How to password protect a PDF file
Upload a password-protected PDF with 256-bit AES encryption.
Enter a strong password to protect your PDF document. Set viewing and editing permissions if necessary.
Click the Protect PDF button, wait a few seconds, and your secured files are ready to download.
Free password protect PDF
Sometimes it is necessary to restrict access to a PDF file to most users and only allow those who know the password. With our PDF protector, you will be able to restrict PDF viewing.
Relentless encryption
We offer a reliable PDF encryption service that guarantees the highest level of security. Encrypt your PDF files with 256-bit AES encryption to prevent anyone from opening your PDF files without a password. There is no way to force or reverse engineer the password.
Security is our mission
We are concerned with the privacy and security of our users' files, especially when we talk about file protection. Therefore, we make sure that users set strong passwords, and we delete files automatically after each transfer.
Easy to use every day
We build tools for everyone. It doesn't matter who you are - everyone can easily use our software. We invest a lot to provide the best user experiences for all of you.
Lock a PDF file using Windows, Mac, iOS or Android
Protect PDF is an online site, so all major platforms are supported. Locking PDF has never been easier and more accessible than it is now with this free online PDF converter.
Lots of PDF Tools
We provide more online PDF tools: PDF to Word, PDF to Excel, file compressor, page remover and many other tools to help with your daily work.