iPhone Air vs Galaxy S25: screen size and viewport
The iPhone Air lays web pages out at 420 × 912 CSS px with a pixel ratio of 3; the Galaxy S25 at 360 × 780 with 3. The iPhone Air is 60 px wider and 132 px taller.
The two screens side by side
Specs compared
| Spec | iPhone Air | Galaxy S25 | Difference |
|---|---|---|---|
| Viewport, portrait (CSS px) | 420 × 912 | 360 × 780 | +60 px wide, +132 px tall |
| Device pixel ratio | 3 | 3 | same |
| Physical resolution | 1260 × 2736 | 1080 × 2340 | iPhone Air: 36% more pixels |
| Aspect ratio | 19.5:9 | 19.5:9 | about the same |
| Visible height, portrait, with browser bars | ~722 px | ~684 px | +38 px for the iPhone Air |
| Landscape width (CSS px) | 912 px | 780 px | +132 px for the iPhone Air |
| Visible height, landscape | ~370 px | ~280 px | +90 px for the iPhone Air |
| First released | 2025 | 2022 | 3 years apart |
| Engine in MobileCheck | WebKit (Safari) | Chromium (Chrome) | different engines |
CSS px are the units media queries see. Visible heights subtract the status bar and the Safari on iOS and Chrome on Android bars as set in our device profiles; real bar heights vary with settings and scrolling. The release year is that of the first model with each screen.
What this means for your layout
How the width difference affects your layout
The iPhone Air is 60 CSS px wider (420 vs 360, 17% more). 3 common breakpoints fall between them: (min-width: 375px) (a common small-phone test width), (min-width: 390px) (a common phone test width), (min-width: 414px) (a common large-phone test width) match the iPhone Air but not the Galaxy S25, so a rule written for that width applies on only one of the two.
In a 2-column card grid with 16 px page padding and 16 px gaps, each card is 186 px wide on the iPhone Air and 156 px on the Galaxy S25. Check that buttons, prices and long words still fit in the narrower one.
Pixel density and image sizes
Both draw each CSS pixel with 3 × 3 device pixels, so text and icons are equally sharp. A full-width image (sizes="100vw") needs about 1260 px on the iPhone Air and 1080 px on the Galaxy S25 to look sharp.
With a srcset such as 640w, 828w, 1080w, 1290w, 1440w, 1640w, 2048w, the browser would normally pick the 1290w file on the iPhone Air and the 1080w file on the Galaxy S25. Leave out the 1290w candidate and the iPhone Air upscales a smaller file.
Above 2× most people can't see much difference in photos, so capping photo candidates around twice the CSS width saves bytes on both. Keep SVG for icons and logos: they stay sharp at any ratio.
How much fits above the fold
On first load about 722 px of the page is visible on the iPhone Air and 684 px on the Galaxy S25: 38 px less (6%) on the Galaxy S25, roughly 1 line of 16 px body text at a 1.5 line height.
If your main button sits just above the fold on the iPhone Air, it can end up below it on the Galaxy S25. Keep the headline and the main action within the first 684 px, and size full-screen sections with 100svh rather than 100vh — see the 100vh problem on mobile.
In landscape
Turned sideways, the iPhone Air is 912 px wide and the Galaxy S25 780 px; (min-width: 840px) matches only the iPhone Air in landscape. The visible height drops to about 370 and 280 px, so a 64 px sticky header covers 17% and 23% of the screen — under the 25% at which MobileCheck flags fixed bars covering the page.
Different browser engines
The iPhone Air renders with WebKit (Safari's engine) and the Galaxy S25 with Chromium (Chrome's), so fonts, form controls and some CSS can differ on top of the size difference. Chrome DevTools draws every emulated device with Chromium, which hides WebKit-only problems — see how to test on an iPhone and on Android.
More about these devices
- iPhone Air viewport size
- Galaxy S25 viewport size — one screen for the Samsung Galaxy S22 / S23 / S24 / S25
Or open the free check with the iPhone Air and the Galaxy S25 preselected: full-page screenshots in WebKit and Chromium, with problems such as small text and crowded buttons highlighted.
Related comparisons
- iPhone 17 vs Galaxy S25 — 402 vs 360 px wide, 3× vs 3×
- iPhone 15 vs Galaxy S24 — 393 vs 360 px wide, 3× vs 3×
- iPhone Air vs Pixel 9 — 420 vs 412 px wide, 3× vs 2.625×
- iPhone Air vs iPhone 17 — 420 vs 402 px wide, 3× vs 3×
- iPhone Air vs iPhone 17 Pro Max — 420 vs 440 px wide, 3× vs 3×
- Galaxy S24 vs Galaxy S24 Ultra — 360 vs 384 px wide, 3× vs 2.813×
Compare other devices → · All mobile viewport sizes →
Frequently asked questions
Is the iPhone Air screen bigger than the Galaxy S25?
In CSS pixels, which decide how much of a page fits, the iPhone Air is larger: 420 × 912 against 360 × 780. The iPhone Air has more physical pixels (1260 × 2736), which makes it sharper rather than roomier.
Do I need different CSS for the iPhone Air and the Galaxy S25?
Only if your breakpoints fall between 360 and 420 px: a min-width query at 375px or 390px or 414px applies to one and not the other. A fluid layout handles both without device-specific rules.
How much of a web page is visible on the iPhone Air vs the Galaxy S25?
About 420 × 722 CSS px on the iPhone Air and 360 × 684 on the Galaxy S25 when a page first opens in portrait, after the status bar and the browser's bars. Bar heights are our device profiles' estimates.