Flexbox Layout Visualiser
Configure flexbox properties visually and copy the CSS code
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About Flexbox Layout Visualiser
See Flexbox in Action Before Writing a Single Line of CSS
Flexbox transformed CSS layout by making it possible to distribute space and align items within a container without resorting to floats or positioning tricks. But even experienced developers sometimes struggle to predict how justify-content, align-items, flex-wrap, and flex-grow interact with each other. The Flexbox Layout Visualiser solves this by letting you toggle every flexbox property and instantly see the result on a live preview, building muscle memory and intuition for the most important layout tool in modern CSS.
Every Flexbox Property at Your Fingertips
The tool presents every container-level and item-level flexbox property as an interactive control. On the container side, you can adjust flex-direction (row, column, row-reverse, column-reverse), flex-wrap (nowrap, wrap, wrap-reverse), justify-content (flex-start, center, flex-end, space-between, space-around, space-evenly), align-items, and align-content. On the item side, you can set flex-grow, flex-shrink, flex-basis, order, and align-self for individual items. The Flexbox Layout Visualiser updates the preview in real time as you change any property.
Add, Remove, and Resize Items
Start with a default set of flex items and then customise the scenario to match your real-world layout challenge. Add more items to see how wrapping behaves. Remove items to test how remaining ones fill the available space. Resize individual items by changing their width or height to observe how flex-grow and flex-shrink distribute extra or insufficient space. This hands-on experimentation is the fastest path to truly understanding flexbox behaviour.
The justify-content vs align-items Confusion
One of the most common flexbox questions is the difference between justify-content and align-items. The answer changes depending on the flex direction, which makes it even more confusing. The Flexbox Layout Visualiser clears this up permanently. Switch the direction from row to column and watch the axes swap. See justify-content suddenly control vertical distribution while align-items controls horizontal alignment. Once you see it happen visually, the concept clicks in a way that reading documentation alone cannot achieve.
Real Layout Scenarios
The tool includes preset layout templates for common design patterns: a navigation bar with a logo and menu items, a card grid that wraps responsively, a holy grail layout with header, footer, and three-column body, a centered modal dialog, and a sticky footer that stays at the bottom regardless of content height. Load any preset, study the property values that create it, and then modify them to match your specific design requirements.
Generated CSS You Can Actually Use
As you manipulate the visual controls, the Flexbox Layout Visualiser generates clean CSS in a code panel that updates live. Only the properties you have explicitly changed from their defaults are included, keeping the output minimal and readable. Copy the CSS for the container, the items, or both, and paste directly into your project. There is no bloat, no unnecessary resets, and no vendor prefixes needed since flexbox enjoys near-universal browser support.
A Teaching Tool for Teams and Classrooms
If you teach web development or mentor junior developers, the Flexbox Layout Visualiser is an invaluable teaching aid. Share your screen, change properties one at a time, and let students see the cause-and-effect relationship instantly. It turns an abstract CSS specification into a tangible, interactive experience. Many developers who have used flexbox for years report that visual tools like this one still teach them something new about edge cases they had never encountered.
No Installation, No Cost
The Flexbox Layout Visualiser runs entirely in your browser with no dependencies to install and no account to create. Bookmark it and open it whenever you need to prototype a layout, settle a debate about flex properties, or teach someone how flexbox works. It is always free and always private.