Password Protect PDF Online — Free
Encrypt a PDF before you email or share it so only people with the password can open it. Add password to PDF files entirely in your browser: choose a passphrase, encrypt locally, and download the locked file. Free client-side protection means you can password protect PDF online without uploading sensitive contracts or IDs to a hosting service—and you can compress first if attachments need to stay under a size cap.
How it works
Select your PDF
Choose the PDF you want to encrypt. Processing happens on your device only.
Set a password
Enter and confirm a password that will be required to open the protected PDF.
Encrypt the PDF
Apply password protection client-side so unauthorized users cannot open the file.
Download the protected PDF
Save the encrypted PDF and share it only with people who know the password.
Frequently asked questions
How do I password protect a PDF online?
Select your PDF, enter a password, and encrypt. TeenyPDF applies protection in your browser and lets you download the secured file.
Is encrypt PDF free on TeenyPDF?
Yes. Encrypt PDF free with no account required. Processing stays on your device.
Can someone open the file without the password?
Not with standard PDF readers. Share the password through a separate channel so only intended recipients can open the document.
Does protecting upload my file?
No. Encryption is client-side. Your PDF never leaves your device while you add a password.