iPhone 17 Pro Max screen size

iPhone 17 Pro Max: 6.9″, 1320 × 2868, 460 PPI, 440 × 956 CSS viewport at DPR 3. Its tracked screen and layout references match the previous Pro Max generation, so the model update does not require a new responsive target by itself.

To proportion

6.9″

Compare this display →

Display size: 6.9″ (17.5 cm) diagonalofficial
Resolution: 1320 × 2868 pxofficial
Pixel density: 460 PPIofficial
Aspect ratio: 19.5:9calculated
Physical size (display): 2.88″ × 6.27″ (7.3 × 15.9 cm)calculated
CSS viewport: 440 × 956 pxreference
Device pixel ratio: 3reference
Release year: 2025

For developers

/* iPhone 17 Pro Max — portrait reference, not a breakpoint */
viewport: 440 × 956 CSS px
panel: 1320 × 2868 · DPR 3
/* Test immediately below and above your layout breakpoints. */

Tailwind breakpoint

base

0px-639px

Bootstrap breakpoint

0px-575px

Image slot example

1320 × 744

440px wide at DPR 3

Responsive testing plan

iPhone 17 Pro Max responsive workflow

Use the 440 × 956 CSS px at DPR 3 as a real QA target, then pair it with nearby widths for regression testing.

Open checklist Image assets for DPR Compare screen size

Model-specific checks

Use this model for large-iPhone screenshots, then repeat critical flows on a standard-width iPhone reference.
Check wide cards and media layouts without assuming the extra room is available across the whole iPhone range.

Values marked official come from manufacturer specifications; calculated values are derived from them; reference values are developer layout references and can vary with browser, zoom and operating-system settings.

Sources: Apple · Facts reviewed 2026-08-07

Content reviewed 2026-08-07

Model-specific guidance

What this means for layout and testing

A stable large-iPhone layout group

The current dataset keeps this model in the same large-screen layout group as its direct predecessor.

Hardware generation is not a breakpoint

A newer product name can matter to device coverage without changing the CSS width that drives the page layout.

Preserve smaller-width coverage

A layout that works on the largest tracked iPhone can still fail on standard and compact references, so this model should not be the only iPhone test.

Compare this device

The specifications below come from the device records; the notes explain why each comparison is useful.

Device configuration	Matched to	Screen	Panel	Viewport / workspace	PPI
iPhone 17 Pro Max Current page	iPhone 17 Pro Max	6.9″	1320 × 2868	440 × 956	460
iPhone 16 Pro Max The direct predecessor is the primary regression comparison because the tracked display and layout references are unchanged.	iPhone 17 Pro Max	6.9″	1320 × 2868	440 × 956	460
iPhone 17 The base model provides the more useful smaller-width companion target for responsive testing.	iPhone 17 Pro Max	6.3″	1206 × 2622	402 × 874	460