Auto-Fill vs. Auto-Fit in CSS Grid: What's the Difference?

Understanding the Distinction Between Auto-Fill and Auto-Fit in Grid Layouts

When working with CSS grids, you often encounter the terms "auto-fill" and "auto-fit" in the context of establishing a card-based grid layout. These properties determine how the grid handles scenarios where the available items may not completely fill the available space.

Auto-Fill vs. Auto-Fit

Both auto-fill and auto-fit create the specified number of grid tracks (columns or rows), but their behavior differs when the available items are insufficient to fill all the tracks.

• Auto-Fit: If there are not enough items to fill all the tracks, the empty tracks are collapsed, and the existing items expand to fill the freed space.
• Auto-Fill: Unlike auto-fit, empty tracks are preserved in auto-fill, resulting in a fixed grid layout, regardless of the number of items.

Impact on Card Display

In your card grid layout, using auto-fill instead of auto-fit will ensure that the cards remain displayed as separate entities even if there are only a few of them. By maintaining the fixed grid structure, auto-fill allows your cards to be evenly distributed and clearly separated.

Example

Consider the following code:

.wrapper {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
}

With auto-fill, the grid container will create as many columns as possible without overflowing the wrapper, whether or not there are enough cards to fill all the columns. The existing cards will be evenly spaced and displayed independently, preserving the card layout.

Conclusion

Choosing between auto-fill and auto-fit depends on the desired behavior in scenarios with varying item counts. Auto-fill is preferred for maintaining a consistent grid structure, while auto-fit collapses empty tracks to allow items to expand and fill the available space.

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