Protect PDF
Add a secure password to your PDF files
Protect PDF Online
Protect your PDF files with a secure password using our simple and reliable Protect PDF tool. ConvertPDF.ai helps you add strong encryption to your documents so only authorized people can open them. Whether you want to secure business contracts, financial reports, study notes, or personal files, our online PDF converter makes protection fast and easy. Adding password protection keeps your sensitive information safe and prevents unauthorized access. You can control who views your document in just a few clicks.
How to Protect a PDF
Simple steps to get your converted file
Upload Your PDF
Select the PDF file you want to protect from your device.
Set a Password
Enter a strong password that will be required to open the PDF file.
Download Protected PDF
Download your secured PDF file instantly and share it safely.
Key Features of Our Protect PDF Tool
Add Strong Password Protection
Encrypt your PDF file with a secure password to prevent unauthorized access.
Quick & Easy Process
Protect your PDF in seconds with a simple and user-friendly interface.
Secure File Handling
Your files are processed securely and deleted automatically after completion.
Works on All Devices
Use the Protect PDF tool on desktop, tablet, or mobile browsers.
No Software Required
Protect PDF files fully online without installing any extra program.
Maintain File Quality
The original layout, text, and images remain unchanged after protection.
Ready to convert your files?
No installation required. No complicated settings. Just upload and convert.
Frequently Asked Questions
Everything you need to know about this tool
You can upload your file to our Protect PDF tool, set a password, and download the protected version. Free usage is available with basic limits.
Our tool applies secure encryption to ensure only users with the correct password can open the PDF.
Yes. You can use our Unlock PDF tool to remove password protection if you know the correct password.
No. Password protection does not change your document's content, formatting, or quality.
Yes. ConvertPDF.ai processes files securely and removes them automatically after processing.
Yes. Larger file protection is available depending on your usage plan.