Encrypt PDF Online Free
Password-protect your PDF files with AES encryption. Also decrypt password-protected PDFs.
Encrypt & Decrypt PDF
Add password protection to a PDF or remove it from an encrypted one.
Drop a PDF to encrypt
or click to browse • Max 10MB on free plan
How it works
Upload the PDF file you want to encrypt (or decrypt)
Set a password and choose permissions (print, copy, edit)
Download the encrypted PDF
Frequently asked questions
What encryption standard is used?
Can I decrypt a PDF?
Can I set print and copy restrictions?
Related tools
Watermark PDF
Add text or image watermarks to your PDF files. Protect your documents with customizable watermarks.
Compress PDF
Reduce PDF file size without losing quality. Perfect for email attachments and faster uploads.
Merge PDF
Combine multiple PDF files into one document. Drag and drop to reorder pages before merging.
Related guides
How to Collect Digital Signatures Online
Collect legally-binding digital signatures online. Learn how to add signature fields to forms, send signing requests, and verify signed documents.
How to Password-Protect a PDF
Password-protect and encrypt PDF files online for free. Set open and permission passwords with AES-256 encryption — no software needed.
How to Add a Watermark to a PDF
Add text watermarks to PDF files online for free. Customize text, position, opacity, and color — no software needed.
More from ZenBuild
Form Builder, Templates, E-Signatures, and more PDF tools — all in one platform.