What Is Ad Viewability?
Ad viewability measures whether an ad had the opportunity to be seen on a user’s screen. Under standards set by the Media Rating Council and Interactive Advertising Bureau, display ads are considered viewable when at least 50% of the ad’s pixels remain visible for one continuous second. Video ads require two continuous seconds.
Large display formats follow a lower threshold, requiring at least 30% of their pixels to remain visible for one second. Google Active View uses these standards when measuring viewable impressions across digital advertising campaigns.
Viewability does not prove that a user noticed, remembered, or interacted with an ad. It simply confirms that the ad placement gave the ad a reasonable opportunity to be seen. This makes it an important metric for publishers and advertisers evaluating ad delivery, campaign quality, and overall digital advertising performance.
How Ad Viewability Is Measured
Ad viewability is calculated by dividing viewable impressions by the total number of measurable impressions and multiplying it by 100.
Viewability = Viewable Impressions ÷ Measurable Impressions × 100
This gives publishers a viewability rate showing how often ads served had a genuine opportunity to be seen.
Key measurement methods include:
- Viewable impressions: Ads that meet the required pixel and time thresholds. Non-viewable impressions are measurable ads that fail to meet these standards.
- Measurable impressions: Ads that measurement technology can assess. Non-measurable impressions are excluded when publishers calculate viewability.
- vCPM: Viewable cost per thousand impressions allows advertisers to buy ads and publishers to report or bill based on impressions that were considered viewable.
- Google Active View: Google Ad Manager’s built-in viewability measurement solution tracks measurable and viewable ad impressions using MRC standards.
- Third-party verification: Providers such as IAS and DoubleVerify independently measure viewability, media quality, and campaign delivery across devices and ad formats.
These metrics give publishers deeper insights into ad placement, user behaviour, and overall ad performance.
Why Ad Viewability Is Important for Revenue
Higher ad viewability makes inventory more valuable because advertisers want their ad spend directed towards impressions that users can actually see. When more ads meet recognised viewability standards, publishers can attract greater demand from brand advertisers and campaigns that buy on a viewable cost per thousand impressions (vCPM) basis, which can support higher CPMs and improve page revenue per thousand impressions (RPM).
This demand can support higher CPMs for well-positioned display ads and video ads. It can also improve page revenue per thousand impressions (RPM), since a greater share of the publisher’s inventory qualifies for higher-value digital ad campaigns rather than lower-paying demand.
Google Ad Manager explains that advertisers increasingly buy viewable impressions, placing publishers with more viewable inventory in a stronger position to attract demand. Google also advises publishers to improve viewability to benefit from higher CPMs. This relationship is reflected in Trader Interactive’s results with Publift, where a 62% increase in average viewability was accompanied by an 88% rise in programmatic page RPM and 66% higher average daily revenue year over year.
However, higher viewability does not guarantee higher revenue on its own. Ad placement, audience quality, fill rate, format, geography, and overall media quality also affect CPM and RPM performance.
What Is a Good Viewability Rate?
An ideal ad viewability rate for display inventory is generally 70% or higher. In its July 2026 Media Quality Report, Integral Ad Science reported global viewability rates of 67.9% for display and 79.7% for video, making 70% a practical publisher target rather than a universal industry average.
Benchmarks still vary by ad format, device, region, measurement provider, and user behaviour. DoubleVerify currently lists average viewability rates of 66% for display ads and 70% for video ads across channels.
Video ads often achieve higher viewability because they appear in more prominent placements. Publishers should compare viewability data by device, format, page type, and ad placement to identify where performance falls below the most relevant benchmark.
What Hurts Ad Viewability
Several factors can prevent ads served on a web page from becoming viewable impressions. Poor placement, delayed ad delivery, and user behaviour can all reduce viewability rates, even when the ad itself loads correctly.
Below-the-Fold Placements
Below-the-fold ad placements often have lower viewability rates because many users leave before reaching them or scroll past too quickly. Units at the very top can also underperform when users begin scrolling immediately, leaving publishers with high impression volumes but fewer impressions that meet viewability standards.
Slow Page Load and Lazy-Load Timing
Poor page load speed can cause ads to appear after users move beyond the slot. Lazy-loaded ads face the same problem when loading begins too late, widening the gap between total measured ad impressions and viewable impressions while lowering inventory value.
Fast Scrolling and Ad Refresh Timing
Fast scrolling can stop ads from remaining on the user’s screen long enough to qualify as viewable. Poorly timed refreshes can also create measurable impressions while the slot is outside the viewport, inflating total impressions without increasing total viewable ad impressions. This weakens viewability data and can limit CPM and RPM performance.
How to Improve Ad Viewability Without Hurting UX
Publishers can improve ad viewability without adding more units or disrupting the reading experience. The goal is to make existing inventory easier to see while keeping pages fast, stable, and comfortable to use.
