If you don't have access to Adobe Acrobat or other PDF manipulation tools, MergePDF is a quick and hassle-free online tool for combining your documents. There are a small number of limitations on the tool, which shouldn't be deal breakers for most people in need of a quick PDF merge. You're limited to ten files that are 5MB or less for each merge you perform. Once you finish the merge and download the combined document, the original files are deleted. While the process wasn't as fast as combining them on a local computer with professional software in our tests, it was fine for deadlines that aren't in two minutes. The file merge pictured in the above screenshot took thirty seven seconds from the time the merge started until the file was downloaded to my computer. If you find yourself merging PDF files frequently, a free desktop solution might be in order. Previously reviewed PDFSam is a Java-based cross-platform tool that merges, and separates, PDF files in short order. MergePDF is a free to use, doesn't require registration.