To see videos on YouTube, users must disable adblockers.

Ad blockers users, take note. YouTube has begun a new experiment that will prevent viewers from seeing YouTube video while ad blocking programs are enabled in a browser.

According to reports, the measure was a limited global test handed out by YouTube in order to ensure the highest income for advertisers' return on investment.

Before it became widely known, the news of YouTube's ad-blocking test was spread by many Redditors who claimed to have seen a pop-up warning saying "Ad blockers are not allowed on YouTube" when trying to watch video material on the platform.

While impacted users can avoid paying by disabling their Adblockers despite frequent encounters with advertising, they can also subscribe to YouTube's Premium membership for Php159 per month.

Aside from providing its customers with ad-free access to video content, Premium users also get unique access to YouTube Music, offline downloads, and the ability to run videos in the background on top of other programs.

Google has long been at conflict with ad blockers, banning purpose-built ad blocking applications from the Play Store in 2016 and adopting modifications in Chrome that might mean the end of ad blocking extensions in the near future.

However, ad filters have been mainly unsuccessful with YouTube's embedded advertising, so this test appears to be less about disabling ad blocks and more about selling YouTube Premium.

A YouTube official confirmed the appearance of the purported popup, telling Bleeping Computer that the incident was part of a "small experiment."