CSS Grid Generator | css3.com

How to Use the CSS Grid Generator

What Is the CSS Grid Generator?

The CSS Grid Generator is a free visual tool for building CSS Grid layouts without writing code from scratch. CSS Grid is the most powerful layout system in CSS - it enables you to create complex, two-dimensional layouts by defining rows and columns simultaneously. Unlike Flexbox (which works in one dimension), Grid gives you complete control over both horizontal and vertical placement of elements.

This tool lets you define the number of columns and rows, adjust gap spacing, and instantly see a live grid preview with numbered cells. The generated CSS code uses standard grid properties that work in all modern browsers, ready to copy or download into your project.

How Does It Work?

Start by setting the number of columns and rows using the sliders. The preview area immediately shows a grid with visual cells, each numbered sequentially so you can understand the layout at a glance. Adjust the column gap and row gap to control spacing between grid items - gaps can be set independently for horizontal and vertical spacing.

The generated CSS uses the grid-template-columns property with the repeat() function and the fr (fraction) unit, which divides available space equally. For example, 'grid-template-columns: repeat(3, 1fr)' creates three equal-width columns. The gap property sets uniform spacing between cells.

As you make adjustments, the preview updates in real-time, letting you experiment with different configurations visually before committing to code. When your layout looks right, copy the complete CSS or download it as a .css file.

CSS Grid Code Example

/* Basic 3-Column Grid */
.grid-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 16px;
}

/* Responsive Grid */
.responsive-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}

/* Named Grid Areas */
.layout {
  display: grid;
  grid-template-areas:
    "header header header"
    "sidebar main main"
    "footer footer footer";
}

Key CSS Grid Concepts

●grid-template-columns - defines the number and size of columns using values like px, fr (fraction), %, auto, or minmax()
●grid-template-rows - defines row sizes, works identically to column templates
●gap (or grid-gap) - sets spacing between grid items without affecting outer edges, replacing the need for margin hacks
●fr unit - the fractional unit divides remaining space proportionally; 1fr 2fr creates two columns where the second is twice as wide
●repeat() function - shorthand for repeating track sizes; repeat(4, 1fr) equals '1fr 1fr 1fr 1fr'
●auto-fill and auto-fit - enable responsive grids that automatically create columns based on available space using minmax()

When to Use CSS Grid vs Flexbox

CSS Grid and Flexbox are complementary technologies, not competitors. Use Grid when you need to control layout in two dimensions - placing items into both rows and columns simultaneously. This makes Grid ideal for overall page layouts, image galleries, dashboard widgets, and any design where items need to align in a true grid structure.

Use Flexbox when your layout is inherently one-dimensional - a row of navigation links, a column of stacked cards, or centering content within a container. Flexbox excels at distributing space along a single axis and handling dynamic content that may vary in size.

In practice, the best layouts combine both: Grid for the overall page structure and Flexbox for component-level alignment within grid cells. For example, you might use Grid to create a three-column layout and Flexbox inside each column to vertically center its content.