Breakpoint Planner
Set named breakpoints and generate mobile-first media queries and CSS variables, with a live indicator of your current viewport width.
Plan responsive breakpoints deliberately
Responsive design lives or dies by its breakpoints — the widths where the layout reflows. Copy-pasting the same
device numbers everywhere leads to inconsistency and forgotten queries. This planner gives you named, editable
breakpoints and generates the matching mobile-first min-width media queries plus CSS variables, so
every component references the same set.
The live indicator at the top shows your current viewport width and which breakpoint is active, which is handy for debugging as you resize. The defaults follow the widely used 640/768/1024/1280/1536 scale, but you can change any value — the best breakpoints are the widths where your own content starts to feel cramped, not arbitrary device sizes.
Copy-ready CSS
Generated live in your browser — nothing is uploaded.
Frequently Asked Questions
What are CSS breakpoints?
Breakpoints are the viewport widths where your layout changes via media queries — for example switching from a single column on phones to multiple columns on tablets and desktops.
Should I use min-width or max-width media queries?
A mobile-first approach uses min-width: styles apply from a width upward. It keeps CSS simpler and progressive. This planner generates min-width queries by default.
What breakpoint values are standard?
Popular defaults mirror Tailwind and Bootstrap: 640, 768, 1024, 1280, and 1536px. But the best breakpoints are the widths where your specific content starts to break, not fixed device sizes.
Is this tool free and private?
Yes. The media queries are generated in your browser — no sign-up and nothing uploaded.
Want a fully responsive build done for you? Let’s talk.