Protect PDF
Protect PDF files with strong AES-256 password encryption online for free. Keep sensitive documents secure.
or drop PDF files here
FAQ
Frequently Asked Questions
How to add password protection and AES-256 encryption to PDF files online free?
Upload your PDF file to PDF CHACHA's Protect PDF tool. Type your desired password, select encryption level (AES-128 or AES-256), and click "Protect PDF" to download a password-encrypted document.
Can I restrict PDF printing, text copying, and editing permissions?
Yes! You can set owner permissions to prevent unauthorized users from printing, copying text, extracting pages, or editing form fields without your master password.
Does encrypting a PDF document alter its visual layout or text formatting?
No. PDF protection adds cryptographic security headers around your document without altering page layout, text rendering, fonts, or image quality.
Are my master passwords and sensitive documents stored on external servers?
100% private. PDF encryption is handled locally inside your web browser via client-side WebAssembly, ensuring your passwords and documents are never transmitted or stored on cloud servers.