Protect PDF with Password
Add password encryption to your PDF document in a few simple steps. Create a password, protect your file, and download your encrypted PDF.
Protect your document
Choose a PDF and set a password before downloading it.
Drop your PDF here
Drag and drop your file, or browse your device.
1. Create your password
Use a password you can safely remember.
2. Protect your PDF
Your file is processed locally in your browser.
This tool processes the selected PDF in your browser and does not send your document or password to an AngSimi upload server. An internet connection is needed to load the encryption library.
Apply PDF password encryption using the browser-based encryption library.
Select a PDF, enter and confirm a password, then download the protected copy.
Your protected PDF is saved to your device. The original file remains unchanged.
Frequently asked questions
Is this PDF protection tool free?
Yes. You can use this page without signing in or purchasing Premium.
Will my PDF be uploaded to AngSimi?
No. The page processes the selected PDF in your browser. The third-party encryption library is loaded over the internet, but your PDF and password are not intentionally sent to AngSimi's server.
What if I forget my password?
You may not be able to open your protected PDF. Store the password securely before protecting your file. AngSimi cannot recover a forgotten password for you.
Does this add a visual password prompt only?
No. The tool attempts to encrypt the PDF file itself using the encryption library. Always test the downloaded PDF in a compatible PDF reader before relying on it for important documents.
Can I protect a PDF that already has a password?
This version is intended for unencrypted PDFs. Unlock an existing protected PDF first using a compatible tool, then try again.
Is this a digital signature?
No. Password protection encrypts a PDF. It does not add a certificate-based digital signature or verify a person's identity.