PDFProtect – Password Protect PDF files online for Free
Documents are mostly shared in PDF format and if the PDF file is private or confidential, then it’s better to secure it by adding a strong password to the desired PDF. PDFProtect is an online service which allows users to “Add password protection to PDF files online” – it’s easy and free to use. Maximum PDF file size supported is 10MB.
Link – www.pdfprotect.net