The OSTtoPSTAPP PDF Split Tool is the best option to split a big PDF file, keeping its original formatting. This application guarantees that the layout and quality of your PDF stay exactly the same throughout the splitting process. Choosing particular pages or establishing a custom range will help you to separate effortlessly. It runs offline; hence, your data remains safe. Both personal and professional use of the program are appropriate, given its simplicity. Simply upload the file, specify your settings, and allow the application to manage the rest; no technical expertise is required. Furthermore, file size restrictions do not exist.