Password Protect PDF Online – Encrypt PDF with AES-256
Secure your confidential PDF documents with strong AES encryption. Add opening passwords and restrict printing, copying, and editing permissions.
Drag & drop your file here
Accepts .pdf
Choose FileOptions
Required to open the file
Optional — controls printing/copying/editing
How to Use Protect PDF
- Upload PDF.
- Enter strong password and select permission restrictions.
- Download encrypted PDF.
Key Features & Security Standards
Client-Side & In-Memory Privacy
All computations, transformations, and string manipulations execute in your local browser memory or isolated ephemeral worker instances with zero permanent disk persistence.
Zero File or Data Retention
Your sensitive files, JWT keys, credentials, and code snippets are never shared, logged, or indexed. Data is automatically flushed as soon as your browser tab closes.
100% Free & Unlimited Usage
No credit cards, sign-ups, subscriptions, or watermarks. All Protect PDF features are accessible without rate limitations or intrusive paywalls.
Frequently Asked Questions
Is Protect PDF free to use?+
Yes, Protect PDF is 100% free with no registration, usage limits, or hidden fees.
Are my files or data private?+
Yes. All processing executes in-memory or directly client-side in your web browser with zero persistent file storage.