Protect PDF — Password Protect PDF Online Free
Password protect and encrypt your PDF — free, no upload, no sign-up. Your file never leaves your browser.
Drop your PDF here or click to select
Your file stays on your device. Nothing is uploaded.
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How to password protect a PDF
Select your PDF file (it stays on your device). Type a strong password, and click the encrypt button. The tool immediately applies standard 128-bit RC4 PDF encryption (works in Adobe Reader), so the document can't be opened without the correct password.
Why encrypt your PDFs?
- Confidential data — protect financial records, medical information, or legal contracts before emailing them.
- Prevent unauthorized access — ensure only intended recipients can open the document.
- Comply with regulations — many industries require encryption for sharing sensitive documents.
Frequently asked questions
How strong is the encryption?
The tool uses standard 128-bit RC4 PDF encryption (works in Adobe Reader). It stops anyone without the password from casually opening the file, but it is an older standard and not strong protection for highly sensitive documents.
Can you recover my password if I forget it?
No. We process the file in your browser and never store your documents or passwords. If you lose the password, the PDF cannot be opened.
Is my PDF uploaded?
No. Everything happens entirely in your browser. Disconnect your internet after loading the page and it will still work!