Secure PDF — Protect your PDF documents online — Soda PDF How to Protect a PDF File for FREE on eDocs.com — Protect PDF. Create your signature, sign your PDF and request people to sign · Unlock PDF. Remove password, encryption, and Password protect a PDF online for free | EDocs.com Password Protect PDF — Encrypt your PDF Online Safely How to Secure a PDF File Online on Amazon Cloud Drive/Drive 2. Use Safe Note, Dropbox, or OneDrive to secure and sync your PDF documents. Note: When using an offline document provider with Microsoft Word, PowerPoint, Excel, or OneNote — Make sure they are the official cloud service for that product before following the instructions listed here.