Security Zero Server TransferClient Side WASM
Protect PDF
Encrypt your private PDF documents with standard RC4 128-bit encryption. Perfect for contracts, bank statements, legal forms, and confidential research.
Drop PDF to protect with password
Add industry-standard 128-bit encryption to your private files
Zero Server Transfer•Local RAM Sandbox
Execution Workflow
How to use Protect PDF in 3 steps
01
Upload Confidential PDF
Select your document. It stays strictly protected inside your local browser.
02
Set Strong Password
Enter a user password required to view and open the document.
03
Encrypt & Download
Click "Encrypt PDF Now" to generate an industry-standard password-protected file.
Architecture Analysis
AnTPDF vs Cloud Converters
| Capability | AnTPDF Client Studio | Legacy Cloud Services |
|---|---|---|
| Server Uploads | 0% (Local WASM) | 100% Uploaded to Cloud |
| File Size Limit | Unlimited (RAM Bound) | Capped at 15MB free |
| Daily Task Limits | Zero Paywalls | 2 tasks per day lock |
| Processing Speed | Sub Second Execution | Slow cloud queues |
| Execution Privacy | 100% In Browser RAM | Remote Cloud Server |
Documentation
Frequently Asked Questions
Impossible. The encryption cipher is executed strictly inside your local browser runtime. AnTPDF has no database, no backend server, and zero tracking.
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