Free Protect PDF Online
Protect PDF files with password encryption. Restrict printing, copying, and editing. Secure your sensitive documents.
Protect PDF — launching Summer 2026
The in-browser protect pdf tool is in private beta. Join the waitlist to be notified when it goes live and to get early access.
Join the WaitlistKey Protect PDF Features
How to Protect PDF Online
Follow these simple steps to protect pdf your files in seconds.
Upload your PDF
Select the PDF document you want to protect with a password.
Set your password and permissions
Choose a strong password and select which actions to restrict (printing, copying, editing).
Protect and download
Click 'Protect PDF' and download your encrypted, password-protected document.
About the Protect PDF Tool
Keep your sensitive PDF documents secure with SublimePDF's Protect PDF tool. Add strong AES-256 encryption with password protection to prevent unauthorized access. Set separate passwords for opening and permissions, and granularly control whether users can print, copy text, or edit the document. Perfect for confidential contracts, financial statements, personal records, and any document that requires restricted access.
Why Use Protect PDF Online?
Apply AES-256 encryption — the same standard used by governments and financial institutions — directly in your browser. Set separate owner and user passwords, and granularly control permissions for printing, copying text, editing, and form filling.
- Completely free — no registration, no watermarks, no hidden fees.
- Private by design — files stay on your device; nothing is uploaded.
- Instant results — browser-based processing means no waiting for server queues.
- Works everywhere — Chrome, Firefox, Safari, and Edge on desktop, tablet, or mobile.
Privacy & Security
Your privacy matters. When you use SublimePDF's Protect PDF tool, all processing happens directly in your web browser using WebAssembly technology. Your files are never uploaded to our servers, never stored, and never seen by anyone but you.
About the PDF Format
PDF (Portable Document Format) was developed by Adobe and standardized as ISO 32000. It preserves document formatting across all devices and platforms, making it the universal standard for sharing and archiving documents.