Protect PDF
Encrypt your PDF with a secure password.
Select PDF file
Max 50MB
Set Password
Large files (near 50MB) may take longer.
Frequently Asked Questions
No. Only you know the password. If you forget it, the file cannot be opened. We do not store your password or file.
Yes. We use 128-bit AES encryption, which is the standard for securing PDF documents worldwide.
To ensure fast processing, the maximum file size allowed is 50MB.
Yes, PDF AI works on all devices including iOS and Android.
Yes, password protecting your PDF files is completely free.
No, we do not add any watermarks to your secured documents.
Your file is encrypted and then automatically deleted from our servers after 60 minutes for your privacy.