PDF Password Protector - Free Desktop App
Add password protection to PDFs with AES-256 encryption. Control printing, copying, editing permissions. No uploads, works offline.
Protect Your PDF
Bank-grade AES-256 encryption
Your PDF will be protected with military-grade encryption. Set separate passwords for opening and editing, with granular permission controls.
Note: All processing happens locally on your computer. Your password never leaves your device.
Why Desktop PDF Protector Beats Online Tools
| Feature | Online Tools | Diwadi Desktop |
|---|---|---|
| Upload Required | ❌ Required | 🎯 Never |
| File Size Limit | ❌ 50MB max | ♾️ Unlimited |
| Speed | ⏳ Slow (upload/download) | ⚡ Instant |
| Batch Processing | ❌ 1 file | ✅ 1000s |
| Privacy | ⚠️ Risky (cloud upload) | 🔒 100% Local |
| AI Features | ❌ No | 🤖 Yes |
| Offline | ❌ No | ✅ Yes |
| Cost | Free | Free ✅ |
How It Works
Download & Install
Takes just 30 seconds. No account, no credit card required.
Browse & Select Your PDF File
Navigate your files like a regular file browser. Batch processing supported.
Get Password-Protected PDF (Instant)
Processing happens locally on your computer. No upload wait.
Enterprise-Grade Security
Protect your documents with industry-standard encryption
Open Password
Require a password to open and view the PDF. Without the password, the document cannot be read.
Owner Password
Set a separate password to control permissions like printing, copying, and editing.
AES-256 Encryption
Military-grade encryption that would take billions of years to crack with current technology.
Granular Permission Controls
Decide exactly what recipients can do with your PDF
Printing Control
Allow or prevent printing. Choose high-quality or low-resolution only.
Copy Prevention
Prevent text and image copying to stop unauthorized redistribution.
Edit Protection
Lock the document to prevent any modifications or form filling.
Comment Control
Allow or prevent adding comments, annotations, and markup.
Protect Any Sensitive Document
From contracts to medical records, keep your documents secure
Legal Documents
Protect contracts, agreements, and legal filings with password encryption.
Financial Records
Secure bank statements, tax documents, and financial reports.
Medical Records
HIPAA-compliant protection for patient records and medical documents.
Corporate Documents
Protect business plans, strategies, and confidential reports.
Educational Materials
Secure exams, answer keys, and proprietary course materials.
Software Documentation
Protect technical specifications, API docs, and proprietary guides.
Why Choose Diwadi Desktop?
Privacy First
Files never leave your computer. No cloud upload, no data collection, 100% local.
Lightning Fast
Process files 10x faster than online tools. No upload wait, no download wait.
No Limits
Convert unlimited files of any size. Batch process thousands in one click.
AI-Powered
Smart formatting detection, auto-cleanup, better accuracy.
Works Offline
No internet required. Perfect for flights, secure environments.
Free to Use
No trial limits, no watermarks, no credit card required.
Frequently Asked Questions
Is the PDF protector really free?
Yes, completely free with no limits. Protect unlimited PDF files with passwords, as many times as you want. No watermarks, no signup, no credit card required.
How secure is the encryption?
Diwadi uses AES-256 encryption, the same standard used by banks and governments. It would take billions of years to crack with current computing technology.
Do my PDFs get uploaded to a server?
Never. All encryption happens locally on your computer. Your passwords and files never leave your device - critical for sensitive documents.
What's the difference between open and owner passwords?
Open password is required to view the document. Owner password controls permissions (printing, copying, editing) but isn't needed to open the file. You can set both for maximum control.
Can I remove password protection later?
Yes, use Diwadi's 'Unlock PDF' feature. You'll need the current password to remove protection.
Will protected PDFs work in all PDF readers?
Yes, password-protected PDFs work in Adobe Acrobat, Preview, Chrome, and all standard PDF readers. The recipient just needs to enter the password.
Does it work offline?
Yes, Diwadi works 100% offline after installation. No internet required - your passwords never touch a server.
What platforms are supported?
Mac (Apple Silicon and Intel), Windows (10, 11). Download the version for your operating system.