What is CSS Flexbox and why should I use it?

Flexbox (Flexible Box Layout) is a one-dimensional CSS layout method for arranging items in rows or columns with flexible sizing and powerful alignment. It's perfect for navigation bars, card layouts, centering content, and distributing space between items.

How do I create a Flexbox layout online?

Set container properties (flex-direction, justify-content, align-items, flex-wrap, gap), add flex items with individual properties (flex-grow, flex-shrink, flex-basis, align-self), preview the layout in real-time, and copy the generated CSS code.

When should I use Flexbox vs CSS Grid?

Use Flexbox for one-dimensional layouts (row OR column) - navigation bars, button groups, card rows, centering. Use Grid for two-dimensional layouts (rows AND columns) - page layouts, dashboards. They work great together: Grid for layout, Flexbox for components.

What is flex-direction and how does it work?

flex-direction sets the main axis direction: row (horizontal, left-to-right), row-reverse (right-to-left), column (vertical, top-to-bottom), column-reverse (bottom-to-top). This determines how justify-content and align-items behave.

What is justify-content in Flexbox?

justify-content aligns items along the main axis. Values: flex-start (pack at start), flex-end (pack at end), center (center items), space-between (equal space between items), space-around (equal space around items), space-evenly (equal space everywhere).

What is align-items in Flexbox?

align-items aligns items along the cross axis (perpendicular to main axis). Values: stretch (fill container height), flex-start (align to start), flex-end (align to end), center (center vertically), baseline (align text baselines).

What is flex-wrap and when should I use it?

flex-wrap controls whether items wrap to new lines when they don't fit. nowrap (default) keeps items on one line. wrap allows items to wrap to multiple lines. wrap-reverse wraps in reverse order. Essential for responsive layouts.

How do I center content with Flexbox?

Use justify-content: center and align-items: center on the container to center items both horizontally and vertically. This is the easiest way to center content in CSS. Works for single items or groups of items.

What is the gap property in Flexbox?

gap sets spacing between flex items without affecting outer edges. Cleaner than margins. Use row-gap and column-gap separately, or shorthand "gap: 16px". Supported in all modern browsers. Replaces margin hacks for spacing.

What is flex-grow and how does it work?

flex-grow determines how extra space is distributed among items. Default is 0 (don't grow). A value of 1 makes items share extra space equally. Higher values get proportionally more space. Example: items with flex-grow 1, 2, 1 get 25%, 50%, 25% of extra space.

What is flex-shrink and how does it work?

flex-shrink determines how items shrink when there's not enough space. Default is 1 (shrink equally). A value of 0 prevents shrinking. Higher values shrink more. Useful for keeping certain items (like icons) at fixed size.

What is flex-basis and how is it different from width?

flex-basis sets the initial size of a flex item before growing or shrinking. Common values: auto (use content/width), 0 (ignore content size), percentages, or fixed values. Unlike width, flex-basis respects flex-grow and flex-shrink.

What does flex: 1 mean?

flex: 1 is shorthand for flex-grow: 1, flex-shrink: 1, flex-basis: 0%. Items will grow equally to fill available space, ignoring their content size. Common pattern for equal-width columns or filling remaining space.

What is align-self in Flexbox?

align-self overrides align-items for individual items, allowing different cross-axis alignment per item. Values: auto (use container's align-items), flex-start, flex-end, center, baseline, stretch. Great for exceptions in a row.

Is my Flexbox configuration secure when using this tool?

Yes! All Flexbox generation happens 100% in your browser using JavaScript. Your layout configurations are NEVER sent to any server, stored, or logged. The tool works completely offline for maximum privacy.

What is CSS Flexbox and why should I use it?

Flexbox (Flexible Box Layout) is a one-dimensional CSS layout method for arranging items in rows or columns with flexible sizing and powerful alignment. It's perfect for navigation bars, card layouts, centering content, and distributing space between items.

How do I create a Flexbox layout online?

Set container properties (flex-direction, justify-content, align-items, flex-wrap, gap), add flex items with individual properties (flex-grow, flex-shrink, flex-basis, align-self), preview the layout in real-time, and copy the generated CSS code.

When should I use Flexbox vs CSS Grid?

