With all these features for more purposes at work, simple online PDF editing services from a web browser obviously won't meet the needs. You can enjoy more features like adding signatures, comments, merging or splitting pages and more. Actually, PDF editing software programs can do more than just format conversion. With PDFs' proven efficiency and convenience, people sometimes would look for a tool to convert non-PDF files into PDF, or for some special scenarios, they might need to turn PDF files into files of other formats. Ever since the inception of PDF files, they have been instrumental to the optimized communication and management for office work and various production processes.