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CSS Grid Generator

Building a CSS Grid layout from memory means juggling grid-template-columns, grid-template-rows, gap, justify-items, align-items, and a half-dozen other properties whose names are easy to confuse with each other after a long workday. FixTools lets you set those values through visual sliders, dropdowns, and number inputs, then copies the finished ruleset straight to your clipboard in production-ready form. No coding required, no browser quirks to guess at, no fr versus percentage math to redo, and no grid syntax to memorise before you can start prototyping. The live preview updates the instant you change a value, so every adjustment is verified visually before you paste a single line into your stylesheet.

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Set column count, gap, and row definitions visually

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Generates grid-template-columns and gap properties

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Live preview updates as you adjust controls

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What CSS Grid Is and Why a Visual Generator Gets You There Faster

CSS Grid is a two-dimensional layout system built into every modern browser, and it represents the first time the language has had a first-class mechanism for controlling rows and columns from the container itself. Unlike Flexbox, which arranges items along a single axis and lets each item negotiate its own size against its siblings, Grid lets you define the entire structure of a layout in one declaration on the parent. You set the column tracks with grid-template-columns, the row tracks with grid-template-rows, and the spacing between them with gap. Items placed inside the container automatically fill those tracks in source order, or you can position them explicitly using grid-column and grid-row, named lines, or the grid-area property. For page-level layouts, image galleries, dashboards, and any structure where both axes matter, Grid is the purpose-built tool and using anything else creates extra work for no benefit.

A visual CSS Grid generator works by letting you adjust column count, column widths, gap size, row definitions, and alignment values through interface controls rather than by hand-editing property values inside a stylesheet. As you change a control, the generator recalculates the grid-template-columns string and shows a live preview of the column tracks with sample child elements inside. You can see exactly how an fr unit responds when the container narrows, how the gap affects column proportions, and how align-items changes the vertical placement of items inside their tracks. When the layout matches what you need, you click Copy CSS. The output is production-ready: a container ruleset with display grid, the correct grid-template-columns value, the gap, any row definitions you specified, and the alignment properties, all written in standard CSS that every browser parses without preprocessing or framework wrappers.

Grid is the right choice for any layout where rows and columns need to align across the page or component. An image gallery where thumbnails line up in both dimensions is the textbook example, but the same logic applies to a dashboard where cards sit in a defined grid, a pricing page where features and prices stack into a tidy comparison table, or a page skeleton where a header, sidebar, main content, and footer occupy named regions. If your layout only needs to arrange items in a single direction along one axis, Flexbox is simpler and produces tidier CSS. For anything that requires explicit two-dimensional control, choose Grid. The visual generator removes the friction of learning the syntax before you can prototype, which means you can decide between Grid and Flexbox by trying both on the same content rather than guessing from documentation.

Beyond raw productivity, the generator also functions as a teaching tool. Developers who reach for Grid only occasionally tend to forget the exact spelling of grid-template-columns, the difference between justify-items and justify-content, or which property takes a length and which takes a keyword. Each time you build a layout in the generator, the connection between the visual outcome and the property name reinforces itself, so the next time you need to write the CSS by hand you remember the syntax without checking documentation. Designers who do not write CSS regularly benefit even more, because the generator lets them deliver a working stylesheet to engineers rather than a static mockup that has to be re-implemented from measurements. Both groups end up with the same code, generated in seconds, and the same predictable browser behaviour.

MDN: CSS Grid Layout CSS Tricks: A Complete Guide to Grid

How to use this tool

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Open the Grid Generator, set your column count and gap values, adjust row heights if needed, and click Copy CSS. Paste the ruleset into your stylesheet and the layout is ready.

How It Works

Step-by-step guide to css grid generator:

1
Set your column count
Open the Grid Generator and use the column count control to set the number of columns your layout needs, anywhere from a simple two-column split up to a twelve-column editorial grid. The preview redraws instantly so you can confirm the column structure visually before adjusting any other property. Sample items appear inside each new track to make the column boundaries obvious at any container width.
2
Adjust column widths
Set each column to a fixed pixel width, a percentage, an fr unit, or a minmax range to control how columns share the available container space. Mixing units is allowed and is exactly how production grids handle fixed sidebars paired with flexible content columns. Watch the preview as you change each track and confirm the proportions match the wireframe or design you are working from.
3
Set the gap
Enter a gap value for the space between columns and rows. The generator applies the same gap to both axes by default, or you can split it into separate row-gap and column-gap values when your design needs more vertical breathing room than horizontal spacing. The browser subtracts gap before fr units are computed, so set the gap early to avoid recalculating column proportions later.
4
Copy the CSS
Click Copy CSS to copy the finished ruleset, including display grid, grid-template-columns, gap, and any row or alignment values you set. Paste it directly into your stylesheet on the container selector that wraps your grid items. The output is plain CSS with no framework dependencies, so it slots into Tailwind, vanilla projects, or any build pipeline without modification.

