Summarize This is a versatile AI tool that can summarize various types of content, including text, YouTube videos, Twitter threads, and PDFs. Users can input any size of text they want to summarize and get a concise summary. The tool also allows users to paste the URL of a YouTube video or Twitter thread to generate a summary based on the captions or content. Additionally, users can upload PDF files for summarization, although some files may not be compatible if they are corrupted. While the tool was initially free, the integration of the Open AI API has made it necessary to use the user"s own API key. Overall, Summarize This provides a convenient and free solution for summarizing different types of content with the help of AI technology.