Nifty

CSS Flexbox Generator with Live Preview

Build a CSS flexbox container with dropdowns for flex-direction, justify-content, align-items, flex-wrap and gap, watch a live preview update, and copy the ready CSS — runs 100% in your browser with no upload.

Live preview

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display: flex;
flex-direction: row;
justify-content: flex-start;
align-items: stretch;
flex-wrap: nowrap;
align-content: stretch;
gap: 8px;

🔒 Generated in your browser — nothing is uploaded.

What this flexbox generator does

CSS flexbox is the one-dimensional layout model that lets a container arrange its children along a row or a column. Pick a value for each core property — flex-direction to set the main axis, justify-content to distribute items along it, align-items to line them up across it, flex-wrap to allow or prevent wrapping, and a gap in pixels for the spacing between items. A live preview of numbered boxes reflows instantly with every change, so you can see exactly how each property behaves before you copy the code.

Copy-ready CSS output

The tool prints a ready-to-paste declaration block that always starts with display: flex and then lists your chosen flex-direction, justify-content, align-items, flex-wrap and gap. Drop the block straight into a class in your stylesheet or an inline style attribute on the container element. The output is deterministic, so the same selections always produce exactly the same CSS — handy for learning how the properties combine and for grabbing a correct starting point for any layout.

Frequently asked questions

What is the difference between justify-content and align-items?

justify-content distributes items along the main axis (the direction set by flex-direction), while align-items positions them along the cross axis. For a row, justify-content moves items left-to-right and align-items moves them top-to-bottom.

Why do some justify-content values look the same in my preview?

Values like space-between, space-around and space-evenly only differ visibly when items are smaller than the container and there is free space to distribute. With few items or a wrapping layout the spacing may look similar until there is room to spread them out.

Is anything I create uploaded to a server?

No. The live preview and the generated CSS are produced entirely in your browser with JavaScript. Your selections and the resulting flexbox code are never sent, stored or uploaded anywhere.