Protect PDF Free Online - Add Password Protection to PDF Files
Add password protection to your PDF files effortlessly and at no cost. Protect PDF documents instantly with our free online tool.
Join millions of users who trust PurePDF for secure, browser-based PDF protection
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Add password protection to your PDF files effortlessly and at no cost
Fast & Easy PDF Protection
Add password protection to your PDF files effortlessly with our free online tool. Protect PDF documents with strong AES-128 encryption. Our free PDF protector works entirely in your browser, ensuring your files never leave your device. Protect PDF files online without losing quality.
Strong Encryption
Protect PDF files with AES-128 encryption. Your documents are secured with industry-standard password protection.
100% Secure & Private
All protection happens in your browser. Your PDF files never upload to any server, ensuring complete privacy.
File Protection Guaranteed
We're serious about file security. Since all processing happens entirely in your browser, your PDFs are never transmitted to any server. This means your files remain completely private and secure throughout the protection process. No data is stored, logged, or shared with third parties. Protect PDF files online with complete confidence.
How To Protect PDF Files Online for Free
Upload or drag and drop your PDF file
Click the upload area or drag and drop your PDF file into the protector. Our free online PDF protector accepts files of any size.
Enter and confirm your password
Enter a strong password to protect your PDF file. Confirm the password to ensure it's correct. This password will be required to open the PDF.
Click 'Protect PDF' and wait a second
The protection process is automatic. Your password-protected PDF will be ready in seconds, secured with AES-128 encryption.
Download your protected PDF
Your password-protected PDF file will automatically download. No watermarks, completely free, ready to use immediately. The PDF will require the password to open.
Protect PDF FAQs
How do I protect a PDF file with a password online for free?
Simply upload your PDF file, enter a password, and click protect. Our free online PDF protector adds password protection instantly. No sign up required, no watermarks added. Protect PDF files online without losing quality.
Can I protect PDF files without losing quality?
Yes! Our PDF protector preserves the quality of all pages. Protect PDF files without losing quality - all pages, images, and text remain exactly as they were in the original file. Password protection is added without affecting document quality.
Is it really free to protect PDF files online?
Absolutely! PurePDF is 100% free to use with no hidden costs. You can protect as many PDF files as you want, as often as you need, completely free. No watermarks, no file size limits, and no sign up required.
Do I need to create an account to protect PDFs?
No sign up is required! You can start protecting PDF files immediately without creating an account. Our free online PDF protector works instantly - just upload, set password, and protect. Lock PDF files online without registration.
Will my protected PDF have watermarks?
No watermarks are ever added to your PDF files. When you protect PDFs with PurePDF, you get clean, professional documents without any branding or watermarks. Your protected PDF files are ready to use immediately.
What encryption is used to protect PDF files?
We use AES-128 encryption, which is an industry-standard encryption method. This provides strong security for your PDF files. Protect PDF files online with military-grade encryption.
Can I remove the password later?
Yes, you can use our Unlock PDF tool to remove password protection if you know the password. Simply upload the protected PDF and enter the password to unlock it. Protect and unlock PDF files as needed.
Ready to Protect Your PDF?
Add password protection instantly - 100% free, no sign up, no watermarks