Protect PDF is a browser-based tool on PDFBro. Secure your PDF with AES-256 encryption. Set a password to prevent unauthorized access to your document. Entire process runs in your browser. No signup required, no watermarks added. Maximum file size: 100 MB.
FAQ
- 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.