關於「Search by image」標籤，搜尋引擎有相關的訊息討論：

Search with an image on Google - Androidsupport.google.com › websearch › answerFind the URL of a page or image - Android - Google Search Helpsupport.google.com › websearch › answerReversee: Reverse Image Search on the App Store - Appleapps.apple.com › app › reversee-reverse-ima