Encrypt PDF files with password protection. 256-bit AES security. Client-side processing. Mobile-friendly. No registration is required.

How to Protect PDF Online Free:

Here’s a super simple way to protect PDF online Free:

1. Do a Quick Web Search: First off, just jump onto your browser and type in something like “free protect PDF online” or “add password to PDF free online.” You’ll see a bunch of websites pop up, so pick one that looks secure and easy to use.
2. Find the Protection Tool: Once you’re on the site, you’ll need to find the specific tool for adding password protection. Look for something obvious like “Protect PDF” or “Add Password.”
3. Upload Your PDF: Next, you’ll see a button to upload your PDF file. Click on it and find the PDF you want to protect on your computer, then select it.
4. Set Your Secret Password: Now, you’ll usually get to type in the password you want to use to protect your PDF. Make sure it’s something you’ll remember, and you’ll probably have to type it in twice to confirm.
5. Apply the Protection: Once you’ve set your password, there will be a button to apply the protection. Click on that, and the tool will lock down your PDF.  
6. Download Your Secure PDF: Finally, you’ll see a button to download your newly password-protected PDF. Click it and save it to your computer. Just remember that password – you’ll need it to open the file later!