Protect PDF
Add a password and encrypt your PDF file.
Frequently Asked Questions
What encryption standard does PDFtiny use to protect PDFs?
PDFtiny uses AES-256-bit encryption — the same standard used by banks and government agencies worldwide. You can also choose AES-128 for compatibility with older PDF viewers.
Can I restrict printing or copying even without a password?
Yes. Use the "Owner Password" permissions layer to restrict specific operations like printing, copying text, or editing — even if you do not require a user password to open the document.
Is my password ever sent to PDFtiny servers?
Never. The entire encryption process runs in your browser using the Web Crypto API. Your password and document are processed entirely locally and are never transmitted anywhere.
Will my password-protected PDF open on Android, iPhone, and desktop?
Yes. AES-256 password protection is part of the PDF 1.7 and PDF 2.0 standards. All major PDF viewers including Adobe Acrobat, Chrome, iOS Files, and Android apps correctly prompt for and accept the password.