iPhoneiOS · phone · 2026

iPhone 18 Pro Max viewport size

440 × 956CSS px · 3× DPR · 1320×2868 physical

The iPhone 18 Pro Max gives web pages a 440 × 956 CSS pixel viewport in portrait. That’s the width your layout and media queries actually see, not the 1320 × 2868 physical pixels of the screen: with a device pixel ratio of 3, every CSS pixel is 3 × 3 real pixels.

CSS viewport (portrait)440 × 956what web pages get

Landscape956 × 440phones and tablets turned sideways

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

Physical resolution1320 × 28686.9″ screen

Visible in the browser440 × 800Safari (iOS 26), first load

Released2026iOS phone

See your site on an iPhone 18 Pro Max

Paste your address (or localhost:3000). doesitfit shows it at exactly 440 × 956, 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 440 × 956, but the browser’s own bars take some of it. In Safari (iOS 26) a page gets about 440 × 800 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)	440px	956px
Visible on first load (Safari (iOS 26))	440px	800px
Landscape (full)	956px	440px

What it means for your CSS

Breakpoints

At 440px: Tailwind uses base styles only (below sm, 640px); Bootstrap uses xs. In landscape (956px): 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 408px; with 24px it’s 392px. Text closer than 8px to the edge looks cramped (more).

Sharp images

A full-width image needs about 1320px of real pixels (440 × 3).

<img src="hero-1320.jpg"
  srcset="hero-800.jpg 800w, hero-1320.jpg 1320w"
  sizes="100vw" alt="…">

Styles for this width

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

@media (max-width: 440px) {
  /* screens 440px wide and narrower */
}

How common is 440 × 956?

440 × 956 isn’t in StatCounter’s top lists for Aug 2026 on its own, but other devices share it (below), and nearby sizes behave the same way. See the most common screen sizes.

Same viewport:

Close in size:

Compare:

iPhone 18 Pro vs iPhone 18 Pro Max

Everything about the 440 × 956 viewport · All devices 440px wide · All iPhone sizes

Questions people ask

What is the viewport size of the iPhone 18 Pro Max?

440 × 956 CSS pixels in portrait (956 × 440 in landscape), with a device pixel ratio of 3. The screen itself is 1320 × 2868 physical pixels.

How much of the iPhone 18 Pro Max screen does a web page get in Safari?

About 440 × 800 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 956px.

Which CSS breakpoint does the iPhone 18 Pro Max fall into?

At 440px wide, Tailwind CSS uses base styles only (below sm, 640px) and Bootstrap uses its xs tier. In landscape (956px) Tailwind uses md (sm: md: styles apply).

How wide should images be for the iPhone 18 Pro Max?

A full-width image needs about 1320px of real pixels (440 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 18 Pro Max without one?

Open doesitfit.lol, paste your address (localhost works too) and pick the iPhone 18 Pro Max. It shows your site at exactly 440 × 956 CSS pixels and flags anything that spills past the edge.

Guides that help

About these numbers

Confidence: Good: from official specs and reports.

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