What encryption does this tool use?

Helperzy uses 128-bit AES encryption, which is the industry standard for PDF security.

PDF mein password kaise lagaye free mein?

Helperzy pe apna PDF upload karo, password set karo, aur Protect dabao. Password-protected PDF turant download karo — bilkul free.

Can I restrict printing and copying in addition to a password?

Yes. You can set an owner password to restrict printing, copying text, and editing the PDF.

Will the password protection work in all PDF viewers?

Yes. The password protection is compatible with Adobe Acrobat, Preview (Mac), and all standard PDF viewers.

Free PDF Password Protection – Secure PDF Online

Add password protection to PDF files online for free. Secure your PDF documents with encryption.

How to Use Protect PDF

Upload Your PDF

Upload the PDF file you want to protect.

Set Password

Enter your desired password. Optionally restrict printing and copying.

Protect & Download

Click Protect PDF and download your encrypted, password-protected PDF.

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Secure Your PDF with Password Encryption

Helperzy PDF Protector adds password encryption to your PDF files, preventing unauthorized access. Set an open password (required to view the PDF) and optionally restrict printing, copying, and editing. Uses 128-bit AES encryption for strong security. Perfect for protecting sensitive documents, contracts, and confidential reports. The process runs entirely in your browser — no files uploaded to any server, no signup, completely free.

Frequently Asked Questions – Protect PDF

Upload your PDF to Helperzy PDF Protector, set your password, choose restrictions, and click Protect. Download your encrypted PDF instantly.

Professional standards, zero cost.

Helperzy is built for everyone — developers, students, and professionals who need fast, reliable tools without the friction.

Always Private

Browser-based tools run 100% on your device. Your files are never uploaded, never seen by us, never stored anywhere.

Edge Optimised

Processes are distributed across global edge nodes for minimum latency. Server-side files auto-deleted in 60 minutes.

Always Free

Every tool is free forever. No account, no credit card, no email required. Open a tool and start in seconds.

Works Everywhere

No software to install. All browser-based tools use modern Web APIs — fast, offline-capable, and always available.

Common Questions

Absolutely. For all browser-based tools your files never leave your device — processing happens entirely in your browser. For server-side tools like PDF to Word, files are encrypted in transit, processed in isolated memory, and permanently deleted within 60 minutes.

Get in touch

Have a tool request, found a bug, or want to report a security concern? We read every message and typically reply within 24 hours.

Tool requests & feature ideas
Bug reports & feedback
Security concerns or responsible disclosure
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