How to Password Protect a PDF Without Adobe Acrobat

You've got a PDF with something private in it, a contract, an invoice, an ID scan, and you want to lock it with a password. The catch? You don't have Adobe Acrobat, and you're not about to pay for a subscription just to add one password. Good news: you don't need Adobe at all. Here are several free, reliable ways to do it.

Last checked: November 2, 2026. App menus and tool features change over time; steps may vary slightly by version.

Before you start: pick offline or online

There are two kinds of methods, and the right one depends on how sensitive your file is:

• Offline (on your own computer): nothing is uploaded anywhere. Best for confidential documents. Covered first below.
• Online (browser-based tools): fast and work on any device, but your file is uploaded to a third-party server. Fine for everyday files; avoid for highly sensitive ones.

If privacy matters, use an offline method. If convenience matters and the file isn't sensitive, an online tool is quicker.

Method 1: Mac (Preview): free and offline

If you're on a Mac, you already have everything you need. The built-in Preview app can encrypt a PDF with a password.

1. Open the PDF in Preview (double-click it).
2. In the menu bar, choose File → Export (or File → Export as PDF).
3. In the save dialog, tick the Encrypt (or Permissions / Encrypt) option.
4. Enter and confirm your password.
5. Save the file, ideally under a new name so you keep an unprotected original.

That's it, no extra software, nothing uploaded. Anyone who opens the new file will be asked for the password.

Method 2: Microsoft Word (Windows or Mac): free with Office

If you have Microsoft Word, you can password protect a document as you save it to PDF.

1. Open the document in Word (if your PDF isn't a Word file, you may need to recreate or convert it first).
2. Choose File → Save As and pick PDF as the file type.
3. Click Options (or More options) in the save dialog.
4. Tick Encrypt the document with a password.
5. Enter your password and save.

This is a solid offline option if your content starts life in Word.

Method 3: Free print-to-PDF tools (Windows): offline

Windows doesn't include native PDF encryption, but free virtual-printer tools let you "print" any document to a password-protected PDF.

1. Install a reputable free PDF printer tool that supports encryption.
2. Open your document and choose Print.
3. Select the PDF printer as your printer.
4. In its settings, enable password / encryption and set your password.
5. Print, which saves an encrypted PDF.

Stick to well-known, actively maintained tools, and download them only from the official source to avoid bundled junk.

Method 4: Online tools (any device): fast and free

If you're on a Chromebook, phone, or just want the quickest route, trusted browser-based tools handle this in seconds. Both iLovePDF and Smallpdf have a "Protect PDF" tool:

1. Go to the tool's Protect PDF feature.
2. Upload your PDF.
3. Enter and confirm a password.
4. Download the protected file.
5. Delete the upload if the tool offers that option, and keep your original safe.

Not sure which service to use? We compare them in detail in iLovePDF vs Smallpdf. Just remember these upload your file to a server, so skip them for anything highly confidential.

Choosing a strong password

A password is only as good as its strength. Whichever method you use:

• Use a long passphrase (several random words) or 12+ mixed characters.
• Don't reuse a password you use elsewhere.
• Store it in a password manager so you don't lose access.

This matters because a weak PDF password can be guessed or brute-forced, which defeats the whole point. For more on locking down your accounts and devices, see our cybersecurity checklist.

Quick comparison of the methods

Removing a password later

If you need to unlock the file again, the same tools can usually remove the password, as long as you know it. Open the file, enter the password, and save or export an unprotected copy. This is exactly why you should store the password somewhere safe: without it, a properly encrypted PDF is very difficult to open.

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