Password protect a PDF
Encrypt a PDF with a password.
How it works
- 1
Drop your PDF.
- 2
Choose a strong password.
- 3
Download the protected PDF.
Lock your PDF with a password using 256-bit AES encryption. The file is encrypted on your device and never uploaded.
Add a password before emailing sensitive documents such as contracts, payslips or IDs. We use standard AES-256 encryption through the open-source qpdf engine, entirely inside your browser, so neither your file nor your password ever reaches our servers.
What people use it for
- Email payslips, contracts or IDs more safely.
- Restrict who can open a confidential report.
- Store sensitive scans with a password.
Tips for best results
- Use a long, unique password and share it through another channel.
- We cannot recover a lost password, so keep it safe.
- Unlock PDF removes the password later when you no longer need it.
Your files never leave your device
Unlike most online PDF tools, Intelli File does not upload your documents to a server. Everything runs in your browser using your own device, so contracts, IDs and financial records stay private. Only a small usage counter is sent so we can apply daily limits.
Read how we handle privacyWhat to do next
After this, you may want to PDF properties, Flatten PDF, or Compress PDF.
Frequently asked questions
Can you recover my password?+
No. Encryption happens on your device and we never see the password, so keep it somewhere safe.
Which encryption is used?+
AES-256, the modern PDF standard supported by Acrobat, Preview and all major readers.
Will every PDF reader ask for the password?+
Yes. Acrobat, Preview, Chrome and other major viewers all support AES-256.
Can I change or remove the password later?+
Use Unlock PDF with the current password to remove it, then protect again with a new one.