Protect workspace
Password-Protect PDFs in Seconds
Drop a PDF, choose a password, and download a locked copy—100% free and browser based.
Drop PDF or click to upload
Files stay on your device
AES-128 • Browser based
100%
Free Forever
No hidden costs
0
Sign Up Required
Start instantly
100%
Browser Based
Files never upload
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.
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.
Can I protect PDF files without losing quality?
Yes! Our PDF protector preserves the quality of all pages. 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. 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. Just upload, set password, and protect. Lock PDF files online without registration.
Will my protected PDF have watermarks?
No watermarks are added to your PDF files. Your protected PDFs are ready to use immediately.
What encryption is used to protect PDF files?
We use AES-128 encryption, an industry-standard encryption method that provides strong security for your PDF files.
Can I remove the password later?
Yes, you can use our Unlock PDF tool to remove password protection if you know the password.
Ready to Protect Your PDF?
Add password protection instantly - 100% free, no sign up, no watermarks.