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Experiment with flex-direction, justify-content, align-items, and gap while watching a live preview of sample items. Copy the generated flexbox CSS when you are ready.
How to use this tool
Change the selects and gap slider, then copy the generated flexbox CSS.
Worked example
Centered row with 12px gap.
How it works
Experiment with flex-direction, justify-content, align-items, and gap while watching a live preview of three sample items.
Limitations
Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.
Privacy and file handling
Your data stays on your device and is not uploaded.
FAQ
Frequently asked questions
Is Flexbox Visualizer free?
Yes. It is free to use and you do not need to sign in or create an account.
Is my data private?
See the privacy note on this page. Many tools run on your device; some heavier file tools may use secure temporary processing when required.
Can I use Flexbox Visualizer on mobile?
Yes. Open this page on your phone or tablet, enter your inputs, and use the on-screen controls.
Part of these workflows
This tool is one step in a longer job. Jump straight to your step or open the full workflow guide.
Related pages
- CSS UI generator tools — compare developer tools and read FAQs
- Ship a CSS UI tweak — step-by-step workflow
- Browse all free online tools on Utilnivo
- Explore more developer tools on Utilnivo
- CSS Grid Generator — Build CSS Grid templates with columns, rows, and gap.
- Border Radius Generator — Control each corner radius and copy CSS border-radius.
- Box Shadow Generator — Design CSS box shadows with live preview and copy-ready code.
- CSS Formatter and Minifier — Pretty-print or minify CSS in one panel—switch Format and Minify anytime.
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