Locking a PDF means adding password protection to the file so it cannot be opened or viewed without the correct password. This prevents unauthorized access to sensitive information.
Yes. The tool uses encryption and secure connections during processing. Files are handled safely and many services automatically delete them after completion to protect user privacy.
Yes. If you remember the password, you can later use an unlock PDF tool to remove or change the password whenever required.
No. Locking a PDF only increases its security. The content, formatting, layout, images, and text remain exactly the same.
Yes. Since the tool works directly in your browser, you can lock PDFs on smartphones and tablets without installing any apps.
If the password is forgotten, there is no simple way to open the file. It’s important to store your password securely to avoid losing access.
File size limits may vary by platform, but Lock PDF Free supports typical and fairly large PDF files without performance issues.
Lock PDF Free is ideal for businesses, students, professionals, freelancers, and anyone who needs to protect private or sensitive PDFs before sharing them online.
