iPhone

iPhone 17 vs iPhone Air: screen size for websites

The iPhone Air is 18px wider and 38px taller in CSS pixels. Small enough that most layouts behave the same, but fixed widths between 402 and 420px will spill on the narrower one.

iPhone 17iPhone Air
CSS viewport402 × 874420 × 912
Visible on first load402 × 718 (Safari (iOS 26))420 × 756 (Safari (iOS 26))
Device pixel ratio33
Physical resolution1206 × 26221260 × 2736
Screen size6.3″6.5″
Aspect ratio19.6:919.5:9
Tailwind breakpointbase styles onlybase styles only
Bootstrap tierxsxs
Full-width image needs1206px1260px
Released20252025

See your site on both, side by side

Paste your address (or localhost:3000). doesitfit shows it on the iPhone 17 and iPhone Air at their exact sizes, next to each other.

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

What the difference means for your site

Width: 402px vs 420px

Headings and buttons wrap differently: a line that fits in 420px can break onto two lines in 402px. Anything with a fixed width between the two makes the narrower screen scroll sideways (fix it).

Height: 874px vs 912px

On first load a page shows 718px on the iPhone 17 and 756px on the iPhone Air, so “above the fold” differs by 38px.

Questions people ask

Is the iPhone 17 screen bigger than the iPhone Air for websites?

The iPhone Air is 18px wider and 38px taller in CSS pixels. Small enough that most layouts behave the same, but fixed widths between 402 and 420px will spill on the narrower one.

What are the viewport sizes of the iPhone 17 and iPhone Air?

iPhone 17: 402 × 874 CSS px (DPR 3). iPhone Air: 420 × 912 CSS px (DPR 3).

Do I need to test my site on both?

Yes if your layout has anything close to 420px wide. Test the narrower one first: it’s where things spill.

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