Protect PDF
Protect PDF adds a password to a PDF file, so only someone who has the password can open it -- useful before emailing a document with sensitive information.
How to convert Protect PDF
- Select your PDF file from your device, or drag it into the box above.
- KuickKonvert converts it automatically -- there's nothing else to configure beyond the options above.
- Your PDF file downloads straight away. The original is deleted from our servers as soon as the conversion finishes.
Supported formats
| Format | Supported |
|---|---|
| Yes |
Good to know
The file is encrypted with a password you choose (at least 4 characters) using standard 128-bit PDF encryption. Keep the password somewhere safe -- if it's lost, the file can't be opened or recovered by KuickKonvert, since we don't keep a copy of your file or password.
When you'd use this
- Password-protecting a document with personal or financial details before emailing it.
- Restricting who can open a contract before it's signed.
- Adding a basic layer of protection to a file shared over an unsecured channel.
Privacy & security
Your file is used only to perform this conversion, in an isolated temporary workspace, and is deleted automatically as soon as the converted file is returned to you (or immediately if the conversion fails). See our Privacy notice for details.
Frequently asked questions
What encryption does this use?
Standard 128-bit PDF encryption, applied with the password you choose.
What if I forget the password?
There's no way to recover it -- we don't keep a copy of your file or password after the conversion finishes, so choose a password you'll remember or store securely.
Is password-protecting a PDF online really free here?
Yes -- Protect PDF, like every tool on KuickKonvert, is completely free with no sign-up, subscription, or hidden limits beyond the 50MB file size cap.
Do I need to install anything?
No -- upload your PDF from your browser, choose a password, and download the protected file. The encryption runs on our server; nothing is installed on your device.