I highly recommend SumatraPDF or MuPDF if you're after something a bit more. You may or may not need an add-on or extension to do it, but it's pretty handy to have one open automatically when you click a PDF link online. Most web browsers, like both Chrome and Firefox, can open PDFs themselves. Ø Repeat as necessary to add all files desired. It's completely fine to use, but I find it to be a somewhat bloated program with lots of features that you may never need or want to use. Ø Use Ctrl-click to add multiple files from the same directory. Click on 'Split All' to save all PDF pages individually (optional). Click on the scissor icon on the page after which you want to split the document. Adobe created the PDF standard and its program is certainly the most popular free PDF reader out there. How to split a PDF online Upload the PDF file you want to split. Most people head right to Adobe Acrobat Reader when they need to open a PDF. Combine multiple PDF documents into one, or Append a PDF file to your existing PDF document. PDF files always look identical on any device or operating system. The reason PDF is so widely popular is that it can preserve original document formatting. The Portable Document Format (PDF) is a universal file format that comprises characteristics of both text documents and graphic images which makes it one of the most commonly used file types today.