Screen sizesmonitor

3440 × 1440 viewport: which devices use it?

3440 × 1440CSS px · 16:6.7

3440 × 1440 is the CSS viewport of 1 device in our research, including the 34″ Ultrawide 3440×1440.

DeviceCSS viewportDPRPhysical pixelsYear
34″ Ultrawide 3440×14403440×144013440×1440–

Check your site at 3440 × 1440

Paste your address (or localhost:3000). doesitfit shows it on real screen sizes at once and tells you, bluntly, where it spills.

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

Designing for 3440px wide

Breakpoints

Tailwind: 2xl (sm: md: lg: xl: 2xl: styles apply). Bootstrap: xxl.

Room for content

3408px with 16px side padding, 3392px with 24px. Anything fixed wider than 3440px makes the page scroll sideways (how to fix it).

Questions people ask

Which monitor has a 3440 × 1440 viewport?

34″ Ultrawide 3440×1440.

Is 3440 × 1440 the screen resolution?

No, it’s the viewport in CSS pixels. The physical screen has more pixels: the 34″ Ultrawide 3440×1440 is 3440 × 1440 (DPR 1).

Which breakpoint does a 3440px wide screen use?

Tailwind CSS: 2xl (sm: md: lg: xl: 2xl: styles apply). Bootstrap: xxl.

Guides that help