⭐ 0
🔍
Text Image PDF & Docs Audio Music Electronics Time Utilities Validators Esoteric Games

CSS Flexbox Generator

Build a CSS flexbox layout visually: flex-direction, justify-content, align-items, flex-wrap and gap on the container, plus per-child flex-grow, flex-shrink and flex-basis, all with a live preview and copyable CSS.

🔒 Processed entirely in your browser — nothing you enter here is ever uploaded.

Processing... 0%

Result

A flexbox layout has two separate rulebooks — properties on the container (flex-direction, justify-content, align-items, flex-wrap, gap) and properties on each child (flex-grow, flex-shrink, flex-basis) — and mixing them up is the most common source of "why isn't this centering / growing / wrapping the way I expect" bugs. This generator puts both rulebooks on screen at once: change any container control or any child's own fields and three numbered, color-coded boxes update immediately, so cause and effect stay visible.

The container side covers every layout axis: pick a direction, choose how children are distributed along the main axis with justify-content, align them on the cross axis, decide whether they wrap onto new lines, and set a gap instead of margin hacks between them. The child side is just as real: add boxes up to eight, remove down to two, and give any of them their own flex-grow, flex-shrink and flex-basis — the generator only prints a per-child CSS rule when at least one of those differs from the browser default, so the copied code never pads itself with flex-grow: 0 on boxes that do not need it.

Preset pages jump straight to the layouts people actually search for by name: how to center a div (the single most-asked CSS layout question, solved with justify-content and align-items both set to center), a logo-left links-right navbar, equal-width flexible columns via flex-grow, and a side-by-side comparison of space-between against its close relatives space-around and space-evenly.

Like every tool on this site, the generator is free and runs entirely in your browser: no upload, no account, and it keeps working offline once the page has loaded.

Enjoying this tool? Think this product is useful? See potential in it and want to support it?

🛡️
Executed in Browser

Your files and inputs never leave this device. Processing runs completely offline. 100% Secure.

Accepted Formats & Rules

  • Container controls: flex-direction, justify-content, align-items, flex-wrap and a gap input in pixels, applied live to the preview.
  • Three color-coded child boxes by default (add up to eight, remove down to two), each with its own flex-grow, flex-shrink and flex-basis fields.
  • Copyable CSS block with a .flex-container rule plus one .flex-item-N rule per child that has non-default flex properties.

Key Benefits

✓ Every container control and every child's flex-grow, flex-shrink and flex-basis update three numbered preview boxes live, so you see exactly what your flexbox rules do before touching a stylesheet.
✓ The generator only prints child rules that actually differ from the CSS defaults, so the copied code stays short and readable instead of restating flex-grow: 0 on every box.
✓ Preset pages solve the layouts people search for by name: centering a div, a logo-left links-right navbar, and equal-width flexible columns — open one and the tool is already configured.

Use Cases

  • • Get the exact CSS to center a div both horizontally and vertically by watching justify-content and align-items work on live preview boxes.
  • • Build a logo-left, links-right navbar layout with space-between and align-items: center, then copy the container CSS straight into your header component.
  • • Compare space-between, space-around and space-evenly side by side on the same three boxes instead of guessing which one matches the spacing you want.