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CSS Grid Generator — Visual Layout Builder

Generate responsive CSS Grid layouts with flexible 1fr units and auto-fit patterns. Live preview with adjustable gaps. No media queries needed.

No limitsZero data leaksSuper fast
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12px
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display: grid;
grid-template-columns: repeat(3, 1fr);
grid-template-rows: repeat(2, 1fr);
gap: 12px;

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About this tool

Why 1fr Is Not a Percentage

The fr unit is the most common grid mistake. grid-template-columns: 1fr 1fr 1fr divides space after gaps and fixed tracks are subtracted. Three equal 1fr columns with a 12px gap fit perfectly inside 100% width. Three 33.33% columns with the same gap overflow, because percentage is calculated against the container, not the remaining space.

This generator uses 1fr so you see the difference: set 3 columns, add a gap, and items still fit. You can edit column counts without overflow math—that is the entire point of fr.

Responsive Grids Without Media Queries

The responsive toggle emits repeat(auto-fit, minmax(120px, 1fr)). This pattern creates as many columns as fit the container, reflows automatically on resize, and needs zero breakpoints. Adjust "Min column width" to control when the grid reflows—a smaller minimum means more columns at the same viewport width.

This tool generates both patterns: fixed-count grids (for layouts where you need exactly 3 columns) and responsive auto-fit grids (for card collections that resize themselves). Copy the responsive snippet and change 120px to your smallest acceptable item width.

auto-fit vs. auto-fill: When It Matters

auto-fit collapses empty tracks and stretches items to fill the row. auto-fill keeps empty tracks narrow so items stay their minimum size. When you have fewer items than fit the row, auto-fit makes them bigger; auto-fill leaves them cramped. This tool uses auto-fit; if you need auto-fill behaviour (keep all items the same size even if the row has space), edit the CSS directly.

What This Generator Does Not Expose

Grid areas (naming regions via grid-template-areas), explicit placement (telling items which row or column to occupy), subgrid (nested grids that inherit parent tracks), and alignment fine-tuning (justify-items, align-content) are omitted. gap applies between tracks only, never on the container edge. For layouts requiring named areas or subgrid, write CSS directly. The flexbox generator covers one-dimensional layouts, which are often the simpler fit.

How to use the CSS Grid Generator

Takes about a minute. No signup, no download, your data stays in your browser.

  1. 1
    Open the tool. Scroll up to the CSS Grid Generator above — it loads instantly in your browser, no install needed.
  2. 2
    Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
  3. 3
    Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.

Frequently asked questions

Common questions about the CSS Grid Generator.

What is the fr unit in CSS Grid?

The fr unit means fraction, and it distributes leftover container space after fixed-size tracks and gaps are subtracted. Three columns of 1fr with a gap still fit inside 100% width, unlike three 33.33% columns, which overflow because the gap is added on top of a total that already fills the container.

How do I make a responsive grid without media queries?

Use repeat(auto-fit, minmax(200px, 1fr)) where 200px is your minimum item width. The grid creates as many columns as fit and reflows automatically on viewport changes, so no breakpoints are needed. Lower the minimum for more columns, raise it for fewer.

What is the difference between auto-fit and auto-fill?

auto-fit collapses empty tracks so items stretch to fill the row. auto-fill keeps those empty tracks so items stay at their minimum size. The two behave identically once the row is full, and differ only when you have fewer items than would fit.

Why does my grid overflow when I use percentages?

Percentage width is calculated against the container total, not the space remaining after gaps. A 12px gap plus three 33.33% columns exceeds 100% and overflows. Use fr units instead, which let the browser subtract the gaps before dividing what is left.

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