CSS Grid vs Flexbox: When to Use Each

CSS Grid and Flexbox are not competing tools. They are complementary. Grid is for two-dimensional layouts. Flexbox is for one-dimensional layouts. Understanding this difference makes choosing between them obvious.

Use Flexbox when you are arranging items in a single direction, either a row or a column. Navigation menus, button groups, and card layouts where items wrap naturally are perfect for Flexbox. It excels at distributing space and aligning items along one axis.

Use CSS Grid when you need precise control over both rows and columns. Page layouts, image galleries, and dashboard interfaces work better with Grid. You define the structure explicitly, and items slot into specific areas. This gives you more control but requires more upfront planning.

Flexbox is content-driven. Items size themselves based on their content, and Flexbox distributes the remaining space. This is great for UI components where you do not know the exact size of each item. A navigation menu might have three links or ten, and Flexbox handles both cases gracefully.

Grid is layout-driven. You define the grid structure first, then place items into it. This works well when you know the layout structure in advance. A three-column product grid stays three columns regardless of how much content each product has.

You can nest them. Use Grid for the overall page structure, then use Flexbox inside grid items for component layouts. A card in a grid might use Flexbox internally to arrange its header, content, and footer. This combination gives you the best of both tools.

Do not overthink it. If you are arranging things in a line, use Flexbox. If you need a grid, use Grid. Both are well-supported in modern browsers, and both are easier than the float-based layouts we used to rely on. Pick the tool that matches your layout needs, and your CSS will be simpler and more maintainable.