Password Protect a PDF on iPhone and iPad for Free

iOS does not include a way to add a password to a PDF. The Files app can view PDFs, the Markup feature can annotate them, but neither can encrypt them. Most PDF apps on the App Store that offer password protection either charge a subscription or upload your file to their servers.

The Protect PDF tool works in Safari on iPhone and iPad. Open the page, select your PDF, set a password, download the protected version. No app to install, no account to create, and your file stays on your device.

How to Add a Password to a PDF on iPhone

1. Open Safari and navigate to the Protect PDF page.
2. Tap the drop zone and choose "Choose File." Browse to your PDF — it can be in Files, iCloud Drive, or On My iPhone.
3. Enter a password and confirm it. Use something you will remember or store it in your password manager.
4. Tap "Protect PDF." The file is encrypted locally on your iPhone.
5. Tap "Download Protected PDF." Safari will download the file. Find it in the Downloads folder in the Files app.

From there, you can share the protected PDF via Mail, Messages, AirDrop, or any other sharing method. The recipient will be prompted for the password when they open it.

Working with email attachments: If someone emailed you a PDF and you want to add a password before forwarding it: save the attachment to Files first (long-press the attachment in Mail > Save to Files), then use the steps above.

Why iOS Does Not Have PDF Password Protection

Apple includes PDF password protection in macOS Preview but not in iOS. The Files app and Quick Look on iPhone can open password-protected PDFs (it prompts for the password), but they cannot create them.

The Shortcuts app cannot add PDF passwords either — there is no built-in action for PDF encryption in the Shortcuts library.

Third-party apps that offer this feature fall into two categories:

• Subscription apps (PDF Expert, PDF Pro, GoodNotes) — $5-10/month for full features including password protection. Overkill if you just need to lock one PDF.
• Free apps with ads and uploads — many free PDF apps upload your file to their servers for processing. Check the privacy policy — if they need an internet connection to add a password, your file is being uploaded.

The browser-based approach avoids both problems: it is free with no ads (just a small banner), and it processes locally without any upload.

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Using This on iPad (Split View and File Management)

iPad offers a better experience than iPhone for this task because of split-screen multitasking:

Split View workflow: Open Safari with the Protect PDF tool on one side and the Files app on the other. Drag a PDF directly from Files into Safari. This drag-and-drop works on iPad but not iPhone.

Apple Pencil and Markup: If you need to annotate a PDF before protecting it, use Markup first (in Files, tap the PDF, then the Markup icon). Add your annotations, save, then protect with a password. Once protected, the annotations are locked inside the encrypted file.

Managing protected PDFs: Create a folder in Files called "Protected" to keep your encrypted PDFs organized. Keep the unprotected originals in a separate folder — or delete them if you only need the protected versions.

Processing speed on iPad is faster than iPhone since iPads have more powerful chips. A typical PDF (5-50 pages) encrypts in under 5 seconds on any iPad from the last few years.

Sharing the Protected PDF From Your iPhone

After downloading the protected PDF, share it using the standard iOS share sheet:

1. Open the Files app and navigate to Downloads.
2. Long-press the protected PDF file.
3. Tap "Share."
4. Choose Mail, Messages, AirDrop, or any other sharing method.

Remember to send the password through a different channel than the PDF itself. If you email the PDF, text the password. If you AirDrop the PDF, tell the person the password verbally.

For frequently shared documents (like a password-protected price list or NDA template), you can add the protected PDF to your iCloud Drive and share a link. The recipient downloads the file and still needs the password to open it.

Frequently Asked Questions

Does this work in Chrome on iPhone?

Yes. The tool works in any browser on iOS — Safari, Chrome, Firefox, Brave. On iOS, all browsers use the WebKit engine, so performance is identical.

Can I protect a scanned document from the Notes app?

Yes. Scan the document in Notes, export it as PDF (Share > Create PDF), save to Files, then use the Protect PDF tool on the saved file.

What if I forget the password?

The password cannot be recovered. If you forget it, you lose access to the protected copy. Keep a record in your password manager, or use Apple Keychain.

Can I remove the password on iPhone too?

Yes. The Unlock PDF tool also works in Safari on iPhone. Enter the original password to remove protection and download an unprotected copy.