PDF Security
Encrypt PDF
Encrypt a PDF with AES-256 and control printing, copying and editing permissions.
Open toolPassword Protect a PDF
Add a password so the PDF can only be opened by people who know it.
PDF Security
Drag & drop your PDF file here
PDF · up to 50 MB
Add a file to get started.
About Protect PDF
Protect contracts, medical records or financial statements before sending them by email or cloud storage. Once protected, the PDF can only be opened with the password you choose.
Encryption uses AES-256, the strongest standard in the PDF format, and runs entirely in your browser. PDFToolsHub never sees your file or your password, so keep the password safe — it can't be recovered.
How to use Protect PDF
Add your file
Drag and drop one PDF file onto the upload area, or click “Select file” to choose from your device.
Set a password
Type a password and confirm it. Use 8 or more characters for better security.
Click “Protect PDF”
Start processing and wait a moment while your file is prepared.
Download the result
Save the finished file to your device with the Download button.
Protect PDF features
Processed in your browser
Your files are processed on your own device and are not uploaded to our servers.
No account needed
There's nothing to sign up for. Open the page and use the tool.
Works on any device
Use it on desktop, tablet or phone in any modern browser.
Protect PDF FAQ
Protect PDF accepts one PDF file. Each file can be up to 50 MB. Files are checked when you add them, so anything that isn't a valid PDF file is rejected with an explanation.
No. Protect PDF runs in your browser, so your files stay on your device.
Your PDF is encrypted with AES-256, the strongest encryption standard in the PDF format. It can only be opened with the password. Anyone with the password can open, print and copy it — to restrict those, use Encrypt PDF.
It can't be recovered — not by us or anyone else. PDFToolsHub never sees or stores your password, so keep it somewhere safe before sharing the file.