Protect a PDF with a Password
Add a password to a PDF so only people who know it can open the file.
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Works with files up to roughly 100 MB, depending on your device's memory.
Protect PDF adds password encryption to your file so that anyone trying to open it needs the password you set. This is a straightforward way to keep sensitive documents like contracts, financial statements or personal records from being opened by the wrong person if the file is shared, emailed or left in a downloads folder. Upload your PDF, set a password, and click Protect — the tool encrypts the file using the standard PDF password mechanism recognized by common PDF readers, including web browsers. Download the protected file and share it as usual; anyone opening it will be prompted for the password you chose. Encryption happens entirely on your device, so your password and your document are never transmitted anywhere.
How it works
Upload your file
Drag and drop, or click to choose a file from your device.
Choose your options
Set the options for this tool — most tools work great with the defaults.
Download your PDF
Get your result instantly, processed right in your browser.
Frequently asked questions
What kind of password protection does this use?
The tool applies standard PDF password encryption that is recognized by common PDF readers and browsers when opening the file.
Will I be able to open the protected PDF in any reader?
Yes, any standard PDF viewer will prompt for the password before displaying the content.
Is my password sent to a server?
No, the password and the encryption process both happen locally in your browser.
What if I forget the password I set?
There's no way to recover a lost password — keep a copy of it somewhere safe, since this tool cannot unlock a file whose password you don't remember.