Free Password Protect PDF Online
Add password protection to a PDF or unlock a protected PDF when you know the password. Use it when a document needs extra access control before sharing.
🔒 Password Protect / Unlock
Upload a PDF — protect with password or unlock with password
Drop PDF here
Frequently Asked Questions
Can I add a password to a PDF?
Yes. Use the protect PDF tool to create a password-protected output file.
Can this unlock any PDF?
No. You should only unlock PDFs when you know the password and have permission to edit the file.
Is password protection the same as encryption?
Password protection controls access to the PDF, but you should still follow your organization security rules for sensitive documents.
Should I use this for confidential documents?
Review the privacy notice and avoid using optional cloud or AI features for highly sensitive files.
Protect PDF Online Free | Encrypt & Add Password to PDF
Secure Your PDFs with Strong Password Protection Sending sensitive information via email or uploading confidential files to a portal? Adding a password is the best way to prevent unauthorized access. Our Free PDF Protector allows you to quickly encrypt your documents with a strong password. It’s an essential tool for digital product sellers, freelancers sending invoices, and businesses handling client data.
Enterprise-Level Security in Your Browser When you add a password using our tool, the encryption process happens entirely locally within your web browser. Unlike other services that upload your unencrypted files to their servers first, your document never leaves your device during the protection process. This zero-data-collection approach ensures maximum security for your most private files.
Features of Our PDF Protector:
Military-Grade Encryption: Lock your files securely so only authorized users can open them.
100% Local Processing: Your unencrypted files are never exposed to the internet or third-party servers.
No Sign-ups: Instantly protect your files without creating an account.
Completely Free: Secure as many documents as you want without paying for premium software.
How to Password Protect a PDF:
Drag and drop your PDF file into the secure upload zone.
Type a strong password in the designated input field.
Click “Protect & Download”.
Your newly encrypted, password-protected PDF will automatically save to your device.
- Need to make a quick correction or add a signature before locking your document? Use our secure Free PDF Text Replace.
PDF Workflow
Use the flagship PDF tools, then continue with AI, protection, compression, or business documents.