PDF保護・パスワード設定
PDF保護・パスワード設定 online fast, free and secure.
Drag & drop PDF here, or click to browse
Client-Side AES & RC4 Encryption • Zero Server Uploads
document.pdf
0 KB
Passwords do not match.
AES-256 is supported by Adobe Acrobat, modern browsers, macOS Preview, and mobile devices.
PDF Successfully Encrypted!
Your PDF is now protected. Anyone opening the file will be prompted for your password.
How to use PDF保護・パスワード設定 in 3 simple steps
Select PDF Document
Choose or drag-and-drop the PDF document you want to lock and encrypt.
Set a Strong Password
Enter and confirm your chosen password. Our built-in strength meter evaluates character complexity in real time.
Encrypt & Download
Click Protect PDF to apply military-grade encryption directly in your browser, then download your password-protected PDF.
Key capabilities & features of PDF保護・パスワード設定
Robust Cryptographic Protection
Encrypt your documents using standard PDF encryption algorithms compatible with Adobe Acrobat, Apple Preview, and modern web browsers.
Real-Time Password Strength Meter
Interactive feedback guides you to choose resilient passwords with uppercase letters, numbers, and symbols.
Show / Hide Password Toggle
Verify password accuracy with a single click to avoid typing errors before encrypting your important files.
Universal PDF Reader Support
Protected PDFs prompt for a password when opened in any standard viewer across Windows, macOS, Linux, iOS, and Android.
Lossless Document Preservation
Encryption preserves fonts, form fields, page structure, and high-resolution media without alterations.
Absolute Privacy & Zero Server Uploads
Your passwords and files are never transmitted across the network or stored in external databases.