PDF Combine - Convert and Merge is a Firefox extension tailored for efficient document management. This tool allows users to convert various file types, including documents, HTML, and images, directly into PDF format. It excels in merging multiple files into a single PDF, catering especially to those who frequently manage diverse document types. Additional features include appending images to existing PDFs and rearranging the order of PDF pages, along with converting Word documents to PDF for enhanced accessibility.

The extension leverages APIs from online-convert.com, streamlining the process without the need for extra software installations. Users upload their files to the server for conversion and merging, ensuring high-quality output. Once the process concludes, downloading the finalized merged PDF is straightforward. For optimal performance and to bypass rate limits, users are advised to obtain an API key.