In the old days, you’d need a dedicated application called a PDF reader to view PDF files – most people needed to install Adobe’s free Acrobat Reader (now called Adobe Reader) on their computers to open PDFs. Now, however, because PDF is an open standard, many devices and apps have built-in support for the format.
Below, we explain in simple terms how you can easily lock up your files with a secure password. Plus, discover how to annotate a PDF in case you need to email comments or suggestions.
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Each month, we feature one of the most popular questions answered by our Tech Support team.
Question of the month: how do I secure a PDF file?
'I've created a PDF document with personal information I need to send to my family. How can I add a password to this file so nobody else can access it?'
Which? Tech Support memberAdd a password to a PDF
On Windows
Tools Password OKSave
On Mac
Open WithPreviewFile ExportPermissionsRequire Password To Open DocumentOwner PasswordApply
News, deals and stuff the manuals don't tell you.
Do more with PDF files
Create your own PDFs File Save asEdit an existing PDF File OpenFile Open Annotate a PDF highlighter pen pen nib in a circle
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By remote fix By phone By email In print ou can .source https://www.which.co.uk/news/article/how-to-password-protect-a-pdf-file-aOgva9z8e7s9