The popular streaming service has taken the decision in light of the coronavirus pandemic and in order to ease the strain on internet service providers.
The decision followed Thierry Breton - the European Commissioner for the Internal Market, -calling for people to switch to "standard definition when HD [high-definition] is not necessary".
Subsequently, Netflix explained: "Following the discussions between Commissioner Thierry Breton and [Netflix chief executive] Reed Hastings, and given the extraordinary challenges raised by the coronavirus, Netflix has decided to begin reducing bitrates across all our streams in Europe for 30 days.
Commissioner Breton has heaped praise on Netflix, hailing the streaming service for taking "very prompt action".
However, Netflix has yet to confirm whether similar measures will be applied elsewhere in the world, like North America.
The coronavirus - and the rise in the number of people working remotely - has led to a spike in internet usage around the world.
Indeed, Facebook has witnessed "big surges" as its users seek to stay connected with their friends amid the pandemic.