Email is not a locked drawer. A PDF with a bank statement, a contract or a scan of your passport can be forwarded, synced to other devices or opened by someone who happens to look over a shared inbox. Putting a password on the file is a simple extra layer that takes less than a minute. The reverse job matters just as much: many documents you receive are already password protected, and you may want a copy without the password for your own records.

Protecting a PDF

1. Open the Protect PDF tool and upload the file.
2. Type the password you want people to enter when they open the document.
3. Download the protected file and test it: open it and confirm it asks for the password.
4. Send the file and share the password through a different channel, for example by phone call or a separate chat message.

Choosing a good password

• Use at least 12 characters. A short phrase of unrelated words is easier to remember and harder to guess than a clever word with a number on the end.
• Do not use birthdays, phone numbers or the recipient's name.
• Never write the password in the same email as the attachment. That defeats the purpose.
• Keep the password. If you forget it, there is no honest way to get the content back. Store it in a password manager.

Opening or unlocking a protected PDF

If a file asks for a password and you have it, the Unlock PDF tool removes the password and gives you a normal copy. Typical cases are salary slips, bank or tax statements and government documents that arrive locked with a password made from your own details, such as part of your name and date of birth. The sender's email or letter normally explains the pattern. If you have dozens of locked files, you can list the file names and their passwords in an Excel sheet and unlock them in one batch.

When to remove the password

Remove protection from your own copy when you need to merge the file with others, add page numbers, sign it or convert it, because most tools cannot work on a locked file. Keep the protected version for sending and the unlocked version for your private archive, stored somewhere safe.

Password protection is not everything

A password keeps casual readers out. It does not stop the person who has the password from sharing the file. For documents that contain ID numbers, you can also hide the sensitive part before sharing: redact or mask numbers you do not need to disclose, and send only the pages that are required.