Samsung Galaxy viewport sizes
Samsung phones default to either a 360px or a 384px wide layout, and about a third of people change the “Display size” setting, which changes the viewport again. Here is every current Galaxy phone with its default CSS viewport.
Try your site on every Samsung Galaxy size at once
Paste your address (or localhost:3000). doesitfit shows it on real screen sizes at once and tells you, bluntly, where it spills.
Free, no sign-up. Or ask Claude, ChatGPT or Codex to check it.
What to take from this
Narrowest: 360px
The Samsung Galaxy S26. If your layout survives this width with 16px of padding on each side (328px of content), it survives the rest.
Widest: 750px
The Samsung Galaxy Z Fold 7 — unfolded. Check that lines of text don’t get uncomfortably long and that your sm/md breakpoints kick in when you expect.
Questions people ask
What are the most common Samsung Galaxy viewport widths?
Samsung Galaxy viewports here range from 360px (Samsung Galaxy S26) to 750px (Samsung Galaxy Z Fold 7 — unfolded) wide. The most common width in this list is 384px (14 devices).
Which Samsung Galaxy sizes should I test?
Test the narrowest (360px), the most common (384px) and the widest (750px), plus landscape. If those three look right, the sizes in between almost always do too.
Is the viewport the same as the screen resolution?
No. The viewport is measured in CSS pixels, which is the screen resolution divided by the device pixel ratio (and by any display scaling). Media queries use the viewport.
Guides that help
- Responsive breakpoints in 2026 — the widths that matterWhere 123 real phones, tablets, laptops and monitors land in CSS pixels, which responsive breakpoints actually matter in 2026, and which screens to test.Guides · 8 min read
- What is a viewport? CSS pixels vs screen resolutionA viewport is the area your page is laid out in, measured in CSS pixels, not screen pixels. See real numbers from iPhones and MacBooks, then check yours.Guides · 8 min read
- How to fix horizontal scrolling on mobile (12 causes)Page wobbles sideways on phones? The 12 usual causes of horizontal scrolling on mobile, a fix for each, and a console snippet that finds the culprit fast.Fixes · 9 min read