Protect PDF
Add a password to a PDF. (Note: true encryption is limited in pure browser JS.)
Your files are processed locally in your browser (no uploads).
About this tool
Password-protecting PDFs is useful for sensitive documents, but strong encryption can be challenging client-side.
This page is ready for an upgrade to full AES encryption if you choose a compatible approach.
FAQ
Is the PDF truly encrypted?
Pure browser encryption is limited with pdf-lib; this page shows a clear notice.
Are my files uploaded?
No—processing happens locally in your browser.
Can you add real encryption?
Yes—either via a stronger JS library or a server-side endpoint.