Viewport Reality Report
An interactive benchmark of CSS viewport dimensions observed in ScreenSize.net browser sessions. Use it to test layout constraints, not to estimate global market share.
How many observed viewports fit your layout?
Test a content width or initial page height against anonymous ScreenSize.net observations. Results use rounded viewport buckets and are not global traffic estimates.
The curve uses the report's rounded buckets. Near a bucket boundary, the threshold result is an approximation rather than a pixel-perfect measurement.
What this sample shows
These observations describe qualified ScreenSize.net sessions during the reporting period. They are not global device or browser market-share estimates.
- /01
Common desktop pair
1920 × 920 CSS pixels is the most common desktop pair, representing 10% of qualified desktop observations.
- /02
The height checkpoint
The desktop median page viewport height is 920px in this observed sample. Use the calculator to test a hero or CTA against the full distribution.
- /03
Mobile width concentration
The mobile median viewport width is 400px. Narrower and wider buckets remain visible in the cumulative distribution.
Observed sessions by environment
Rankings are published independently and require the minimum sample before they are treated as a distribution.
| Environment | Qualified observations | Publication status |
|---|---|---|
| Desktop | 1,096 | Distribution available |
| Mobile | 196 | Distribution available |
| Tablet | 3 | Insufficient sample (min 50) |
Legacy tablet observations are excluded because the original classifier could mistake touch-enabled desktop computers for tablets.
Clear dimension anomalies are excluded from published rankings but remain in aggregate storage for auditing.
Observed viewport proportions
These are actual viewport pairs selected by viewport-area percentiles. Each frame is rendered at the same height (64px) so width and aspect ratio differences are immediately visible.
Viewport width × height density
Each point is a rounded aggregate bucket. Larger points represent more qualified observations within that environment.
Show more top viewports (5)
Show more top viewports (5)
Viewport reference points
Quantiles summarize the marginal width and height distributions; they are not guaranteed to form one observed width × height pair.
| Measure | p10 | p25 | p50 (Median) | p75 | p90 |
|---|---|---|---|---|---|
| Desktop width | 1160px | 1320px | 1520px | 1920px | 2000px |
| Desktop height | 700px | 780px | 920px | 1080px | 1280px |
| Mobile width | 380px | 400px | 400px | 420px | 440px |
| Mobile height | 600px | 660px | 700px | 780px | 840px |
Qualified observations by month
Counts show collection volume over time rather than normalized traffic share.
- Desktop:
- 61
- Mobile:
- 2
- Tablet:
- 0
- Desktop:
- 94
- Mobile:
- 7
- Tablet:
- 0
- Desktop:
- 677
- Mobile:
- 121
- Tablet:
- 0
- Desktop:
- 264
- Mobile:
- 66
- Tablet:
- 3
Device pixel ratio
CSS-to-device pixel density observed across sessions
Browser families
Distribution of browser families in qualified traffic
Unusual buckets kept in the observation set
These buckets are retained rather than silently removed. Their presence does not prove automation or represent a separate user population.
| Bucket | Desktop share | Observations | Interpretation |
|---|---|---|---|
| 800x600 | 3.4% | 37 | May include automation, remote desktop sessions, fixed-size windows and real users; retained for observational transparency. |
How to read this report
This report describes ScreenSize.net browser observations, not global device or browser market share.
Collection and privacy
A browser tab contributes at most one sample during its session. Measurements are rounded into monthly aggregate buckets. No IP addresses, user IDs, precise timestamps or full user-agent strings are stored. Global Privacy Control and Do Not Track signals are honored.
Quality and limitations
Viewports wider than 6,000 CSS pixels or taller than 4,000 are excluded from published distributions. Historical DPR values are normalized to 0.05 steps. Device class is inferred locally and remains an approximation. Width and height quantiles are marginal summaries and may not describe one paired viewport.
Data license
The published aggregate statistics on this page are available under CC BY 4.0. Please attribute ScreenSize.net and link to this report when reusing the data.
- Generated
- 2026-10-13
- Data through
- 2026-09-30
- Raw observations
- 1,448
- Qualified observations
- 1,295
Related tools
- Viewport Size CheckerSee your browser's CSS viewport size and window size live. Updates as you resize — with current responsive breakpoint for developers.
- Device Pixel Ratio CheckerCheck your device pixel ratio (DPR) instantly and understand the difference between CSS pixels and physical pixels, with visual examples.
- Common Screen ResolutionsReference list of common screen resolutions and viewport sizes across desktop, laptop, tablet and mobile, with aspect ratios and usage notes.
- Screen Resolution CheckerCheck the screen size reported by your browser in CSS pixels, see an estimated physical pixel grid, and learn how it differs from native resolution.