What Does "Protect PDF" Do?
Protecting a PDF adds password-based encryption to the file itself, so it cannot be opened by anyone who doesn't know the password — not just a viewer-level restriction, but real AES-256 encryption applied to the document. It's the right tool when you're sending something sensitive, like a contract, financial statement, or personal record, and want an extra layer of security beyond just the email it's attached to.
How to Password-Protect a PDF — Step by Step
- Upload your PDF. Drag and drop the PDF you want to protect into the box above.
- Set a password. Enter and confirm the password required to open the file.
- Protect and download. Click "Protect PDF" and download the encrypted file.
Why Use Our PDF Protection Tool?
- Real AES-256 encryption, not a superficial viewer lock.
- You choose the password — nothing is generated or stored for you.
- Private — your file is automatically deleted within 2 hours.
- Free, fast, and works with no signup.
Frequently Asked Questions
What happens if I forget the password?▾
We do not store your password anywhere, so we cannot recover or reset it — keep it somewhere safe.
What encryption is used?▾
256-bit AES encryption, the current standard for PDF password protection.
Can I remove the password later?▾
Yes — use our Unlock PDF tool with the same password to remove protection.
Is my password sent anywhere else?▾
No — it is used only to encrypt your file during processing and is never stored.
Related Tools
- Compress PDF — Reduce PDF file size without losing quality.
- Merge PDF — Combine multiple PDFs into one file.
- Merge PDF and Image — Combine PDFs and images into a single PDF.
- Split PDF — Split a PDF into separate files by page range.
- Crop PDF Page — Crop margins or content area from PDF pages.
- Organize PDF — Reorder, delete or duplicate PDF pages.