Add a strong password to any PDF in seconds. PDF2Tool encrypts your file with AES so only people with the password can open it — perfect for contracts, invoices, and confidential reports.
How to use Protect PDF
Upload the PDF you want to protect.
Enter the password you want recipients to type when opening the file.
Click Protect and download your password-protected PDF.
Frequently Asked Questions
How strong is the encryption?
PDF2Tool uses real AES encryption — the same standard used by banks. Without the password, the document cannot be opened, copied, or printed.
What happens if I forget the password?
There is no recovery. If you forget the password, you'll have to use the original unprotected file. Always store passwords in a password manager.
Can I remove a password I set later?
Yes. Use our Unlock PDF tool, enter the password, and download the unprotected version.
Will protected PDFs open in any reader?
Yes. Adobe Acrobat, Preview, Chrome, Edge, and every major PDF reader support password-protected PDFs.
Are my files private and secure?
Yes. Files are processed in your browser whenever possible, and any file uploaded for server-side conversion is automatically deleted within 30 minutes. We never share, sell, or read your documents.
Does it work on mobile?
Yes. PDF2Tool runs entirely in the browser and works on any modern phone, tablet, laptop, or desktop — no app required.