Free PDF Unlocker & Password Protector — Remove Password or Encrypt PDF

Overview: Unlock Locked PDFs or Encrypt Documents with AES-256

Remove passwords from locked PDFs or encrypt documents with military-grade 256-bit AES protection. All computations and data processing are executed 100% locally on your device using client-side WebAssembly, HTML5 Canvas, and modern Web APIs without uploading files to any external server.

Supported Formats

PDF Password Protect & Unlock supports the following file formats:

  • .pdf — client-side processing support.
  • .enc — client-side processing support.

How to Use PDF Password Protect & Unlock in Browser

  1. Select File: Upload your locked PDF or choose any document to encrypt.
  2. Enter Password: Type the existing password to unlock, or enter a new master password to encrypt.
  3. Process: Download the unlocked or AES-encrypted document immediately.

Key Features & Privacy Protections

  • 100% Client-Side Privacy: Zero cloud upload. Your documents, photos, and files never leave your local browser sandbox.
  • Zero Installation: Runs instantly in Chrome, Safari, Firefox, Edge, Android, and iOS browsers.
  • Free Forever: No sign-up, no subscriptions, no ads, and no file size limits.

Frequently Asked Questions (FAQ)

Is my password or document ever sent across the internet?

No. Decryption and 256-bit AES-GCM encryption run 100% locally via the Web Crypto API. Neither your password nor your document is ever transmitted.

How do I unlock a PDF whose password I know?

Upload the file, enter your current document password, and click 'Unlock & Remove Password'. A clean, unrestricted PDF without password prompts is generated immediately.

What encryption standard is used to protect PDFs?

We use industry-standard 256-bit AES-GCM authenticated encryption with PBKDF2 key derivation (100,000 iterations) for military-grade data protection.

Can I open the AES-protected file on any device?

Yes, you can use our tool to decrypt the file anytime on desktop or mobile by providing the password.

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PDF Password Protect & Unlock

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v1.0.0Free · Web CryptoPDF Tools

Free PDF Unlocker & Password Protector — Remove Password or Encrypt PDF

Unlock Locked PDFs or Encrypt Documents with AES-256. Remove passwords from locked PDFs or encrypt documents with military-grade 256-bit AES protection.

What is PDF Protect and what does it do?

The PDF Password Protection Tool provides military-grade client-side encryption to safeguard sensitive documents against unauthorized access, viewing, and confidential data leakage.

By operating entirely in your browser using standardized cryptographic PDF specifications, the tool encrypts documents with your custom user password without transmitting the document or the password across the internet.

  • Encrypt any standard PDF document with strong password protection to prevent unauthorized opening.
  • Real-time password strength meter evaluating length, diversity, and entropy to ensure resilient passwords.
  • Optional reveal/hide toggle for password input to prevent typing errors during document locking.
  • Preserves original document formatting, embedded vector fonts, graphics, and interactive bookmarks.
  • Completely private client-side processing ensuring confidential financial, legal, and medical documents remain confidential.

How does PDF Protect work?

The document binary is ingested into memory using pdf-lib. Cryptographic key derivation and standard PDF cipher dictionaries are initialized using the user's supplied password string.

Document content streams and cross-reference tables are encrypted according to PDF specification standards. The resulting encrypted binary package is returned directly as a local download blob.

100% private: all processing happens locally in your browser using client-side WebAssembly, HTML5 Canvas, and modern Web APIs. Your files are never uploaded to any server.

Who needs PDF Protect?

HR & Payroll Specialists

Lock employee salary slips, performance reviews, and sensitive personnel records before emailing them internally.

Corporate Executives & Board Members

Password-protect strategic planning documents, board meeting minutes, and merger & acquisition proposals.

Medical & Healthcare Providers

Comply with patient data privacy regulations (HIPAA/GDPR) when sharing digital medical records and health summaries.

Tax Professionals & CPAs

Secure tax return filings, bank account records, and confidential 1099/W-2 tax forms sent to clients.

Supported file formats

PDF Password Protect & Unlock processes the following file extensions and data formats directly in your browser:

.pdf.enc

How to use PDF Protect — step by step

  1. 1

    Select File

    Upload your locked PDF or choose any document to encrypt.

  2. 2

    Enter Password

    Type the existing password to unlock, or enter a new master password to encrypt.

  3. 3

    Process

    Download the unlocked or AES-encrypted document immediately.

Frequently asked questions

Is my password or document ever sent across the internet?

No. Decryption and 256-bit AES-GCM encryption run 100% locally via the Web Crypto API. Neither your password nor your document is ever transmitted.

How do I unlock a PDF whose password I know?

Upload the file, enter your current document password, and click 'Unlock & Remove Password'. A clean, unrestricted PDF without password prompts is generated immediately.

What encryption standard is used to protect PDFs?

We use industry-standard 256-bit AES-GCM authenticated encryption with PBKDF2 key derivation (100,000 iterations) for military-grade data protection.

Can I open the AES-protected file on any device?

Yes, you can use our tool to decrypt the file anytime on desktop or mobile by providing the password.

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