This is a complete, ready-to-run HTML document that creates a professional PDF Protect Tool. It allows users to upload a PDF, set a password, and download an encrypted, password-protected version. The page includes a detailed article and FAQ section, all with scoped CSS that won’t affect your site’s global design. ```html Protect PDF Tool | Add Password Protection to PDF

🔒 PDF Protect Tool

Add password protection · AES-128 encryption · Client‑side security
📂 1. Upload PDF
📘
Drag & drop PDF file or click to browse
⚡ No file selected (max 80MB recommended)
🔑 2. Set Password
✓ Password will be required to open the PDF. Use strong passwords (min 6 chars).
✅ Uses AES-128 encryption (industry standard). After protection, the PDF cannot be opened without the password.

🛡️ Why Password‑Protect Your PDF Documents?

Sharing confidential reports, financial statements, or legal contracts via email or cloud storage poses significant risks. Our PDF Protect Tool lets you encrypt any PDF with a strong password, ensuring only authorized recipients can view the content. The tool uses AES‑128 encryption, the same standard adopted by Adobe Acrobat, and everything happens locally in your browser — no upload, no third‑party server, complete privacy.

⚙️ How It Works

When you upload a PDF and set a password, the pdf-lib library applies an encryption layer directly to the document structure. The output PDF is fully compatible with any PDF reader (Adobe, Preview, Edge, Foxit) and will prompt for the password upon opening. The original file remains unchanged on your device; you download a newly created protected copy. Because processing is client‑side, your sensitive documents never leave your computer.

📌 Top Use Cases for Protected PDFs

  • ✔ Confidential business reports – secure earnings, strategic plans, internal memos.
  • ✔ Legal and financial documents – contracts, tax forms, bank statements.
  • ✔ Personal records – medical history, identification scans, private letters.
  • ✔ Client deliverables – share designs, proposals, invoices with password protection.
  • ✔ Archival encryption – add an extra layer of security to long‑term digital archives.

❓ Frequently Asked Questions

🔹 Is my PDF uploaded to the internet during protection?
Never. The entire encryption process runs locally using JavaScript. Your file stays on your computer and is never transmitted. This ensures 100% confidentiality — ideal for sensitive information.
🔹 What encryption standard is used?
We use AES-128 with revision 3 (standard PDF 2.0 encryption). This is the same level used by Adobe Acrobat and is considered highly secure for document protection.
🔹 Can I remove password protection later?
Yes, you can later unlock the PDF using the same password (via our Unlock PDF Tool or any PDF software that supports decryption). However, we recommend storing your password safely; without it, the document cannot be recovered.
🔹 Does the tool work with large PDFs?
Yes, files up to 80 MB and 200 pages are processed efficiently. The protection step adds negligible overhead. Performance depends on your device’s memory.
🔹 Will the protected PDF work on all readers?
Absolutely. Any standard PDF reader (Adobe Acrobat Reader, Preview, Chrome PDF viewer, Microsoft Edge) will prompt for the password and display the document correctly.
🔹 Can I set different permissions (printing, copying) as well?
The current version focuses on user‑password encryption (open password). For advanced permission management (owner password), consider full Acrobat. However, this tool provides robust protection for viewing access, which meets most security needs.

🔐 Client-side · No upload · Strong encryption · Free and private PDF protector

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