Google Lenslens.google.com
Google's visual search. Matches objects, landmarks, text, products and visually similar images across Google's index; also does OCR and translation of text inside images.
imagedetails
tools / yandex-images
Yandex Images
Yandex reverse image search. Historically the strongest engine for matching faces, buildings and scenery, especially for content from Russia, Eastern Europe and Central Asia.
freeweb
field note
Always run an image through Yandex in addition to Google. It often finds near-duplicate and same-location photos that Google misses, particularly outdoor scenes and buildings.
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