Never again will you need to print documents for signature. Product. Nitro Sign We recommend you update your browser for the best experience: supported browsers How To Sign Documents with Nitro PDF ProOpen your document in Nitro PDF ProOn the main Home tab choose the QuickSign option and select Create New SignatureChoose from one of the four secure signing methods: Handwritten: type out your signature. We'll show you how easy it is to send and request secure, legally-binding electronic signature