Password Protect PDF Online Free

PDF password protection restricts access to your documents by requiring a password to open them. This is essential for sensitive files like financial records, legal contracts, medical documents, or any confidential information you share digitally.

Our tool applies genuine AES-256 encryption (the PDF 2.0 standard security handler, the same used by Adobe Acrobat) directly in your browser, so the resulting file requires your password to open in any compliant PDF reader.

All processing happens entirely in your browser. Your password and files are never sent to any server, making this one of the most private ways to prepare PDFs for protection online.

1. Upload your PDF — Select the document you want to protect.
2. Enter a password — Choose a strong password.
3. Confirm password — Re-enter the password to prevent typos.
4. Click "Protect PDF" — The tool creates a protected copy.
5. Download — Save the protected PDF and store your password safely.

• Password confirmation — Double-entry prevents accidental typos.
• Genuine AES-256 encryption — Real password protection, not just a copy.
• No server involvement — Your password never leaves your device.
• Instant processing — Protection is applied in seconds.
• 100% client-side — Complete privacy for your most sensitive documents.

• Financial documents — Protect bank statements, tax returns, and invoices before sharing.
• Legal contracts — Add a layer of security to contracts and agreements.
• Medical records — Secure health documents for HIPAA-conscious sharing.
• Business proposals — Protect proprietary information in business documents.
• Personal documents — Secure IDs, certificates, and personal records.