SHANGHAI — A year and a half after Google pulled its popular search engine out of mainland China, partly over concerns about censorship, its rival Microsoft has struck a deal with the biggest Chinese search engine, Baidu.com, to offer Web search services in English.

Baidu, previously primarily a Chinese-language search engine, made the announcement Monday afternoon, saying Microsoft’s search engine, Bing, was expected to appear on Baidu’s Web pages by the end of this year.

Baidu, which dominates Chinese-language search services here with about 83 percent of the market, has been trying for years to improve its English-language search services because English searches on its site are as many as 10 million a day, the company said. Now it has a powerful partner.

“More and more people here are searching for English terms,” Kaiser Kuo, the company’s spokesman, said Monday. “But Baidu hasn’t done a good job. So here’s a way for us to do it.”