Secure your PDF with AES-256 encryption. Set a password to prevent unauthorized access to your document. Entire process runs in your browser.
How do I password protect a PDF online for free?
Upload your PDF to PDFBro's Protect PDF tool, enter your desired password, and click Protect. Your password-protected PDF downloads immediately.
What type of password protection does PDFBro use?
PDFBro applies AES-256 encryption to your PDF, which is the strongest PDF encryption standard available.
Can I protect a PDF without Adobe Acrobat?
Yes. PDFBro protects PDFs directly in your browser without any software installation.
Is my PDF safe when I protect it online?
Yes. The encryption process runs entirely in your browser. Your file and password are never sent to our servers.
100% Free — no hidden fees
No signup or account needed
Files processed locally in browser
No watermarks added
Drop a PDF here
A password will be required to open the protected PDF.
