PDF Protector – Secure Your PDF Files with Password Protection
Add password protection to your PDF files quickly and securely
Protect Your PDF
How to protect your PDF:
- Upload your PDF file (max 50MB)
- Set a strong password for protection
- Configure security options
- Download your password-protected PDF
Drag & drop your PDF file here or click to browse
No file selected
Protection Complete!
Your PDF has been successfully protected with a password.
Security Features
PDF Protector – Free Online Tool to Password-Protect PDFs in 2025
PDF Protector is a free online tool that lets you password-protect your PDFs right away. It uses military-grade encryption and doesn't require you to log in.
Do you need to keep important papers like contracts, invoices, or personal records safe?
Our PDF Protector quickly adds an AES-256 password to your PDF, so only people who are allowed to can open or print it.
✅ Set a password to open (just for users)
✅ Encrypt with AES-256, which is the standard for the industry
✅ No file size limits (up to 25MB)
✅ No need to join up or see watermarks
[Protect My PDF Now]
Why Do You Need a PDF Protector?
- Keep client documents safe, like NDAs, contracts, and resumes
- Stop people from disclosing medical or financial details without permission
- Follow the rules of privacy (FERPA, GDPR, and HIPAA)
- Keep your intellectual property safe (such as e-books, reports, and designs)
- Send files safely using email or cloud storage
🔗 Edit before you protect: Use our PDF to Word Converter to make changes, then lock it securely
🔗 Verify document integrity with the AI Content & Plagiarism Checker
🔗 Summarize sensitive content first with the AI Text Summarizer
🔗 Compress large files after protection using the Compress PDF Tool
How It Works (Three Simple Steps)
- Upload your PDF
- Create a strong password
- Download your protected PDF, which is safe and ready to distribute
✅ Files are destroyed automatically after one hour
✅ Everything is done in your browser — nothing is sent to servers
✅ Works on both mobile and desktop
Main Features
| 100% Free | No hidden costs or premium tiers |
| No Login Required | Use instantly — no email or sign-up |
| AES-256 Encryption | Military-grade, bank-level security |
| Open-Password Only | Simple, universal protection |
| Universal Compatibility | Works with all major PDF readers |
| 100% Private | Files never stored, logged, or monitored |
| Mobile-Friendly | Works flawlessly on all devices |
Frequently Asked Questions
Q: Is this PDF Protector really free?
A: Yes, it's completely free, you don't have to join up, and you can use it as much as you like.
Q: Can anyone get the password?
A: No, AES-256 encryption is virtually unbreakable with current technology.
Q: Will it work with all PDF readers?
A: Yes, password-protected PDFs open seamlessly in Adobe Acrobat, Preview (Mac), Chrome, Firefox, and other standard viewers.
Q: Is my file safe?
A: Yes, for sure. Your PDF is never uploaded to our servers — encryption happens entirely in your browser.
✅ Try the greatest PDF Protector of 2025. It's quick, free, and necessary for safe document sharing.
[Lock My PDF Now]
🔗 For guidance on secure document handling and encryption standards, refer to NIST – Advanced Encryption Standard (AES) .