Reverse image search is the process of searching for an image. If I say it in technical terms, it is a content-based image retrieval query technique used to search something by providing the image as input. It is used when you have an image and want to know more about that image. It can also be used to find manipulated versions of that image. Sometimes, it can also help in tracking down the image uploaded on The Internet.
Google image search supports reverse image search for a long time. You can either upload the image from the system and give an image URL. On the desktop, this feature is easily accessible. But on mobile devices, you can only search for an image in Google is you see an image on web page. You can long press on an image and then use option “Search Google for this image”. But no option to upload the image from your smartphone for reverse image search. It means, Google officially does not allow google reverse image search on mobile devices.
Also see: Make Google My Home Page
Google Reverse image search on mobile phone
If you badly want this feature to be easily accessible on your smartphone, there are few ways to perform reverse image search on mobile phone.
Use Desktop site of Google Images
Use third-party tools