Protect PDF

Protect PDF adds a password to a PDF so it cannot be opened without entering that password first. This differs from editing permissions: once someone has the password, they can usually view, print, and edit the file depending on their PDF reader. People use it before emailing sensitive documents such as tax returns, payslips, medical records, or signed contracts, since email itself is not always secure and attachments can be forwarded on without your knowledge. HR departments protect employee files before sending them between offices, accountants protect client tax documents, and freelancers protect invoices that include banking details. The password acts as a simple lock: whoever needs the file also needs the password, usually shared through a separate channel such as a phone call or text message.

Accountants protect client tax returns before emailing them. HR teams protect offer letters and payslips that include salary and bank details. Freelancers protect invoices before sending them to clients, and families protect scanned passports or medical records before uploading them to a shared drive. Anyone sending a PDF with information they would not want a stranger to open right away can add a password first, especially when the file travels through email or a shared drive before reaching the right person.

The tool uses a lightweight browser-compatible PDF encryption library that applies 128-bit PDF password protection.

No. Password protection helps prevent casual opening, but you should still share sensitive files and passwords carefully, for example through separate channels.

No. We do not see or store the password. Keep a copy somewhere safe if the file matters.

No. This page only adds a password to your own PDF. It does not guess, crack, or remove passwords. Use Remove PDF Password if you already know a file's password and want to take it off.

No. The password is used only in your browser while the protected PDF is created. We do not transmit or store it.

One PDF up to 25 MB per job.