A Screen Size.net report aggregates viewport data from 832 desktop and 130 mobile browser sessions between June and August 2026. The most common desktop viewport is 1920 × 920 CSS pixels, accounting for 11.7% of samples, while the top mobile width is 400px, representing 50.8%. Device pixel ratio (DPR) most often lands at 1.00×, covering 57.7% of 962 samples. Rankings exclude viewports wider than 6,000px or taller than 4,000px, and legacy tablets are omitted due to classification ambiguity. The data reflects only qualified sessions on Screen Size.net, not overall market share, and respects privacy controls. Tools like Viewport Size Checker and Device Pixel Ratio Checker are also highlighted for developers.

The report details monthly sample counts: 612 desktop and 20 mobile in June, 94 desktop and 72 mobile in July, and 677 desktop and 12 mobile in August. Quality rules, audit logs, and a list of common screen resolutions round out the analysis, offering developers real‑time insights into responsive breakpoints.

Key entities include Screen Size.net, Viewport Size Checker, Device Pixel Ratio Checker, and the identified top viewport dimensions for desktop and mobile.

Screen Size.net, 1920 × 920, 400px, 1.00×