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

justify-content arranges items along the main axis (horizontal in a row), while align-items arranges them along the cross axis (vertical in a row). Flip flex-direction and their roles swap.

Does it generate CSS for the container only?

Yes â the output is the container's display: flex block. Item-level properties like flex-grow are up to you.

Can I see a column layout?

Yes â choose column or column-reverse in the direction control and the preview rearranges instantly.

Is the generated CSS compatible with older browsers?

The output uses standard flexbox properties, which are supported in all modern browsers. For very old browsers you may need vendor prefixes.

Flexbox Generator: CSS Flexbox Builder

Quick Answer

A flexbox generator builds the CSS that controls a flex container — direction, alignment, wrapping and spacing — with a live preview of three sample items. When the layout looks right, copy the CSS.

What This Tool Does

Five controls — flex-direction, justify-content, align-items, flex-wrap and gap — drive a live preview of three colored items. The output is a complete flex container declaration you can paste into your stylesheet.

Key Features

Live preview — three sample items rearrange as you change any control.
All main properties — direction, justify, align, wrap, gap.
Copy-ready CSS — a complete container block, one click.
Zero dependencies — pure CSS output you can use anywhere.

How to Use the Flexbox Generator

Choose a direction (row or column).
Pick justify and align values, wrap, and a gap.
Watch the preview rearrange.
Click Copy CSS and paste it into your stylesheet.

Use Cases

Centering content the modern way.
Building nav bars, toolbars and card rows.
Learning what each flex property actually does.

Tips

justify-content works along the main axis; align-items works on the cross axis. Flip the direction and they swap roles.
Use gap instead of margins for spacing — it is supported everywhere modern.
For full control of item sizing, add flex-grow/shrink/basis to the items themselves.

Privacy

Everything runs locally; nothing is uploaded.

Conclusion

Flexbox is powerful but fiddly. Arrange items visually, copy the CSS, and get back to real work — free.

Flexbox Generator — Arrange Items Visually