PDNob Online is currently available only on Windows and Mac desktop computers. Please switch to a desktop browser to use our features.
Founded in 2007, Tenorshare PDNob is trusted by millions to simplify work.
Protect PDF Online
Edit protected PDF or create password protected PDF online for free.
- 100% Free
- Secure & Private
- Easy to Use
4,368,933 files have been successfully protected for free.
Get PDNob Desktop, Your All-in-One PDF Solution!
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Desktop: Fast & Smooth – Large PDFs, zero lag.
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Batch & Automation: save valuable time.
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Full-featured: convert, edit, AI OCR, annotate, compress, etc.
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Advanced OCR: 99% high accuracy OCR.
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Secure & Stable: Work offline with full functionality.
How to Password Protect a PDF for Free?
Just 3 simple steps to encrypt and lock your PDF files online:
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Step 1
Choose your PDF files to upload on PDNob online.
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Step 2
Set a single password for all files or assign unique passwords to each.
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Step 3
Click “Protect PDF” to encrypt and instantly download your secured PDFs.
Why PDNob Stands Out
Quick, safe, and easy PDF protection with batch encryption and strong privacy.
Strong Password Encryption
Protect your PDFs with AES-256 encryption to block unauthorized access, editing, or printing. Keep your important documents safe and secure.
Batch PDF Encryption
Encrypt multiple PDF files at once. Set one password for all files or assign unique passwords to each. Flexible and convenient, far beyond similar tools.
Fast and Easy
Complete encryption within seconds. No technical skills required, and works smoothly on all devices including mobile.
No Installation Needed
Fully online with no downloads or plugins required. Works on Windows, macOS, Linux, Android, and iOS - protect your PDFs anytime, anywhere.
Clean Interface
Easy-to-use and no ads. No confusing steps or redirects. Just simple and fast PDF protection.
Privacy First
Your privacy matters. All uploaded files are automatically deleted from our servers to ensure your files are never saved or leaked.
Need More Than PDF Protection?
Try a Best PDF Editor for Professional.
This AI-powered PDF editor offers advanced editing, smart annotations,precise OCR scanning, and batch processing, etc —all offline. Ideal for students, professionals, and efficient document management.
FAQs about PDNob Free PDF Password Protection
How do I password protect a PDF using PDNob?
Simply upload your PDF files, set a password for one or all files, and click “Protect PDF” to encrypt and download your secured PDFs.
Is PDNob’s PDF password protection truly free?
Yes, PDNob provides 100% free online PDF password protection with no hidden fees, no usage limits, and no registration required, making it easy and accessible for everyone.
Can I add different passwords to multiple PDF files at once?
Yes, PDNob supports batch encryption where you can assign unique passwords to each PDF file or set one password for all.
Is it safe to protect PDFs with PDNob?
Yes,your privacy is our top priority. All uploaded files are automatically deleted from PDNob’s servers after processing to ensure your data is safe and never stored.
How do I know if my PDF is successfully password protected?
After encryption, try opening the PDF. You will be prompted to enter the password you set to access the file.
Can I use PDNob on my desktop for offline PDF protection?
Yes! PDNob Desktop offers the same powerful PDF password protection features without needing an internet connection. It’s perfect for users who prefer offline, faster, and more secure PDF encryption.
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