Optimise Ad Placement and Layout
Place ads within content-rich areas where users naturally pause, such as between article sections or near high-engagement content. Test placements just above the fold rather than assuming the top of the page will perform best. Use scroll-depth, device, and screen-resolution data to optimise ad placement for different page templates. A clear visual hierarchy gives ads better visibility without competing with the main content. Publishers can also review Publift’s ad layout examples to compare how different formats work across devices and page designs.
Lazy-Load and Use Viewability-Triggered Refresh
Load above-the-fold units early and apply lazy loading to below-the-fold ads based on their distance from the viewport. The timing should account for page speed, device type, and typical scrolling behaviour. Where refresh is appropriate, use declared inventory and trigger it only while the unit remains in view. Longer, transparent refresh intervals can also make the inventory more attractive to buyers.
Use Sticky or Anchored Units Responsibly
Sticky ads and anchored units can maintain visibility as users move through a page. Keep them compact, stable, and easy to dismiss where required. They should never cover key content, dominate smaller screens, or interfere with navigation.
Improve Core Web Vitals and Page Speed
Reduce ad latency, heavy scripts, and unnecessary passbacks to support Largest Contentful Paint (LCP) and Interaction to Next Paint (INP). Reserve space for every ad container to protect Cumulative Layout Shift (CLS) and maintain a stable page layout.
Use a Managed Ad Partner
Publift’s Fuse platform combines placement testing, lazy-load configuration, refresh strategy, and performance reporting within a managed service. Our yield and technical teams can analyse viewability data by device, geography, page type, and format while protecting Core Web Vitals and the wider user experience. Publishers can explore further ways to increase ad revenue without hurting UX by balancing placement, page speed, ad formats, and demand.
Ad Viewability and Core Web Vitals
Ad viewability and Core Web Vitals measure different parts of the same page experience. Viewability tracks whether an ad had the opportunity to be seen, while Core Web Vitals assess how quickly, smoothly, and responsively the page works for users.
Largest Contentful Paint (LCP) affects whether ads and surrounding content appear before users scroll away. Cumulative Layout Shift (CLS) matters because unstable ad slots can move an ad out of view or disrupt the reading experience.
Interaction to Next Paint (INP) measures page responsiveness during user interactions. It replaced First Input Delay (FID) as a Core Web Vital on March 12, 2024.
Strong performance across LCP, CLS, and INP gives ads a better chance to load in time, remain in a stable position, and stay visible long enough to meet recognised viewability standards.
Ad Viewability Results From Publift Publishers
Publift has helped publishers improve ad viewability, page speed, and overall ad performance through better placement, lazy loading, layout testing, and technical optimisation. These changes have contributed to stronger viewability rates, higher page RPM, and improved revenue across different publisher environments.
| Publisher |
Measurement Period |
Viewability Result |
Revenue Result |
| Trader Interactive |
June 2023 to Q3 2024 |
62% initial increase, later reaching 70% |
88% higher page RPM and 66% higher average daily revenue YoY |
| Thingiverse |
August to October 2024 |
Viewability increased steadily |
41% higher ad revenue YoY |
| ShopGoodwill |
September to December 2024 |
Viewability increased steadily |
23% Q4 ad revenue uplift |
The results also show the value of analysing performance at the ad-unit level. Comparing viewability data across devices, page templates, formats, scroll depth, and refresh settings helps publishers identify where inventory is underperforming and where changes can have the greatest impact on CPM and RPM.
Frequently Asked Questions
What is a good ad viewability rate?
A good ad viewability rate is 70% or higher, although verified 2026 benchmarks vary by source and format. IAS reported 67.9% global display viewability and 79.7% global video viewability in July 2026. DoubleVerify’s public figures are 66% for display and 70% for video across channels.
How is viewability measured?
Viewability is measured by checking how much of an ad’s pixels remained visible and for how long. Google Active View applies the IAB and MRC thresholds: 50% of pixels for one continuous second for display, 50% for two continuous seconds for video ads, and 30% for large-format display units.
Does higher viewability increase revenue?
It can. Advertisers increasingly buy based on viewable impressions, placing publishers with strong viewability in a better position to capture that demand. For video, Google has cited internal data linking an increase from 50% to 90% viewability with a revenue uplift of more than 80%. This figure applies to video and Google’s own dataset, not display inventory generally.
Can publishers improve viewability without adding more ads?
Yes. Google's own recommendations centre on better placement, faster load speed, correct lazy loading for below-the-fold slots, responsive design and fewer passbacks, all of which raise the share of ads that are actually seen without increasing ad density on the page.
Key Takeaways:
- Ad viewability measures whether an ad had a genuine opportunity to be seen.
- Higher viewability can attract more advertisers, stronger demand, and higher CPM and RPM potential.
- Better placement, faster loading, and correct lazy loading reduce non-viewable impressions.
- Core Web Vitals and viewability should be optimised together instead of treating them as separate goals.
- Publift Fuse provides managed testing, reporting, and optimisation across placements, formats, devices, and page performance.
If you are making more than $2,000 in monthly ad revenue, contact us today to learn more about how Publift can help increase your ad revenue and best optimise the ad space available on your website or app.