Free Online Flexbox Playground Tool

The Flexbox playground is an interactive sandbox for the flex container properties — `flex-direction`, `justify-content`, `align-items`, `flex-wrap`, `gap` — with a live preview.

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How to Use This Developer Tool

  1. Change the number of flex items and their displayed labels.
  2. Pick values for flex-direction, justify-content, align-items, flex-wrap, and gap.
  3. Watch the preview reflow.
  4. Copy the resulting CSS from the snippet below.

What Is a Flexbox Playground?

Flexbox lays out items along a main axis (row or column) and a cross axis. `justify-content` controls spacing along the main axis; `align-items` controls alignment on the cross axis. Once those two distinctions are intuitive, most layouts collapse to a single one-line container declaration.

This playground shows a flex container with a configurable number of items and dropdowns for each property. Change any value and the preview reflows immediately — the fastest way to build intuition for `space-between` versus `space-around`, or what happens when you flip `flex-direction` from row to column. The CSS for the container is shown below so you can copy what works.

Frequently Asked Questions

What is Flexbox?
Flexbox is a CSS layout mode for one-dimensional layouts (row or column). Flex items grow, shrink, and align. Great for nav bars, cards, forms.
What's the difference between justify and align?
justify-content: main axis (row = horizontal, column = vertical). align-items: cross axis. align-self overrides per item.
When to use Flexbox vs Grid?
Flexbox: 1D layouts, content-driven sizing, alignment. Grid: 2D layouts, explicit rows/columns.

Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.

Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.

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