PDF is the most widely used digital document format, and cuts down on the need to print out vast reams of paper, since a document looks the same on your screen as it does on the printed page. But what if you’ve already got a paper document and need to turn it into PDF? The solution is WinScan2PDF, a small tool that allows you to scan in paper documents and immediately convert them into PDF files. You can set the paper size for your document, and rotate pages that have scanned in upside down. The tool is also portable, meaning that it doesn’t need to be installed on Windows in order for you to use it, so you can copy it to a USB stick and run it on any PC you need to. The application requires very little in terms of system resources, so it should run on even old machines without problems.