Protect PDF
Encrypt your PDF files with AES security. Set passwords and restrict printing, copying, or modification.
Click or drag files here
Drop PDF files here to protect
Supported formats: PDF
This password will be required to open the document.
If set, this password is required to change permissions.
Security Strength
Files are encrypted using AES-256 bit encryption with granular permission controls.
Encrypt and Protect Your PDF Files
Sending a confidential contract or sensitive financial data? PlatinumPDF Protect PDF allows you to secure your document with strong AES encryption. By adding a password, you ensure that only the intended recipient can open the file. Because we process everything locally, your unencrypted file never travels across the internet, making this the safest way to protect your data.
Powerful Features
Strong Encryption
Uses industry-standard AES 128-bit encryption to lock your file contents securely.
Instant Protection
No uploads, no waiting. The encryption happens instantly on your own device.
Zero Knowledge
We never see your password or your file. You are the only one who holds the key.
Universal Compatibility
The protected PDFs can be opened by any standard reader (Adobe, Chrome, Preview) if the password is known.
Prevent Copying
Often used in conjunction with Flatten PDF to also prevent easy content extraction.
Simple Interface
Just type your password twice and click 'Protect'. It's that easy.
How to Password Protect a PDF
Upload PDF
Drag and drop your confidential file.
Set Password
Type a strong password. You'll need to confirm it to avoid typos.
Encrypt
Click 'Protect PDF'. Your browser will encrypt the file bytes.
Download
Save your locked document. Don't forget the password!
Who Can Benefit? (15+ Use Cases)
Security
- HR: Email employee contracts and salary slips securely by password protecting them.
- Finance: Protect bank statements and tax returns before archiving or sharing.
- Legal: Encrypt case files ensuring attorney-client privilege is maintained during transfer.
Personal
- ID Documents: Protect scans of your passport or ID before emailing them to agents.
- Journals: Lock your personal digital diary or creative writing drafts.
Real-World Scenarios
Frequently Asked Questions
Can you recover my password if I lose it?
No. Since we don't store your password or file, there is no way for us to recover it. Please remember your password!
How strong is the encryption?
We use standard PDF encryption compatible with modern readers. While very secure against casual access, no digital security is unbreakable against a determined state-level actor, but it is standard for business confidentiality.
Does it work on Mac and Windows?
Yes, the generated PDF is standard and works on all operating systems and devices.