What is Ad Refresh?
Ad Refresh, also referred to as auto-refresh ads, is a technique that allows publishers to increase the number of ad impressions served per pageview by reloading ads for active users on site. Refreshing ad inventory enables publishers to update ad content without having to refresh the entire webpage.
What are the benefits of Ad Refresh?
Refreshing ad units is a sure-fire way to increase the size of your ad inventory. More impressions usually mean more money; so setting a unit to refresh offers an enticing opportunity to do that without adding more units to a page. Therefore, the main benefit of Ad Refresh is the potential to increase ad revenue by increasing impressions without increasing traffic or load time.
Are there any drawbacks of Ad Refresh?
As with most things related to ad monetization, the reality of Ad Refresh is a little more complex than simply switching it on and earning more revenue. Refreshing ad units can increase revenue, but it can also have the opposite effect – or even get you banned if you do it wrong.
Policy varies between AdSense and AdX when it comes to ad refresh. The short version is that AdSense is mostly against it, whilst AdX allows it if you declare it. Let’s look at both cases in more detail:
This article was originally posted in June 2016 and has been regularly updated since. It was most recently updated in May 2020.
Refreshing AdSense ads
Generally, the rule here is don’t refresh. The exception is when the ad refresh is user-initiated. This means that you can load a new ad into a unit when the user interacts with the page, but can’t reload based just on elapsed time. An example of a valid refresh would be triggering a new ad request as the user clicked through a slideshow. If that slideshow was automatic (requiring no user interaction) then the refresh wouldn’t be allowed. This is one reason why publishers opt for Ad Exchange over AdSense – read on.
The wording of some articles on the Google Ad Manager help pages often confuse publishers on this issue, but AdSense policy is quite clear:
“Publishers are not permitted to refresh a page or an element of a page without the user requesting a refresh. “
Refreshing Google Ad Manager Ad Exchange ads
The Google Ad Manager Ad Exchange (AdX) provides more flexibility through the rules system. With AdX you can automatically reload or refresh ad units, as long as you declare that this is what you do. This declaration allows buyers to choose whether or not to have their ads appear in refreshing ad units. Failing to declare which portions of your inventory will auto-refresh is a violation of Google policy.
How to declare ad inventory that refreshes on Ad Exchange
The declaration can be made in by navigating to INVENTORY > AD EXCHANGE RULES > PUBLISHER DECLARATIONS then adding a “new display publisher declaration” to identify your refreshing inventory.
The declaration asks you to identify what triggers a refresh:
User behaviour: Ads only change based on a user-initiated navigation. There is no minimum refresh interval for ads triggered in this way. This method might apply to single-page-applications that allow the user to navigate without loading a new URL.
Event-driven content changes: Ads are refreshed based on custom events pre-defined by the publisher. Such triggers can only be used to refresh ads after a minimum of 30 seconds. For example, when a publisher refreshes a page with new content, this may trigger the ad to refresh.
Time intervals: The ad refreshes based solely on elapsed time. There must be a minimum of 30 seconds between refreshes. For example, ads might refresh after 120 seconds have passed.
Greater flexibility in ad implementation is just one of the advantages that Ad Exchange offers. Click here to learn more about Ad Exchange and how you could benefit from switching to AdX on your website.
Having your ad unit refresh is not guaranteed to increase revenue, even in the short term. Some factors worth considering include:
Some advertisers will not bid: Declaring refreshing units will stop some advertisers bidding on them. This could reduce impression CPM.
Overall viewability and CTR may be negatively affected: Particularly in cases of ad refreshing based on time intervals rather than user interaction. This is because viewability can be negatively impacted as refresh triggers do not always take into account whether the ad unit is inside the user’s viewport. If ads are outside the user’s viewport but are refreshed anyway, this worsens viewability and makes inventory less valuable.
Bids could be reduced: Impressions on refreshing units may be less effective for some advertisers and bids could be reduced as a result of performance even when auto-refreshing ads are acceptable to them, this can result in lower impression CPMs. However, the aim of Ad Refresh is to offset that dip by increasing volume. As such, when implementing Ad Refresh it is best to focus on the value of the page views and how much a user is worth, looking at both Page RPM and Session RPM, as opposed to Impression RPM.
CPC ads likely to perform worse: Each unit can only get clicked once, so publishers with a large proportion of CPC bidders may see little benefit from refreshing ads, or even a reduced yield if the highest-winner bidder’s ads go unseen.
How long are users spending on page: If few users are spending 30 seconds or more on page then the results from auto-refreshing will be minimal.
User experience considerations
Ad Refresh does not slow down the initial page load, though it does consume additional data when ads are refreshed. Refreshing ads means loading more creatives. However, this load does not stand between the user and the content.
Sites with significant mobile usage (particular users accessing outside of Wi-Fi), those that already have heavy pages and those whose users are likely to have slow connections will be most impacted by load time. The types of ads you accept should also be considered, as the load from a refreshing text unit vs a refreshing rich media unit can differ greatly.
How to refresh ad units
All of that considered, auto-refreshing units is a viable approach for many and something that we encourage publishers to test. The easiest way to implement it is to use the mechanism built into Google Ad Manager (click here for instructions).
It requires use of asynchronous GPT tags – this allows you to set a custom refresh period in milliseconds, so be sure to stick to the minimums outlined above.