How to SIGN A PDF
HelloSign
HelloSign. integrates directly with Gmail so you can sign documents right from your email. it also synchronizes with Google Drive, Dropbox, Box, SkyDrive, and Evernote.
HelloSign allows you to upload a signature file, draw it in with your mouse, or take a photo of your signature with a smartphone. Once it has your signature, it can sign and email documents quickly. Its integration with Gmail and ability to quickly sign and send documents may make it the ideal solution if you frequently need to sign and email documents without downloading them and using a desktop application.
HelloSign is free if you just need a single-user account, so you won’t have to shell out any money for the privilege of electronically signing documents. It has mobile apps for Android and iPhones.