Keep sensitive documents safe. Our Protect PDF tool lets you add password protection to any PDF — ensuring only authorized people can open, view, or edit your files.
or click to browse. Processing happens 100% in your browser.
🔒 Your file stays on your device. We never see it.
Select your PDF.
Enter and confirm password.
Get your protected PDF.
Set a strong password.
AES-256 encryption.
Protect in seconds.
Password stays local.
Unprotected file • Anyone can open • Compliance risk
AES-256 encrypted • Password required • HIPAA ready
| Encryption | AES-256 |
|---|---|
| Password Policy | Minimum 8 chars |
| Method | WebAssembly crypto module |
| Processing Method | WebAssembly (WASM) |
| Browser Memory | < 512MB allocated |
| Supported PDF Versions | 1.4 through 2.0 |
| Output Quality | Lossless / 300 DPI |
| Feature | PDFDocStudio | Cloud Competitors |
|---|---|---|
| File Uploads | ❌ Never | ✅ Required |
| Account Needed | ❌ No | ✅ Often |
| HIPAA Friendly | ✅ Yes | ⚠️ BAA Required |
| Max File Size | 50MB | Varies |
| Price | Free | Freemium |
Browser memory constraints cap safe WebAssembly processing at ~50MB per file. Larger files risk crashing the tab. We're optimizing streaming algorithms to raise this to 200MB.
Never. Free outputs are identical to paid outputs. No watermarks, no ads injected into PDFs, no quality reduction.
We publish our Subresource Integrity (SRI) hashes in our GitHub repository. You can verify the WebAssembly binary hash matches our open-source release.
Since processing is local, a crash only affects the current session. Your original file remains untouched on your hard drive. Simply reopen the tool and re-upload.
100% free. 100% private. 100% in your browser.
Protect Your PDF Now