You Received a Password-Protected PDF: How to Open It

Your accountant, lawyer, agent or HR department sent you a PDF, and when you try to open it, a window asks for a password. That’s expected: the document holds personal information, and the sender protected it so that only you can read it. Here is how to open it on a computer or a phone, and what to do if the password is refused.

Why this PDF asks for a password

An email can be forwarded, read on a shared computer, or sit in an inbox for years. When a document contains financial statements, a tax return, a payslip or an ID, the sender encrypts it with a password. Without that password, the file’s content stays unreadable, even to someone who gets into your mailbox.

That’s why the password is never in the same email as the file. You received it another way: by text message, over the phone, at a meeting, or in an earlier message if the sender uses the same password for all your documents.

Opening the PDF on a computer

1. Save the attachment first to your computer. Some email apps can’t show protected PDFs in their built-in preview.
2. Open the file with a double-click. It opens in your computer’s PDF reader. You can also drag it into your web browser window, which can read PDFs.
3. Type the password when the window asks for it, then confirm.

The document then displays normally. The password is asked again each time you open it: that’s how the protection works, not a problem.

Opening the PDF on a phone

Tap the attachment in your email app. The phone opens the PDF in its reader and shows the same prompt. If nothing appears, save the file to your documents first, then open it from the phone’s files app.

The password is refused: the most common causes

• Upper or lower case. Passwords are case-sensitive. Check that Caps Lock is off.
• An extra space. Copying the password from a text or an email often picks up a space at the start or the end. Type it by hand to check.
• Look-alike characters. The digit 0 and the letter O, the digit 1 and the letter l, a hyphen and a dash.
• The password from another sender. If several people send you documents, each one has its own password.
• An outdated reader. PDFs protected with AES-256 need an up-to-date reader. If yours doesn’t even offer a password field, update it or open the file in your browser.

You lost the password

Ask the sender, ideally by phone or text message. Nobody else can give it to you: that is exactly what protects your information. Avoid asking for it by replying to the email that carried the file, so the file and its password don’t end up in the same thread.

To stop hunting for it, save it in your phone’s or browser’s password manager under the sender’s name. Many firms keep the same password for a client from one send-out to the next.

Sending protected PDFs? The message to include

If you are on the other side, an accountant, lawyer, agent or payroll manager, a clear message heads off most phone calls. For example, in the email that goes with the file:

Hello,

Here is your document, password-protected to keep your information private.
The password is sent to you separately, by text message.
To open it: save the attachment, open it, then type the password.
If the password is refused, check capital letters and spaces,
or give me a call.

You can also include the link to this page. For text message templates and the right way to share the password, see our guide sending a PDF password separately.

PDF Protect Plus protects a whole batch in one run, with each client’s own password, and creates a sending summary that lists which client gets which file, with no passwords in it.

The full method is in the article password-protecting a batch of client PDFs, one password per client, and the protection happens entirely on your computer.

In short

1. Save the attachment, then open it.
2. Type the password you received through a channel other than email.
3. Refused? Check capitals, spaces and look-alike characters.
4. Lost? Ask the sender, by phone or text message.