Protect PDF
Add a password to your PDF with AES-256 encryption directly in your browser.
Choose from your deviceDrag and drop a PDF here
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Protect PDF guide
How to password protect a PDF
Add a password to a PDF directly in your browser. Fylento encrypts the document with a 256-bit key so the password is required when the protected PDF is opened.
Add your PDF
Select one PDF from your device. Fylento checks that the file fits your local PDF limits before processing.
Choose and confirm a password
Enter the password you want to use, confirm it, and check the built-in strength indicator before continuing.
Protect and download
Fylento creates a new encrypted PDF and downloads it with “-protected” added to the file name.
AES-256 password protection
The current tool uses PDF encryption with a 256-bit key and sets the password you choose as the document's user password.
Password required to open
Compatible PDF readers will ask for the password before opening the protected document.
Your password is not stored by the tool
The password is used inside your browser while creating the encrypted PDF. Fylento does not upload the file or password for this operation.
Password strength feedback
The strength indicator considers password length, upper- and lowercase letters, numbers, and symbols to help you choose a stronger password.
Keep the password somewhere safe
Fylento cannot recover a forgotten PDF password for you. Store it somewhere secure before relying on the protected copy.
Protect PDFs privately in your browser
PDF encryption happens on your device. The document and password do not need to be sent to a remote conversion server just to add password protection.
Local PDF encryption
Fylento loads its PDF encryption toolkit in the browser and creates the protected output locally.
One file at a time
The current Protect PDF workflow handles one PDF per operation so you can choose and confirm the password carefully for that document.
When password protecting a PDF is useful
Password protection can help when you need to restrict who can open a document before you share or archive it.
Protect PDF FAQ
What encryption does Fylento use?
The current Protect PDF tool uses PDF encryption with a 256-bit key and presents the result as AES-256 protected.
Does the password have to meet a minimum length?
The tool requires a non-empty password and matching confirmation. The strength meter rewards longer passwords and a mix of character types, but it does not currently enforce a specific minimum length.
Does Fylento upload my PDF or password?
No. The PDF and password are processed locally in your browser for this tool.
Can Fylento recover my password if I forget it?
No. Because the password is not stored by this tool, Fylento cannot retrieve it later. Keep a secure copy of the password.
Can I remove the password later?
Yes, if you know the password and have permission to remove the protection, use Fylento's Unlock PDF tool.
Related PDF tools
Prepare the document before protecting it or remove protection later when you have the password and permission.
Unlock PDF
Remove password protection from a PDF when you know the password and are authorized to unlock it.
Compress PDF
Reduce the PDF size before adding password protection when you need a smaller file for sharing.
Merge PDF
Combine related PDFs into one document before protecting the finished file.
Redact PDF
Remove visible sensitive content from a PDF before sharing the protected document.