the fastest way to finally internalize Flexbox and Grid.
Frequently Asked Questions
When should I use Flexbox vs CSS Grid?
Use Flexbox for one-dimensional layouts — a row of buttons, a navbar, vertically centering content. Use Grid for two-dimensional layouts where rows and columns must align — page shells, card galleries, dashboards. They also combine well: Grid for the page, Flexbox inside components.
What is the difference between justify-content and align-items?
In Flexbox, justify-content distributes items along the main axis (horizontal in a row) while align-items aligns them on the cross axis (vertical in a row). If flex-direction is column, the axes swap — which is why a live preview helps.
How do I center a div with Flexbox?
Set the parent to display: flex; justify-content: center; align-items: center;. That centers the child both horizontally and vertically — the generator produces this exact snippet.
What does grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)) do?
It creates a responsive grid that fits as many 250px-minimum columns as the container allows, stretching them to fill remaining space — the classic no-media-query responsive card layout.