Password Protect PDF
Secure your confidential documents by adding an encrypted password layer instantly.
Choose PDF or drag & drop
Applying encryption headers...
Professional PDF Security
When sharing sensitive financial reports, legal contracts, or medical records, an open PDF is a liability. Our **Protect PDF** tool allows you to wrap your document in a cryptographic shield. By setting an 'Owner Password,' you ensure that only authorized recipients can open and view your content.
Security First: Local Encryption
At **PDF MASTER TOOLS**, we respect your data. Our protection engine runs **entirely in your browser**. We never see your documents or your passwords, and they are never stored on any server.
Frequently Asked Questions
What type of encryption is used?
We use industry-standard PDF encryption (AES) to wrap your document security objects.
If I forget the password, can you recover it?
No. For security and privacy, we never see your password. Keep it safe.
Is the service actually free?
Yes. PDF MASTER TOOLS is 100% free with no hidden tiers.
Does this tool work on mobile devices?
Absolutely. You can secure documents from your phone's browser.