Flexbox Generator

How to use this tool

1. Enter values.
2. Generate CSS.
3. Copy result.

About Flexbox Generator

Use this Flexbox Generator for clear, copyable CSS.

Using Flexbox Generator with the right inputs

Use Flexbox Generator locally in your browser. Start by matching your task to the quantities and options shown below. The definitions of the inputs matter as much as the final number or transformed output; retain the original values so that you can repeat or check the result.

Inputs and options explained

• Direction: choose Row, Column, Row reverse, Column reverse.
• Justify content: choose Start, Center, End, Space between, Space around, Space evenly.
• Align items: choose Stretch, Start, Center, End, Baseline.
• Wrap: choose No wrap, Wrap, Wrap reverse.
• Gap (px): Enter the numeric value for this quantity using the units or scale shown in the label. The form indicates a minimum of 0.

Example to try in this tool

Use the following sample values to see how the controls and result fit together. They are an illustration of the operation, not recommended values for your own situation.

• Direction: Row
• Justify content: Start
• Align items: Stretch
• Wrap: No wrap
• Gap (px): 16

Select Generate Flexbox CSS. The result begins with:

Flexbox CSS

display: flex;

flex-direction: row;

justify-content: flex-start;

align-items: stretch;

This example records the tool’s output for those inputs. Check the method and assumptions against your own task before using a result; reproducing an example is not independent certification of the underlying model.

Interpretation and limitations

Keep a record of the input values and units with the result. Check that the definitions in the form match the question you are trying to answer. Rounding, different conventions and omitted assumptions can explain differences between otherwise similar calculations.

Before you use the output

• Choose the intended action: Generate Flexbox CSS. Re-run the operation after changing an input or mode so that you are checking the updated result.
• Read the result label and any accompanying explanation. Keep the input values or source file with the output so that a later comparison uses the same assumptions.
• If a result looks unexpected, check units, separators and selected options first. Try a smaller example you can verify rather than repeatedly changing several settings at once.

Questions or a result that needs checking?

If you find a discrepancy, report a problem with Flexbox Generator. Include a non-sensitive example, the selected options, the result you expected and the result shown. This makes the issue easier to reproduce. See About & privacy for how the site handles tool inputs.