Protect PDF (Encrypt)
Add a password to your PDF file to prevent unauthorized opening.
PDF 파일 선택
안전하게 보호할 문서를 업로드하세요
✨ Convert
- User password (open)
- Owner password (edit permissions)
- AES-128 Encryption
- AES-256 Encryption
- Print restriction
💡 Info
**Zero Knowledge** We do not see your password or your file. Encryption happens on your CPU.
**Compliance** Meet data protection standards by encrypting sensitive files.
🚀 Usage
- 1
Upload PDF.
- 2
Enter a password.
- 3
Download encrypted PDF.
Overview
This tool is designed for fast, local processing with no server upload. It focuses on clarity and repeatable results.
When to use it
- • When you need a quick result without installing software.
- • When you must keep files on your device for privacy.
- • When you want a predictable output for reuse or sharing.
How it works
Your file is processed in the browser. The workflow is deterministic and optimized for common document patterns.
Best practices
- • Start with a small sample to confirm output expectations.
- • Keep file names simple to avoid OS-specific edge cases.
- • If results look off, try the tool again after a page refresh.
Common mistakes
- • Uploading encrypted or corrupted files without preparing them first.
- • Assuming a tool will fix formatting issues outside its scope.
- • Closing the tab before the download completes.
⚠️ Limits
- • Don't forget your password!
- • Cannot verify password strength
📥 Inputs & Outputs
Inputs
- PDF File Formats: pdf
- Password Formats: n/a
Outputs
- file Formats: pdf
🔒 Privacy & Security
- • Encryption is local.
🛠 Troubleshooting
Password lost?
It cannot be recovered if strong encryption is used.
Compatibility?
Works with all standard PDF viewers.
Error?
File might be corrupted.
❓ FAQ
Can it be cracked?
AES-128/256 is very secure against brute force.
Free?
Yes.
Server see pass?
No, never.
Batch?
One by one for security.
Mobile?
Yes.
Offline?
Yes.