Web tool Bazar

PDF Locker – Choose Your Security Level

Password‑protect PDFs with Basic (RC4‑40), Standard (AES‑128), or High (AES‑256) encryption. All in your browser.

Basic Standard High (AES-256) No upload

Drag & Drop PDF Here

or click to browse (PDF only)

Max file size: 50MB

Set Password & Security Level

Encryption strength:

Basic
RC4‑40 (legacy)
Standard
AES‑128 (recommended)
High
AES‑256 (maximum)

File Status

No PDF selected

3 Security Levels

Choose Basic, Standard, or AES-256 High encryption.

AES-256 Ready

Military‑grade encryption for sensitive docs.

Lightning Fast

Encryption in milliseconds, even for large files.

Unlimited Uses

Lock as many PDFs as you want, free forever.

Free Online PDF Locker – Three Encryption Levels

Web tool Bazar’s PDF Locker now offers three distinct security levels to match your needs. Whether you need quick legacy compatibility or maximum protection with AES‑256, everything runs locally in your browser – your file never touches any server.

🔐 Encryption Levels Explained

  • Basic (RC4‑40): 40‑bit RC4 encryption. Suitable for very old PDF viewers (Acrobat 3 or 4). Minimal security – not recommended for sensitive data.
  • Standard (AES‑128): 128‑bit AES encryption. The default for most modern PDFs. Excellent balance of security and compatibility (Acrobat 7+). Recommended for everyday use.
  • High (AES‑256): 256‑bit AES encryption. Maximum security, compliant with PDF 2.0. Ideal for highly confidential documents (Acrobat X and later).

Select the level that fits your audience. If you’re unsure, choose Standard – it works everywhere and provides strong protection.

📋 Step-by-Step Guide

  1. Upload PDF – Drag & drop or click to select.
  2. Enter & confirm password – Use a strong password (mix of letters, numbers, symbols).
  3. Pick encryption level – Click Basic, Standard, or High card. Standard is active by default.
  4. Click “Lock PDF” – Watch the progress bar. The file is encrypted locally.
  5. Download – Save your password‑protected PDF. Test it with your reader.

⚙️ Features

  • 100% browser‑based, no uploads
  • Three encryption algorithms (RC4‑40, AES‑128, AES‑256)
  • Real‑time password strength indicator
  • Works offline after first load
  • Preserves original PDF content and formatting

❓ Frequently Asked Questions

Which level should I choose for banking documents?

High (AES‑256) offers the strongest protection. Ensure recipients use a modern PDF reader.

Will a Basic‑encrypted PDF open in any reader?

Most readers still support RC4‑40, but some newer ones may warn about weak encryption. Use Basic only for legacy systems.

Does encryption increase file size?

Usually very slightly – the overhead is negligible. The locked PDF is typically the same size or a few bytes larger.

Last updated: March 2026 | Words: ~800