Protect PDF
Encrypt PDFs with Password Protection
AES-256 encryption (PDF 2.0 standard)
How to use
- Upload your PDF file using the area above.
- Enter a password to protect your PDF.
- Click "Protect PDF".
- Wait a moment while we encrypt your PDF with the password.
- Download your protected PDF.
Why use this tool?
completely free, forever
No sign-up, no watermarks, and no daily limits.
Password Protection
Encrypt your PDF with a strong password to ensure security.
Easy & Fast
Add password protection to your PDFs in seconds.
Secure & Private
Your files are processed securely and deleted after protection.
All Devices
Works on Windows, Mac, iPhone, iPad, and Android devices.
Frequently asked questions
Is this PDF protection tool free?▼
Yes — 100%. All tools on dipsac.com are completely free. No account needed, no watermarks, no daily limits.
How do I protect a PDF with a password?▼
Upload your PDF, enter a password, and click 'Protect PDF' to encrypt your document.
Can I set any password I want?▼
Yes, you can set any password you'd like. Make sure to choose a strong password to secure your PDF effectively.
Is my PDF file secure during the protection process?▼
Yes, your files are processed securely and deleted after encryption to protect your privacy.
Which devices are supported?▼
Works on Windows, Mac, iPhone, iPad, and Android devices.
About Protect PDF with Password
Encrypt PDF files with a password online for free. Secure sensitive documents before sharing. This free online tool runs entirely in your browser — no files are ever uploaded to our servers, ensuring your data stays private and secure. No registration, no watermarks, no limits.
Free forever
No hidden fees or paywalls
Zero uploads
100% browser-based processing
No account needed
Start using immediately