Yes, completely free with no signup required.

Does my data leave my device?

No. Everything runs in your browser — nothing is sent to any server.

Does it work on mobile?

Yes. The tool is mobile-first and works on any modern browser including iOS Safari and Android Chrome.

Configure flexbox properties visually, see an instant preview, and copy the generated CSS.

100% client-side · no upload

flex-direction flex-wrap justify-content align-items

Item count (1–8)

Choose the flex-direction, justify-content, align-items, and flex-wrap from the dropdowns.
Adjust the item count to see how the container handles different numbers of children.
Click Copy CSS to copy the generated flexbox CSS.

Is this tool free?: Yes, completely free with no signup required.
Does my data leave my device?: No. Everything runs in your browser — nothing is sent to any server.
Does it work on mobile?: Yes. The tool is mobile-first and works on any modern browser including iOS Safari and Android Chrome.