How to Password-Protect a PDF (Free, 2 Ways)

You can password-protect a PDF for free without Adobe Acrobat. Use Microsoft Word to encrypt a document you created, or an online tool like Smallpdf or iLovePDF to protect a finished PDF. Both methods let you restrict printing and copying too. Here’s how, plus how to choose a strong password.

Which method should you use?

Method 1: Protect a PDF online (any device)

Use for PDFs you already have — works on Windows, Mac, and phones.

1. Open Smallpdf Protect or iLovePDF Protect.
2. Upload your PDF.
3. Enter a password (use at least 10–12 characters).
4. Choose what to allow: printing, copying text, modifying.
5. Click Protect / Encrypt, then download the secured PDF.

Privacy note: For sensitive documents, prefer offline methods. Online tools process files on their servers.

Method 2: Microsoft Word (offline, no upload)

Useful when you still have the original Word/Google Docs file and want to keep it local.

1. Open the file in Word (or export from Google Docs as .docx first).
2. Click File → Info → Protect Document → Encrypt with Password.
3. Enter and confirm a password, then Save.
4. Click File → Save As, set the type to PDF, then click Options, tick Encrypt the document with a password, enter and confirm the password, and click Save. (The Info-menu password alone does not carry over to the exported PDF.)

Method 3: Mac Preview (offline)

1. Open the PDF in Preview.
2. File → Export → click Show Details (or Permissions).
3. Tick Encrypt, enter a password, and optionally set permissions.
4. Click Save.

This gives you a fully offline option on a Mac with fine-grained permission controls.

What password protection actually does

Encryption locks the file so it can’t be opened without the password. PDF passwords come in two types:

• Open password (“user password”) — required just to view the file.
• Permissions password (“owner password”) — restricts printing and copying but doesn’t prevent viewing.

Most consumer tools set both with one password. Modern tools use AES-256 encryption, which is effectively unbreakable without the password.

If you’ve forgotten a password, there’s no legitimate way back in — see how to edit a PDF for what is possible on a protected file. If your PDF is only locked against editing, reduce its size first so it’s easier to share.

Encrypt vs. redact: “Encrypt / password-protect” locks the whole file behind a password. To permanently remove specific text instead, you need a redaction tool — a different job.

How to choose a strong PDF password

A good PDF password is long and unguessable:

• Use 12+ characters mixing upper/lowercase, numbers, and symbols.
• A passphrase (“Draft-Q4-budget-2026!”) beats a short random string and is easier to remember.
• Avoid names, birthdays, and dictionary words.
• Store it in a password manager — if you lose it, the file is unrecoverable.

Common problems and fixes

FAQ

Is password-protecting a PDF free?

Yes. Online tools offer it free with daily limits, and Microsoft Word and Mac Preview do it offline with no limits.

Can I remove a password from a PDF I own?

Yes — most PDF tools have a “Remove password / Unlock” option, but you must know the password. Forgetting it means the file is unrecoverable without brute force.

What’s the strongest password for a PDF?

Use a phrase or string of 12+ characters mixing uppercase, lowercase, and numbers — e.g. Draft-Q4-budget-2026!. Avoid names, birthdays, and common words.

Do password-protected PDFs protect against screen recording?

No. Anyone who can view the file can screenshot or record it. Password protection stops opening and editing, not screen capture.

What’s the difference between protecting and encrypting a PDF?

For most tools they’re the same — setting a password encrypts the file so it can’t be read without it. “Password-protect” and “encrypt” describe the same action.

Can I encrypt a scanned PDF?

Yes — password protection works on any PDF, scanned or text-based. If you want the text selectable too, run OCR first, then protect it.

Can I password-protect a PDF in Google Drive?

Not directly — Google Drive only lets you restrict who can view a file (right-click → Share → Restricted). That’s access control, not encryption. Use Smallpdf, iLovePDF, or Word for a real password.

How do I hide specific text instead of locking the whole file?

Use a redaction tool, not encryption. Redaction permanently removes content; encryption locks the whole file. They solve different problems.

Can I password-protect a PDF on my phone?

Yes — the Smallpdf and iLovePDF mobile apps add password protection on iOS and Android, free with limits.