How do I password-protect a PDF to prevent unauthorized opening?

Upload your PDF to PDF Legacy, set an open password, and download the encrypted file. Without the password, nobody can view the document contents.

Can I restrict printing and copying in a PDF?

Yes. PDF Legacy lets you set permission passwords. Disable print, copy, and edit functions while still allowing the document to be viewed by authorized users.

Is PDF Legacy's password protection secure for legal documents?

PDF Legacy uses AES-256 encryption — the industry standard. It's suitable for contracts, financial records, and sensitive business documents requiring confidentiality.

How do I send a password-protected PDF via email securely?

Encrypt the PDF with PDF Legacy, then send the file via email. Share the password through a separate channel (SMS, phone call, or different email) for security.

Can I remove password protection later if I change my mind?

Yes. Use PDF Legacy's Unlock tool with the original password to remove protection. Keep your passwords safe — lost passwords cannot be recovered.

WorkspaceKnowledge Base

Edit & Optimize · Security

Protect PDF with password

Add AES-256 encryption, set open & permissions passwords, control who can print or edit

Upload

›

Protect

›

Download

Drop your PDF to password protect

Set open & permissions passwords — AES-256 encryption
100% secure · Processed locally · Zero retention

Accepts:PDFAny PDF

Files never stored · End-to-end encrypted

#HOW IT WORKS

How to password protect PDF files online

Three simple steps to add AES-256 encryption, open passwords, and print/copy locks.

Upload your PDF document

Click Browse file or drag your PDF directly into the secure upload area above.

Set password & permissions

Enter a strong open password and select optional restrictions like blocking text copying or printing.

Download your protected PDF

Click Protect PDF to encrypt your file with AES-256 and save it instantly to your computer.

#COMPARISON

PDF Legacy vs online PDF protection tools

How client-side document encryption compares to third-party cloud tools.

FEATURE COMPARISONCloud Encryption Tools

PDF Legacy Security EngineRECOMMENDED

File Security & Privacy

Uploads unencrypted tax documents, legal contracts, and financial statements to remote web servers.

Encrypts documents entirely inside your browser memory. Your unencrypted PDF never leaves your computer.

Encryption Strength

Uses outdated 48-bit or 128-bit RC4 ciphers to save server CPU cycles.

Applies industry-standard 256-bit AES encryption with secure key scheduling.

Granular Permission Locks

Locks all settings behind paid monthly subscriptions or account registration.

Customize printing, text copying, annotation, and editing permissions 100% free.

Processing Speed

Queues encryption operations behind cloud server processing pipelines.

Encrypts multi-page PDFs instantly using local browser JavaScript execution.

Cost & Restrictions

Limits file uploads and adds promotional watermarks on free tiers.

Unlimited document encryption with no watermarks, file limits, or hidden fees.

#KEY FEATURES

Military-grade PDF security & password protection

Protect sensitive tax filings, corporate contracts, medical records, and financial statements.

100% Client-Side Encryption

Your passwords and PDF files are encrypted locally in your web browser. Nothing is uploaded to external servers.

AES-256 Encryption Standard

Protect files using 256-bit AES encryption — the standard relied upon by banks and security experts.

Open & User Passwords

Prevent unauthorized opening by requiring a password before anyone can view document contents.

Print & Copy Restriction Flags

Disable text copying, printing, and document editing to control how recipients interact with your PDF.

Real-Time Password Strength Meter

Check your password strength dynamically to ensure maximum protection against brute-force attempts.

Zero Cloud Storage

No temporary files, server logs, or retained copies. Your confidential data stays 100% private.

#FAQ