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Use Flexbox when items need to flow and share space along one axis—a row or a column. Use CSS Grid when you need to coordinate rows and columns together. Neither is reserved for a particular component or page size: choose by the relationships your layout must preserve, and combine the two when different parts of the design have different needs.
CSS Grid vs. Flexbox at a glance
| Decision | Flexbox | CSS Grid |
|---|---|---|
| Dimensions | One axis at a time: a row or a column. | Two dimensions: rows and columns together. |
| How you define the layout | Content and available space influence how items size and distribute themselves along the chosen axis. | You define tracks, then place items in them or let auto-placement fill the grid. |
| Wrapped items | Items can form multiple lines, but each line distributes its items independently. | Shared tracks coordinate item positions across rows and columns. |
| Best signal | Items should flow, grow, shrink, align, or spread along one direction. | Items need shared row or column alignment, explicit tracks, or placement across two dimensions. |
MDN describes Flexbox as one-dimensional and Grid as two-dimensional. The distinction is about how a layout handles relationships, not a rule that one tool is only for small components and the other only for whole pages. MDN’s overview of Grid’s relationship to other layout methods and its overview of Flexbox’s relationship to other methods explain these complementary approaches.
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When should you use Flexbox?
Choose Flexbox when the primary relationship is along a single direction. It is a natural fit for a navigation row, toolbar, button group, or vertical stack of controls when the items need to align or share the available space along that row or column. These are common examples, not exclusive prescriptions.
Flexbox is content-out: item content and the space available affect sizing and distribution. That makes it useful when the items themselves should influence how much room they take, rather than requiring every item to occupy a position in a shared two-dimensional track system.
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When should you use CSS Grid?
Choose Grid when positions need to line up across both rows and columns. For example, in a card gallery, Grid can define shared columns so cards in different rows remain aligned. You can establish tracks explicitly and place items within them, or use auto-placement to fill the grid.
A useful warning sign is Flexbox code that assigns widths to items mainly to make wrapped rows line up with one another. Flexbox lines distribute independently; if cross-row alignment is a requirement, Grid’s shared tracks are usually the more direct tool.
Can you use Grid and Flexbox together?
Yes. Use each where its layout model fits: a page structure can use Grid for its coordinated regions, while a navigation group inside one region uses Flexbox to lay out its items in a row. The reverse nesting is also valid: a Flexbox item can be a Grid container. Grid and Flexbox overlap in some jobs, but neither replaces the other; the outer and inner arrangements may simply have different needs. CSS-Tricks’ discussion of whether Grid replaces Flexbox covers their continuing complementary roles.
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Both can be used in responsive layouts. Let the available space and content guide the arrangement, then introduce a breakpoint when the content becomes cramped or the layout stops being suitable. MDN’s responsive web design guide describes adapting layouts at the point where content needs a change rather than targeting every device size individually.
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Check the actual browser versions and CSS features your project must support. A historical rollout date is not a substitute for that check: CSS-Tricks reported that unprefixed Grid had shipped broadly in major browsers by March 2017, but that is historical context, not a current feature-by-feature compatibility assessment.
A practical decision process
- Identify the relationship. If items mainly flow along one row or column, start with Flexbox. If alignment across rows and columns matters, start with Grid.
- Check how wrapping should behave. If each new Flexbox line can arrange itself independently, wrapping may work well. If items in separate rows must share aligned columns, use Grid tracks.
- Choose by need, not scale. A small component may need Grid, and a larger page region may need Flexbox. There is no component-size rule.
- Compose where appropriate. Nest Flexbox inside a Grid item, or make a Flexbox item a Grid container, when the inner and outer relationships differ.
- Test the responsive result. Adjust where the actual content becomes cramped or unsuitable, and verify the browser versions the project serves.
Further reading
For a broad CSS reference that covers both layout systems, O’Reilly publishes CSS: The Definitive Guide, 5th Edition by Eric Meyer and Estelle Weyl. Its Grid chapter is also available in the publisher’s Grid Layout excerpt. A book is not required to use either CSS feature.
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