Protect PDF
Upload a PDF and set a password that will be required to open it. The tool uses pdf-lib's built-in encryption to apply both a user password (required to open the document) and matching owner password, with restricted permissions — printing is limited to low resolution, and copying, modifying, and annotating are disabled.
This is standard PDF password protection as defined in the PDF specification — the same kind of encryption Adobe Acrobat and other PDF tools apply. Any compliant PDF reader will enforce the password prompt on open.
Keep your password in a safe place. If you lose it, there is no way to recover access to the protected file — you would need the original unprotected version.
By The Paper Room Editorial Team — PDF Tools
Frequently asked questions
How strong is the encryption?▼
pdf-lib applies standard PDF encryption as defined in the PDF specification. The actual security depends heavily on your password strength — a short or common password can be brute-forced. Use a long, unique password for sensitive documents.
Can I remove the password later?▼
Yes, if you know the password. Open the protected PDF in any PDF reader, enter the password, and re-save or re-export it without protection. You can also use the Unlock PDF tool on this site if the PDF has only owner-level restrictions.
Does this upload my PDF to a server?▼
No. The encryption happens entirely in your browser. Your file and password never leave your device.
What permissions are restricted?▼
Printing is limited to low resolution, and copying text, modifying the document, annotating, filling forms, and document assembly are all disabled. Content accessibility is left enabled for screen readers.