Use Flexbox for one-dimensional layouts (row OR column) - navigation bars, button groups, card rows, centering. Use Grid for two-dimensional layouts (rows AND columns) - page layouts, dashboards. They work great together: Grid for layout, Flexbox for components.

What is flex-direction and how does it work?

flex-direction sets the main axis direction: row (horizontal, left-to-right), row-reverse (right-to-left), column (vertical, top-to-bottom), column-reverse (bottom-to-top). This determines how justify-content and align-items behave.

What is justify-content in Flexbox?

justify-content aligns items along the main axis. Values: flex-start (pack at start), flex-end (pack at end), center (center items), space-between (equal space between items), space-around (equal space around items), space-evenly (equal space everywhere).

What is align-items in Flexbox?

align-items aligns items along the cross axis (perpendicular to main axis). Values: stretch (fill container height), flex-start (align to start), flex-end (align to end), center (center vertically), baseline (align text baselines).

What is flex-wrap and when should I use it?

flex-wrap controls whether items wrap to new lines when they don't fit. nowrap (default) keeps items on one line. wrap allows items to wrap to multiple lines. wrap-reverse wraps in reverse order. Essential for responsive layouts.

How do I center content with Flexbox?

Use justify-content: center and align-items: center on the container to center items both horizontally and vertically. This is the easiest way to center content in CSS. Works for single items or groups of items.

What is the gap property in Flexbox?

gap sets spacing between flex items without affecting outer edges. Cleaner than margins. Use row-gap and column-gap separately, or shorthand "gap: 16px". Supported in all modern browsers. Replaces margin hacks for spacing.

What is flex-grow and how does it work?

flex-grow determines how extra space is distributed among items. Default is 0 (don't grow). A value of 1 makes items share extra space equally. Higher values get proportionally more space. Example: items with flex-grow 1, 2, 1 get 25%, 50%, 25% of extra space.

What is flex-shrink and how does it work?

flex-shrink determines how items shrink when there's not enough space. Default is 1 (shrink equally). A value of 0 prevents shrinking. Higher values shrink more. Useful for keeping certain items (like icons) at fixed size.

What is flex-basis and how is it different from width?

flex-basis sets the initial size of a flex item before growing or shrinking. Common values: auto (use content/width), 0 (ignore content size), percentages, or fixed values. Unlike width, flex-basis respects flex-grow and flex-shrink.

What does flex: 1 mean?

flex: 1 is shorthand for flex-grow: 1, flex-shrink: 1, flex-basis: 0%. Items will grow equally to fill available space, ignoring their content size. Common pattern for equal-width columns or filling remaining space.

What is align-self in Flexbox?

align-self overrides align-items for individual items, allowing different cross-axis alignment per item. Values: auto (use container's align-items), flex-start, flex-end, center, baseline, stretch. Great for exceptions in a row.

Is my Flexbox configuration secure when using this tool?

Yes! All Flexbox generation happens 100% in your browser using JavaScript. Your layout configurations are NEVER sent to any server, stored, or logged. The tool works completely offline for maximum privacy.

Flexbox Generator

medium

Visual Flexbox playground with live preview. Configure flex container and item properties, see results instantly, and export CSS code.

Web Developmentcssflexboxlayoutgenerator

100% Private - Runs Locally

How to Use

1Set flex properties
2Add flex items
3Preview layout
4Copy CSS code

Examples

Center Content

Input

Center horizontally and vertically

Output

.flex-container {
  display: flex;
  justify-content: center;
  align-items: center;
}

Navigation Bar

Input

Logo left, nav right

Output

.flex-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.logo {
  flex: 0 0 auto;
}

.nav-links {
  flex: 1 1 auto;
}

Equal Columns

Input

Three equal-width columns

Output

.flex-container {
  display: flex;
  gap: 24px;
}

.column {
  flex: 1 1 0%;
}

Card Grid

Input

Responsive card layout

Output

.flex-container {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.card {
  flex: 0 0 calc(33.33% - 16px);
}

Sticky Footer

Input

Footer at bottom

Output

.flex-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.content {
  flex: 1 1 auto;
}

.footer {
  flex: 0 0 auto;
}

Sidebar Layout

Input

Fixed sidebar with flexible content

Output

.flex-container {
  display: flex;
}

.sidebar {
  flex: 0 0 250px;
}

.main-content {
  flex: 1 1 auto;
}

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