Use the free Layout Grid Builder below: your data never leaves your browser — all work happens on your device, and nothing is uploaded to any server.
What a layout grid actually does
Every clean-looking page you admire sits on a grid, whether you can see it or not. A grid is a set of invisible columns, gaps and margins that decides where text, images and buttons are allowed to sit. When elements align to the same columns, the page feels calm and intentional. When every element starts at a slightly different x-position, the page feels messy, even if the visitor cannot explain why.
The Layout Grid Builder above makes that invisible structure visible. You set the number of columns, the gap between them, the page margins and the page width, and the preview updates live. Below the preview you get the exact column width and a CSS snippet you can copy into your project. It is a planning tool, not a page builder: it answers the question “what grid should this design use?” before you write any layout code.
How to plan a grid
Start with the page width. A common content width for desktop is between 960 and 1200 pixels. Wider pages suit image-heavy designs, narrower pages suit long reading text, because lines longer than about 75 characters tire the eyes. Set that first, because column width depends on it.
Next, choose the column count. Twelve columns is the classic choice for web design, because twelve divides evenly by two, three, four and six, which gives you flexible layouts from the same grid. Six columns is simpler and often enough for a basic page. Four columns suits a compact layout, and two columns suits a simple article with a sidebar.
Then set the gap. The gap, also called the gutter, is the space between columns. A gap of 16 to 24 pixels is a safe default for most screens. Smaller gaps feel dense and editorial, larger gaps feel airy and premium. Finally, set the margins, the space between the grid and the edge of the page. Margins of 24 pixels or more stop content feeling cramped against the screen edge on smaller windows.
Read the column width result. If it drops below about 60 pixels, your text columns will be too narrow for comfortable reading, so reduce the column count or increase the page width. If it rises above 200 pixels, you may have too few columns for a rich layout.
Common grid patterns
A blog usually uses a wide main column spanning eight of twelve columns and a sidebar spanning four. A product page might use a six-column image area and a six-column details area. A gallery often uses four equal columns, each spanning three of twelve. A dashboard may use a narrow navigation column and a wide content area. All of these are the same grid with different spans, which is why planning the grid first keeps a whole site consistent.
Consistency is the real payoff. When every page shares one grid, visitors learn where to look, and new pages take less design effort because the structure already exists. Teams also argue less about alignment when the grid settles the question in advance.
Grids on small screens
Grids change with screen size. A twelve-column desktop grid usually collapses to four columns on a tablet and two on a phone, with smaller gaps and margins. Plan those breakpoints early: decide which columns stack and which merge, rather than letting elements squeeze. Text columns should never shrink below readable width just to preserve a desktop layout. On a phone, a single column with generous margins beats a squeezed multi-column layout every time.
Frequently asked questions
How many columns should I use? Twelve for flexible web layouts, six for simpler pages, four for compact designs. More columns give more layout options, but also more decisions.
What is the difference between gap and margin? The gap is the space between columns inside the layout. The margin is the space between the outer columns and the edge of the page. Both matter, and both are shown in this tool.
Can I use the CSS output directly? Yes. The snippet uses standard CSS grid, which works in all modern browsers, and you can adjust the values to match your design system.
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