Flexbox Playground

flex-direction

Main axis direction

justify-content

Alignment along main axis

align-items

Alignment along cross axis

flex-wrap

Allow items to wrap

align-content

Multi-line alignment (requires wrap)

gap

Space between items

10px

Number of Items

Item Sizes

Vary sizes to see flex behavior

flex-grow (all items)

How items grow to fill space

flex-shrink (all items)

How items shrink when space is tight

Live Preview

CSS Code

Flexbox Quick Reference

flex-direction: Sets the main axis (row = horizontal, column = vertical)
justify-content: Distributes items along the main axis
align-items: Aligns items along the cross axis
flex-wrap: Controls whether items wrap to new lines
gap: Sets spacing between flex items (modern browsers)
flex-grow: How much an item should grow relative to siblings
flex-shrink: How much an item should shrink when space is limited

Privacy & Limitations

All calculations run entirely in your browser -- nothing is sent to any server.
Results are computed locally and should be verified for critical applications.

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Flexbox Playground FAQ

What is Flexbox Playground?

Flexbox Playground is a free developer tools tool that helps you Interactive CSS flexbox layout builder with live preview.

How do I use Flexbox Playground?

Enter your input values, review the calculated output, and adjust inputs until you reach the result you need. The result updates in your browser.

Is Flexbox Playground private?

Yes. Calculations run locally in your browser. Inputs are not uploaded to a server by default, and refreshing the page clears session data.

Does Flexbox Playground require an account or installation?

No. You can use this tool directly in your browser without sign-up or software installation.

How accurate are results from Flexbox Playground?

This tool applies standard formulas or deterministic processing logic for estimates. For medical, legal, tax, or investment decisions, verify with a qualified professional.

Can I save or share outputs from Flexbox Playground?

You can bookmark this page and copy outputs manually. Results are not persisted in your account and are typically not embedded in the URL.