All tools

Flexbox Playground

CSS

Visual CSS flexbox builder with live preview and generated CSS

Drag `justify-content` and `align-items` sliders and watch preview boxes rearrange live, the fastest way to internalize flex alignment behavior instead of memorizing which property does what. Flex-direction toggles between row and column to show the same items reflowing along a different axis, flex-wrap and gap are both adjustable, and individual child items can get their own `flex-grow`, `flex-shrink`, and `align-self` values rather than only controlling the container. The generated CSS is plain, dependency-free flexbox syntax that copies straight into a real stylesheet. It's meant to make the visual behavior obvious quickly, not replace understanding the underlying properties: debugging a flex layout outside this tool still benefits from knowing what each property actually does.

flexboxcsslayoutvisual

How to use Flexbox Playground

  • 1.Adjust `justify-content` and `align-items` sliders and watch the preview boxes rearrange live to understand flex alignment.
  • 2.Toggle `flex-direction` between row and column to see how the same items reflow along a different axis.
  • 3.Copy the generated CSS once your layout looks right and paste it directly into your stylesheet.

Frequently asked questions

Does this generate real CSS I can use in production?
Yes, the generated CSS is standard flexbox syntax with no dependencies — copy it straight into your project.
Does it cover flex-wrap and gap?
Yes, wrap behavior and gap spacing are both adjustable and reflected in the live preview and generated CSS.
Can I control individual child items, not just the container?
Yes, you can set per-item properties like `flex-grow`, `flex-shrink`, and `align-self` on individual preview boxes.
Is this a replacement for learning flexbox?
No — it's meant to make the visual behavior obvious quickly, but understanding the underlying properties will still help you debug layouts outside this tool.

Use via API, SDK, or MCP

cURL# Free: 1,000 req/day · Pro: 10,000 req/day
curl -X POST https://api.utilix.tech/v1/tools/flexbox-css \
  -H "Authorization: Bearer utx_live_..." \
  -H "Content-Type: application/json" \
  -d '{"direction": "row", "justify": "space-between", "align": "center", "gap": "16px"}'

Get an API key from your dashboard · Full API docs →

Related tools

CSS Grid BuilderVisual CSS grid layout builder with live preview and presetsCSSBorder RadiusVisual CSS border-radius builder with live preview and presetsCSSBox ShadowVisual CSS box-shadow builder with multiple layers and presetsCSS