The best alternatives to Search by Image are Bing, Pond5, and VisualData. If these 3 options don't work for you, we've listed a few more alternatives below.
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Bing is a web search engine owned and operated by Microsoft. The service has its origins in Microsoft's previous search engines: MSN Search, Windows Live Search and later Live Search. Bing provides a variety of search services, including web, video, image and map search products.