PDF Password Protector
A straightforward look at adding password protection to a PDF, and the honest current status of this feature.
About this pdf password protector
We would rather tell you plainly than fake a feature that would not actually hold up. Reliable, audited password encryption for PDFs is not yet available in a fully browser-only tool, so this feature is intentionally left unimplemented here rather than offering something that looks secure but is not.
How pdf password protector works
Real PDF encryption needs a cryptography implementation that has been properly reviewed for security. We have not shipped that yet in this browser-only tool, rather than offer a weak or fake version of password protection, this page says so directly.
Common uses
- Understanding why this specific feature isn't available yet
- Finding a reliable alternative for password-protecting a PDF today
How to use this tool
- Open your PDF in a reader that supports password protection (such as Adobe Acrobat Reader or a modern browser's print dialog).
- Use its built-in "Protect," "Encrypt," or "Print to PDF with password" feature.
- Save the newly protected file.
What to know before using it
This feature does not currently exist. In the meantime: most operating systems let you print to a password-capable PDF printer, and most PDF readers (including free ones) have a built-in "Protect" or "Encrypt" option built specifically for this job.
Privacy and browser-first processing
No file is processed by this page, since the feature is not yet available.
Frequently asked questions
Why doesn't this tool add a password to my PDF?
Trustworthy password encryption needs a properly reviewed cryptography implementation, which does not yet exist in a lightweight, fully browser-only form. We would rather be upfront about that than offer something unreliable.
What should I use instead right now?
Your PDF reader almost certainly has a built-in password protection feature (look for "Protect," "Encrypt," or similar in the menu), which is built specifically for this and is the more reliable option today.