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Category: Developer tools

CSS Flexbox Generator

System ideaMissing a tool?

Build a flex container visually and copy the CSS

Set flex-direction, flex-wrap, justify-content, align-items and gap on a live preview built from real flex items, then copy the finished container declaration. Nothing here leaves your browser.

Output
.container {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  justify-content: flex-start;
  align-items: stretch;
  gap: 12px;
}

Everything on this page is processed in your browser. Nothing is uploaded.

What this tool does

Flexbox has five properties that interact — direction flips what "main axis" even means for wrap and justify-content — which is why it is faster to see a change than to picture it. This tool keeps a real flex container on screen with numbered items inside it, so every option is judged against how the boxes actually move rather than against a mental model of the spec.

How to use it

  1. Set flex-direction and flex-wrap.
  2. Choose justify-content and align-items, and adjust the gap and item count.
  3. Copy the finished .container rule into your stylesheet.

Privacy

This tool runs entirely in your browser. Your input is never uploaded, stored or shared — closing the tab removes it.

Frequently asked questions

Is the preview a real flex layout?
Yes. The numbered boxes are laid out with the exact CSS you are setting, not a picture of one, so what you see is what the copied rule produces.
Why does changing flex-direction change what justify-content does?
justify-content always works along the main axis, and flex-direction is what decides whether the main axis is horizontal or vertical. Switching to column turns "justify" from left/right into top/bottom.
Is anything about my layout uploaded?
No. The CSS is text assembled in the page from the controls you set, and the preview is rendered locally.

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