CSS Grid vs Flexbox: When to Use Which

CSS Grid and Flexbox are both powerful layout systems in modern CSS. They solve different problems and work best in different situations. Understanding when to use each one is essential for building clean, maintainable layouts.

The Key Difference

Flexbox is one-dimensional. It handles layout in a single direction: either a row or a column. Grid is two-dimensional. It handles layout in both rows and columns simultaneously.

When Flexbox Wins

Use Flexbox when you need to align items along a single axis. Navigation bars, button groups, and card rows are natural fits. Flexbox is also the right choice when the content should determine the layout size.

When Grid Wins

Use Grid when you need to control both rows and columns. Page layouts, dashboards, and any design that requires items to align in both directions benefit from Grid.

Flexbox in Practice

Flexbox works by distributing space along a single axis and providing alignment controls for the cross axis.

Flex Container Properties

The display: flex property on a container enables Flexbox. Control direction with flex-direction, wrapping with flex-wrap, and alignment with justify-content and align-items.

Flex Item Properties

Items inside a flex container can grow, shrink, and set a base size using the flex shorthand. The order property changes visual order without changing source order.

Common Flexbox Patterns

Centering content, creating equal-height columns, and building responsive navigation are all tasks where Flexbox excels with minimal code.

CSS Grid in Practice

CSS Grid defines explicit rows and columns, placing items into a structured grid.

Defining a Grid

Use display: grid and define tracks with grid-template-columns and grid-template-rows. The fr unit distributes available space proportionally.

Placing Items

Items can be placed automatically or explicitly. Use grid-column and grid-row to span specific tracks. Named grid areas provide a visual way to define layouts.

Responsive Grids

The auto-fill and auto-fit keywords combined with minmax() create responsive grids without media queries. Items wrap naturally as the container size changes.

Using Both Together

Grid and Flexbox complement each other. Use Grid for the overall page layout and Flexbox for components within grid areas.

Page Layout with Grid

Define the main page structure using Grid: header, sidebar, main content, and footer. Each area can then use Flexbox for its internal layout.

Component Layout with Flexbox

Inside a Grid area, use Flexbox for navigation menus, card content, form layouts, and other linear arrangements.

Decision Framework

Follow this simple decision process when choosing between Grid and Flexbox.

One Dimension or Two

If your layout only needs alignment in one direction, use Flexbox. If you need to align items in both rows and columns, use Grid.

Content-Out or Layout-In

If the content should drive the layout size, Flexbox is appropriate. If you have a predefined layout that content should fit into, Grid is the better choice.

Browser Support

Both Grid and Flexbox have excellent browser support. All modern browsers fully support both layout methods. Legacy browser support is only a concern for Internet Explorer, which has partial Grid support.

Conclusion

CSS Grid and Flexbox are complementary tools, not competitors. Use Flexbox for one-dimensional layouts and component-level alignment. Use Grid for two-dimensional layouts and page-level structure. Most real-world projects benefit from using both.