Real-world examples

Common situations where this approach makes a real difference:

Portfolio image gallery

A photographer sets up a three-column grid with a 16px gap using the generator for a portfolio landing page. The tool outputs repeat(3, 1fr) with gap: 16px, which the photographer pastes into the gallery container selector. All thumbnail images line up in both dimensions with consistent spacing, and no floats, absolute positioning, or third-party masonry library are needed. When the design later calls for four columns on wider monitors, the photographer reopens the generator, increases the column count, and replaces the single declaration in seconds without touching any of the surrounding card or image styles.

Admin dashboard layout

A developer building an analytics dashboard uses the generator to create a four-column grid with a 24px gap for the metrics row at the top of the page. The stat cards fill the first row automatically in source order, and the larger chart component below spans two columns using a grid-column: span 2 override added after copying the base container CSS. The generator output remains the canonical source for the container ruleset, while the spanning declarations live on individual card classes, which keeps the layout logic predictable and easy to scan in a pull request review.

Product card listing

An e-commerce developer generates a five-column grid with a 20px column gap and 32px row gap for the category page. The generated CSS uses separate column-gap and row-gap values, giving product cards more vertical breathing room than horizontal spacing between them. The tighter horizontal gap maximises product visibility per row while the extra vertical space prevents the cards from feeling cramped when the description text wraps onto two or three lines for products with longer titles. The merchandiser approves the spacing in the preview before any code is committed.

Editorial content grid

A content designer building a magazine-style page uses the generator to produce a twelve-column grid with a 16px gap as the underlying structure. Individual articles then span two, three, four, or six columns using grid-column span values, creating a varied editorial layout where featured stories occupy half the width and supporting stories sit in smaller tracks alongside. The consistent twelve-column base ensures that every spanning value still snaps to the same vertical rhythm, which is the secret to making magazine layouts look intentional rather than chaotic.

When to use this guide

Use this when you need to produce a CSS Grid layout quickly without memorising grid-template-columns syntax or debugging fr unit calculations manually.

Pro tips

Get better results with these expert suggestions:

Use fr units for flexible columns

Setting columns to fr units, such as 1fr 2fr 1fr or repeat(4, 1fr), lets the browser calculate exact pixel widths at any container size without any media query intervention from you. A fixed-pixel grid breaks the moment the viewport falls below the sum of the column widths plus gaps, while an fr-based grid adapts automatically because the browser recalculates the available space on every reflow. Reserve pixel values for tracks that must stay a specific size, such as a 240px sidebar.

Set gap before finalising column widths

Gap space is subtracted from the container width before fr units are calculated, so changing the gap after you finalise your column proportions shifts every fr column by a few pixels. Set your gap value first, then adjust column fr values to match your design. This avoids the common situation where the layout looks correct at the viewport size you tested initially but feels too tight at a wider or narrower size because gap consumed more pixels than expected on smaller screens.

Preview at multiple container widths

Resize the preview area to narrow widths after generating the CSS and watch how columns respond. If columns become too narrow at 600px container width, add a media query that switches to a two-column or single-column grid for that breakpoint. The generator output gives you the desktop template; a few additional lines inside a @media block handle the rest. Mobile testing in the preview catches issues that would otherwise only surface after deployment when a real user opens the page.

Name the container class before copying

The generated CSS uses a generic container selector by default. Before pasting into your stylesheet, replace it with your actual class name, such as .product-grid or .dashboard-row, so you do not have to do a find-and-replace later inside a larger file where the generic selector might clash with other rules. This small habit prevents specificity bugs that only appear once the page picks up styles from a global design system or component library.

FAQ

Frequently asked questions

grid-template-columns defines the number and width of the columns in a grid container. You list the size of each column separated by spaces, so the value 200px 1fr 200px creates a three-column grid with fixed sidebars and a flexible centre column that absorbs all remaining space. The value repeat(3, 1fr) is shorthand for three equal-width columns. The function repeat(auto-fill, minmax(240px, 1fr)) creates as many columns as fit, where each is at least 240px wide. Every item placed in the container fills the next available column track in source order unless you position it explicitly with grid-column or grid-area. The property accepts any combination of length units, percentages, fr units, minmax ranges, and named line markers.

fr stands for fraction, and it represents a share of the available space in the grid container after fixed-size columns and gaps are subtracted. In a container that is 900px wide with a gap of 20px between three tracks, the layout 1fr 2fr 1fr gives columns of approximately 210px, 420px, and 210px because the four total fr shares split the 860px of remaining space. The fr unit is the standard way to create proportional columns in CSS Grid because, unlike percentages, it correctly accounts for gap values. Using percentages for column widths in a grid with gaps causes the columns to overflow the container by the total gap width, which is why fr is almost always the right choice.

