Can I add password to PDF?

Yes, this tool lets you lock PDF files with a password.

Is password removal possible later?

Yes, you can remove the password using relevant tools.

Lock PDF & Add Password

Encrypt a PDF with a password (client-side). Files never leave your device.

or drag and drop here

(Your file stays on your device)

User password *

Confirm password *

Show passwords

Strength: —

Owner password (optional)

Allow printing Allow copying Allow annotations Allow modifying

Output filename

Remember my options (no passwords)

Optional PDF metadata

Lock PDF – Protect Your PDF Files with a Secure Password

PDF is one of the most widely shared document formats, used for contracts, reports, invoices, academic papers, legal documents, personal files, and confidential information. But not all PDFs are safe — once someone gets access to the file, they can view, copy, or share its content without permission. Our Lock PDF tool allows you to protect your PDF files with a strong password instantly. With a secure, encrypted password, your PDF becomes locked and accessible only to authorized users. No software installation or technical skills required.

If you need to remove an existing password, use Unlock PDF. For compressing your secure PDF afterward, try Compress PDF.

Why Lock a PDF?

A password-protected PDF ensures that only specific people can access your content. Whether you’re sharing personal records or confidential business files, locking the PDF adds an important security layer. Here are the major benefits of locking a PDF:

Prevent Unauthorized Access: Only users with the password can open the file.
Block Copying: Restrict others from copying your content.
Block Editing: Stop anyone from modifying the document.
Block Printing: Protect sensitive data from being printed.
Ensure Confidentiality: Ideal for personal, legal, or business-sensitive documents.

If you want to combine multiple protected PDFs later, use Merge PDF. To reorder or modify pages before locking, try Reorder PDF.

Types of PDF Protection

There are two major types of PDF protection you can apply:

Open Password: Required to open or view the PDF.
Permissions Password: Controls printing, copying, and editing rights.

Our tool supports setting both types of passwords depending on your needs.

Main Features of Our Lock PDF Tool

Our tool is designed for ease of use, security, and accuracy. It works perfectly for all types of PDF files — scanned documents, digital reports, forms, invoices, and more. Key features include:

Strong Encryption: Your PDF is protected using industry-standard encryption.
Open Password Protection: Users must enter a password to view the file.
Permissions Protection: Disable copying, editing, or printing.
No Software Needed: Works directly in the browser.
Instant Processing: Lock your PDF within seconds.
Mobile Friendly: Secure your PDF from any device.
No Watermarks: Your protected PDF stays clean and professional.
Secure File Handling: All files are encrypted and deleted automatically.
Free & Unlimited: Protect as many PDFs as you want.

If your PDF contains images that require conversion before protection, try JPG to PDF or PNG to PDF.

How to Lock a PDF (Step-by-Step Guide)

Protecting your PDF with a password is simple and requires no technical knowledge. Follow the steps below:

Click the “Upload PDF File” button.
Enter the password you want to use for protection.
Confirm the password to avoid mistakes.
Click “Lock PDF” to secure your document.
Download your newly protected PDF file instantly.

If you forget your password, you can remove the lock (only for your own files) using Unlock PDF.

Who Should Use the Lock PDF Tool?

Anyone who needs to secure their PDF files can benefit from this tool. Here are the most common user groups:

Students: Protect projects, assignments, and personal information.
Teachers: Lock exams, answer keys, and confidential files.
Businesses: Secure contracts, reports, financial data, and proposals.
Lawyers: Protect case files, affidavits, legal documents, and client records.
Designers: Protect portfolios, drafts, and creative work.
General Users: Lock personal documents, bills, certificates, and private files.

Frequently Asked Questions (FAQs)

1. Is the Lock PDF tool free?
Yes, this tool is free and allows unlimited PDF protection.

2. What encryption is used?
The tool uses strong industry-standard encryption for secure protection.

3. Will locking reduce the PDF quality?
No — the content, formatting, and clarity remain unchanged.

4. Can I lock a scanned PDF?
Yes, scanned PDFs are also supported.

5. Are my files secure?
Absolutely — all files are encrypted and permanently deleted after processing.

Conclusion

Our Lock PDF tool provides a simple, fast, and secure way to protect your PDF documents with a strong password. Whether you're securing personal, academic, or professional files, this tool ensures that only the right people can access your content. For additional PDF tools, explore Unlock PDF, Compress PDF, or Merge PDF. Start locking your PDFs today — safe, easy, and completely free!