I need to password protect my thesis PDF before submitting it but every method I try either fails or messes up the formatting on my laptop. Deadline is Friday and I can’t install anything new.
If you’re on a Mac, open it in Preview, choose File > Export, check “Encrypt,” and enter the password. If LibreOffice is already installed, its PDF export has a Security tab where you can set one without changing the layout. Also check the submission rules first, because some thesis portals reject encrypted PDFs. Keep an unprotected backup too, learned that one the hard way.
If your thesis is still a Word file, skip the third party stuff entirely, Word can do it itself. File, Save As, pick PDF, hit Options and tick “Encrypt with password”. Iteself the export keeps formatting identical. If it’s already a PDF and you’re on a Mac, Preview’s Export has an encrypt checkbox too. What OS are you on?
If you can’t install anything, PDFcap is probably the simplest option: upload the finished PDF, choose password protection, set an open password, then download the protected copy. Open that downloaded file once before submitting to make sure the password works and the pages still look right. Keep an unprotected original saved separately.
Formatting breaks because most free tricks re-render the PDF rather than just encrypting it. If your thesis is in Word, do File, Save As, PDF, then Options and tick “Encrypt the document with a password”; the layout stays identical because it’s the same export you already have. Use an open password only, not a permissions one, so screen readers and university checks don’t trip over it.
If you still have the thesis in Word, go to File > Info > Protect Document > Encrypt with Password, then save a protected copy, though that produces a Word file rather than a PDF. For an existing PDF on Windows with nothing to install, I would use your school’s submission portal if it offers encryption, or a browser-based PDF password tool and delete the uploaded file afterward. Open the finished PDF in Edge and test the password before submitting. I learned the hard way not to overwrite the original until that test works.
If you’re on a Mac, open it in Preview and use File > Export as PDF, then check the encryption box. That keeps formatting perfect and uses no extra software.
Quick question, are you on Windows or Mac? If Mac, Preview can do it without installing anything: File > Export as PDF, then click the little padlock/Permissions box and set a password. Keep a copy of the original first just in case it reflows any fonts weirdly.
@masterFox69 Agreed on open password only, a permissions one tripped my university’s accessibility check too. On my old laptop the Word export was the only thing that kept margins and bookmarks intact, not sure if Mac behaves the same.