The online marketing service was purchased for $250 million (£161 million) and was founded just four years ago.
In a blog post announcing the acquisition last week, Google's product management director Jason Miller explained: "People today can make their voices heard in ways that were previously impossible and Wildfire helps businesses uphold their end of the conversation."
He said he wants to create more meaningful interactions and help to build fresher content across the web.
Wildfire co-founders Victoria Ransom and Alain Chuard said there will be no change to the operation of the company's services or support while the transition continues.
They added that they believe the merger will create a better platform for managing digital media marketing strategies.