Lock PDF
Upload a PDF, set a password, and download a locked, password-protected copy.
Drop your PDF here to lock with a password
またはクリックして参照（複数ファイル可）
How to Password Protect PDF
Secure your documents in 3 simple steps.
Upload PDF
Select the PDF file you wish to protect with a password.
Set password
Enter a strong password. This password will be required to open the file.
Download protected PDF
Download your encrypted PDF file instantly.
Why use BytCrush PDF Locker?
Protect Sensitive Data
Prevent unauthorized access to confidential contracts, financial statements, or personal records by adding strong encryption.
Secure Sharing
Safely email or share documents. Even if the file is intercepted, it cannot be viewed without the correct password.
Client-Side Encryption
For maximum security, your password and file are processed securely. We never store your password or your documents.
Important Note
Please remember your password! Because we do not store it, we cannot recover it for you if it is lost or forgotten.
Frequently Asked Questions
Common questions about this tool.
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Unlock PDF
Remove password protection from PDF files you own.
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画像圧縮
画質を維持しながら画像ファイルサイズを削減。JPG, PNG, WEBPに対応。
自動圧縮
画像を特定のターゲットサイズ（KB）にインテリジェントに圧縮。厳しい制限に最適。
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