Protect & Unlock PDF
Password protect, decrypt, or change security keys on PDF documents locally using AES-256 encryption.
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How Protect & Unlock PDF Works
Upload your PDF document to the security workspace.
If locked, enter the existing password to unlock, remove protection, or set a new password.
If unprotected, enter a new password, configure permissions, and click Protect PDF to export an encrypted file.
Frequently Asked Questions
How does the PDF password tool work?
When you upload a PDF, the tool automatically detects whether it is password-protected. If locked, you can enter the current password to unlock or change it. If unprotected, you can set a new AES-256 password and restrict printing or copying.
Is my password or PDF sent to any server?
Never. All cryptographic hashing, AES-256 encryption, and decryption happen 100% locally in your browser using the Web Crypto API and client-side Web Workers. No file or password ever leaves your device.
What encryption standard is used?
We use standard AES-256 (Revision 6) PDF security conforming to ISO 32000-2 specifications, compatible with Adobe Acrobat, Apple Preview, and modern PDF readers.
Can I remove a password if I don't know it?
No. For ethical and security reasons, our tool does not crack passwords. You must provide the valid owner or user password to decrypt or modify the document.