Google announced on Wednesday that it would ban all advertisements for payday loans and related products on its website because they often lead to unaffordable repayment terms and financial harm to consumers.

David Graff, the director of global product policy at Google, announced in a blog post that the global ban would take effect July 13 and would apply to loans for which repayment was due in 60 days and for loans that carry an annual percentage rate of 36 percent or higher.

“This change is designed to protect our users from deceptive or harmful financial products,” Mr. Graff wrote. “Ads for financial services are a particular area of vigilance given how core they are to people’s livelihood and well-being.”

It is the first time that the company has banned such a broad range of financial advertisements on its site, but the move was welcome by advocates seeking stricter controls on an industry long accused of targeting low-income and minority communities with loans that carry egregiously high interest rates.