CSS Grid & Flexbox Layout Generator Online Free
Toggle between CSS Grid and Flexbox, adjust columns, rows, gaps, alignment, wrapping, and justification through plain form controls, and watch a live preview rearrange colored sample blocks in real time. The panel below the preview emits clean, copy-ready CSS for .container so you can paste a working layout skeleton into any stylesheet without memorizing every alignment keyword.
CSS Grid & Flexbox Layout Generator In-Browser Workspace
Input data or select files to begin. 100% private, client-side execution with zero server transmission.
How to Use CSS Grid & Flexbox Layout Generator
- Step 1: Choose CSS Grid or CSS Flexbox with the mode buttons at the top.
- Step 2: For Grid, set template columns/rows, column and row gaps, and justify-items / align-items; for Flexbox, set direction, wrap, justify-content, align-items, align-content, and gap.
- Step 3: Pick a preview item count (3, 4, 6, 8, or 9) to see how the arrangement behaves with different content volumes.
- Step 4: Compare the live preview against your intended design and fine-tune until the blocks land correctly.
- Step 5: Click Copy CSS and paste the generated .container rule into your project stylesheet.
About CSS Grid & Flexbox Layout Generator
Flexbox is a one-dimensional layout model: you place items along a single main axis (row or column) and use justify-content to distribute free space on that axis while align-items controls the cross axis. When content wraps, align-content arranges the lines themselves. Grid is two-dimensional: grid-template-columns and grid-template-rows define track lines, and items span cells formed by their intersections. justify-items and align-items position content inside each grid area, while gap (split into column-gap and row-gap) inserts gutters without the margin-collapse pitfalls of older float layouts. The classic decision rule is simple — use Flexbox for components (nav bars, button groups, card footers where one dimension dominates) and Grid for page-level structure (sidebars, card grids, dashboards). Fraction units (1fr) divide available space after fixed tracks are subtracted, so repeat(3, 1fr) always yields three equal columns regardless of content width. The preview applies your exact CSS values as React inline styles, which means what you copy is byte-for-byte what you validated. Modern browser support for both models exceeds 98% global usage, so neither requires prefixes for the properties exposed here.
Frequently Asked Questions
Grid or Flexbox — which should I use?
Use Flexbox when content size drives the layout (toolbars, inline lists, centered heroes). Use Grid when you need rows and columns to align (image galleries, app shells, pricing tables). They also compose: a Grid page can contain Flexbox components.
What does 1fr mean in grid-template-columns?
One fractional unit = one share of the leftover space after fixed (px/rem) tracks are subtracted. repeat(3, 1fr) splits remaining width into three equal parts and reflows automatically.
Does gap work in flexbox?
Yes — flexbox gap is supported in all evergreen browsers since 2021 and is now the recommended replacement for sibling margins, avoiding the first-child margin edge cases.
Can I copy more than just the .container rule?
The generator emits the container properties only, which is the part people most often mistype. Child items inherit normal flow; add your own card styles on top as needed.
Does the preview require a server or upload my code?
No. Styles are applied as React inline objects on sample divs entirely client-side. The CSS string is built locally and copied via the Clipboard API.