iPhoneiOS · phone · 2025

iPhone Air viewport size

420 × 912CSS px · 3× DPR · 1260×2736 physical

The iPhone Air gives web pages a 420 × 912 CSS pixel viewport in portrait. That’s the width your layout and media queries actually see, not the 1260 × 2736 physical pixels of the screen: with a device pixel ratio of 3, every CSS pixel is 3 × 3 real pixels.

CSS viewport (portrait)420 × 912what web pages get

Landscape912 × 420phones and tablets turned sideways

Device pixel ratio3×1 CSS px = 3 × 3 screen pixels

Physical resolution1260 × 27366.5″ screen

Visible in the browser420 × 756Safari (iOS 26), first load

Released2025iOS phone

See your site on an iPhone Air

Paste your address (or localhost:3000). doesitfit shows it at exactly 420 × 912, with Safari (iOS 26)’s bars if you want them, and tells you if anything spills.

Free, no sign-up. Or ask Claude, ChatGPT or Codex to check it.

What a web page actually sees

The full viewport is 420 × 912, but the browser’s own bars take some of it. In Safari (iOS 26) a page gets about 420 × 756 on first load (62px status bar and Safari’s 94px bottom tab bar on first load; the bars shrink when you scroll). That’s your real “above the fold”. Use 100dvh instead of 100vh for full-height sections, or they’ll hide behind the toolbar (why).

Setting	Width	Height
Full viewport (portrait)	420px	912px
Visible on first load (Safari (iOS 26))	420px	756px
Landscape (full)	912px	420px

What it means for your CSS

Breakpoints

At 420px: Tailwind uses base styles only (below sm, 640px); Bootstrap uses xs. In landscape (912px): Tailwind uses md (sm: md: styles apply), Bootstrap md.

Tailwind breakpoints on real devices

Content width

With 16px of padding on each side your text column is 388px; with 24px it’s 372px. Text closer than 8px to the edge looks cramped (more).

Sharp images

A full-width image needs about 1260px of real pixels (420 × 3).

<img src="hero-1260.jpg"
  srcset="hero-800.jpg 800w, hero-1260.jpg 1260w"
  sizes="100vw" alt="…">

Styles for this width

Content-first breakpoints beat device lists, but if something breaks at this width:

@media (max-width: 420px) {
  /* screens 420px wide and narrower */
}

How common is 420 × 912?

420 × 912 isn’t in StatCounter’s top lists for Aug 2026 on its own, but nearby sizes behave the same way. See the most common screen sizes.

Close in size:

Compare:

Everything about the 420 × 912 viewport · All iPhone sizes

Questions people ask

What is the viewport size of the iPhone Air?

420 × 912 CSS pixels in portrait (912 × 420 in landscape), with a device pixel ratio of 3. The screen itself is 1260 × 2736 physical pixels.

How much of the iPhone Air screen does a web page get in Safari?

About 420 × 756 on first load: the 62px status bar and Safari’s 94px bottom tab bar on first load; the bars shrink when you scroll. Design your first screen for that height, not the full 912px.

Which CSS breakpoint does the iPhone Air fall into?

At 420px wide, Tailwind CSS uses base styles only (below sm, 640px) and Bootstrap uses its xs tier. In landscape (912px) Tailwind uses md (sm: md: styles apply).

How wide should images be for the iPhone Air?

A full-width image needs about 1260px of real pixels (420 CSS px × DPR 3) to look sharp. Use srcset so smaller screens don’t download it.

How can I test my website on an iPhone Air without one?

Open doesitfit.lol, paste your address (localhost works too) and pick the iPhone Air. It shows your site at exactly 420 × 912 CSS pixels and flags anything that spills past the edge.

Guides that help

About these numbers

Confidence: High: confirmed by more than one independent source.

Sources include DeviceAtlas, Chrome DevTools device list (EmulatedDevices.ts), iosref.com, ios-resolution.com. Researched September 2026.