Online Trading System with Reverse Image Search is designed for people to post their items up for trade. Compared to the bartering and trading system in different social media platforms, this system assures traders that all registered individuals have a valid identity, which may avoid bogus transactions. A one-stop shop for people to post items of any kind; thanks to the categorization feature, unlike other platforms with many different groups for many different kinds of products, it is a hassle to find the product being searched. The researchers integrated an Image Tagging API into the system to handle the image search function, wherein traders use images to search for related products. The system sends that image to the Tagging API, then generates tags to be returned to the system to match other tags to have related items as a result.