Protect PDF with Password Online — Free PDF Encryption
Protecting sensitive personal, financial, legal, or health records is vital when sending documents online. SwiftPDFKit's Protect PDF tool adds standard password encryption to your PDF files. Our tool operates in volatile memory (RAM), ensuring your passwords and documents are never logged or stored on our servers.
How to Password Protect a PDF
Secure your files in seconds with these simple instructions:
- Upload the sensitive PDF document from your device.
- Enter a strong, secure password of your choice (minimum of 4 characters, preferably containing letters, numbers, and symbols).
- Click "Protect PDF" to apply 128-bit or 256-bit AES encryption layers.
- Download the protected PDF. Recipients must input the password to view it.
Security Features of our Protection Tool
We follow strict encryption standards to ensure your files remain secure:
- Strong AES Encryption: We encrypt document contents using industry-standard AES encryption algorithms.
- RAM-Only Security: Encryption happens in transitory server memory; passwords are never cached.
- No Watermarks: We do not add branding watermarks or alter your files.
- Completely Free: Protect unlimited files without needing a paid membership.
Best Practices for PDF Passwords
When protecting files, choose a password that is unique and difficult to guess. Avoid simple words or sequential numbers. Remember to communicate the password to the recipient using a separate, secure channel (such as a phone call or secure chat) to prevent unauthorized access.