Grid is two-dimensional: it controls both rows and columns from the container in a single declaration. Flexbox is one-dimensional: it arranges items along a main axis, either horizontally or vertically, and treats the cross axis as a secondary alignment concern. Grid starts from the container and defines slots that items fill; Flexbox starts from the items and sizes them relative to each other and the available space. Use Grid for page-level structure and any layout where items must align on both axes simultaneously, such as image galleries and dashboards. Use Flexbox for single-row or single-column component layouts such as navigation bars, button groups, and form rows where items should flow naturally.

Yes. CSS Grid has been supported in Chrome, Firefox, Safari, and Edge since March 2017, which means every reasonably current browser handles it without any special syntax. It works without vendor prefixes in all currently shipping browser versions, including mobile Safari and Samsung Internet on Android. If your project must still support Internet Explorer 11, be aware that IE11 implemented an older version of the Grid specification using the -ms- prefix and different property names, so a separate fallback stylesheet is the practical approach. For any audience using browsers from the past several years, Grid works reliably without prefixes, polyfills, or fallback layouts.

Yes, for many common patterns. Using repeat(auto-fill, minmax(250px, 1fr)) as your grid-template-columns value creates a grid that automatically adjusts its column count as the container width changes. No media queries are needed because the browser calculates the column count continuously: it adds columns when space allows, drops to fewer columns when the container narrows, and collapses to a single column at very small widths. This pattern is ideal for card grids, image galleries, and product listings. It is not the right approach for layouts where column positions need to change structurally at specific breakpoints, such as a sidebar moving from beside the content to above it, which still requires a media query.

gap, previously known as grid-gap before the property was unified across Grid and Flexbox, sets the spacing between grid tracks. You can provide one value to apply identical spacing to both row and column gaps, or two values to set row-gap and column-gap separately when your design needs more vertical breathing room than horizontal spacing. Gap is applied only between tracks, never around the outside of the grid, so it does not affect the distance between the grid container edge and the first or last item. To add outer spacing around the entire grid, use padding on the container or margin on the items, and reserve gap exclusively for internal spacing.

The generated CSS uses standard CSS Grid properties with no framework-specific syntax, which means it works alongside Bootstrap, Tailwind, Foundation, Bulma, and any other CSS framework or design system. If you use a framework that ships its own grid system, you may need to ensure the framework's grid utilities do not conflict with the generated container ruleset. Adding a specific class name to your container and wrapping the generated CSS inside that class avoids most conflicts, because the framework grid styles only apply where their utility classes are present. For Tailwind projects, the generator output can also live inside an @layer components block to slot cleanly into the framework's cascade order.

Yes. Copy the generated CSS and paste it inside a @media block to apply the grid layout only at specific viewport widths. A common pattern is to use a single-column block layout as the default for mobile devices and switch to the generated multi-column grid above a breakpoint, for example @media (min-width: 768px). This mobile-first approach is recommended because the smallest screens get the simplest CSS, and additional complexity loads only when the viewport can use it. The generator outputs the ruleset itself; you decide where in your stylesheet it lives, whether at the top level, inside a media query, or inside a container query for component-level responsiveness.

Yes, and nesting is one of the standard patterns for building complex page layouts. A grid item can itself become a grid container by adding display: grid and its own grid-template-columns value. The outer grid controls the placement of the inner grid container, while the inner grid arranges its own children independently. This is how a dashboard layout typically works: the outer grid creates header, sidebar, and main regions, then the main region becomes its own grid for the cards inside. Nested grids do not affect each other's alignment because each grid context is scoped to its container, so you can mix any number of nesting levels without unexpected interactions between them.

CSS Grid offers four alignment properties that combine to give you precise control. justify-items aligns all items horizontally within their cells, accepting start, end, center, or stretch. align-items aligns all items vertically within their cells, accepting the same values. justify-content and align-content control how the entire grid tracks are distributed within the container when there is extra space, accepting values such as start, center, space-between, and space-around. For one-off overrides on a single item, use justify-self and align-self on the child element itself, which takes precedence over the container-level alignment properties without affecting the alignment of any sibling items.