The Most Advanced PDF Protection Tool
Our completely free online Protect PDF tool gives you unparalleled security over your sensitive documents. It operates with a strong focus on privacy, processing files completely offline in your browser.
Why our tool is better:
- Privacy First: Your documents never leave your device. The entire encryption process happens locally in your own web browser utilizing robust technology. No uploads to cloud servers.
- Bank-Grade AES-128 Security: We use industry-standard AES-128 bit encryption to apply passwords to your PDF documents.
- Professional Watermarking: Add an extra layer of security by inserting diagonal or horizontal custom text watermarks with adjustable opacity.
- Extremely Fast: Because processing happens locally on your machine, it's significantly faster than uploading large PDFs to the cloud.
- 100% Free: No limitations on the number of PDFs you can protect or their file size.
How to password protect a PDF file:
- Click Select Files or drag and drop your PDF documents into the upload area.
- In the Settings Panel under "Security Priority", enter a secure password. Warning: Keep this safe; without it, the file cannot be recovered.
- (Optional) Toggle "Add Watermark" to overlay a custom text mark on all pages.
- Click Protect PDFs.
- The securely encrypted PDF will instantly be saved directly to your hard drive.
Frequently Asked Questions
Is it safe to use this tool for confidential documents?
Yes. This tool is specifically designed for confidential documents. The encryption happens entirely within your web browser. We do not upload, store, or have access to your files or your password.
Can I remove the password later?
If you know the password, you can use PDF readers or our unlocking tools to remove the password. However, without the correct password, the encryption is robust and the file cannot be opened.