Side Reader is a Chrome add-on designed to enhance the user experience while interacting with ChatGPT by allowing simultaneous PDF reading. This tool enables users to open a PDF reader alongside the ChatGPT interface, facilitating seamless access to information without interrupting the flow of conversation.

One of the key features of Side Reader is its capability to allow users to select words in the PDF, which triggers a pop-up button list. This list provides options to translate or explain the selected words, eliminating the need for repetitive copying and pasting. As a free tool, Side Reader serves as a practical alternative to other PDF tools like PDF.ai and ChatPDF, streamlining the process of document interaction while leveraging the power of ChatGPT.