--- title: "How to Password-Protect a PDF on iPhone (and Open or Save One)" description: "Password-protect a PDF on iPhone with the built-in Preview app, learn what an owner password is, and save, open or share password-protected PDFs safely." url: https://www.vaultforyou.app/blog/password-protect-pdf-iphone lang: en published: 2026-10-29 updated: 2026-10-29 author: "VaultForYou Editorial Team" publisher: VaultForYou --- # How to password-protect a PDF on iPhone, and open or save a locked one > Preview can put a password on a PDF in under a minute, but Apple's iPhone guide doesn't explain how to take it off, so keep an unlocked copy first. Published 2026-10-29 - Updated 2026-10-29 - By VaultForYou Editorial Team ## Quick answer To password-protect a PDF on iPhone, open it in the Preview app, tap the button next to the file name, tap Lock, and enter the same password in the Password and Verify fields. Require Password turns on, then confirm. Preview is built in from iOS 26. Tap Duplicate first if you want to keep an unprotected copy. - **Where:** Preview app -> open the PDF -> button next to the file name -> Lock. - **Which iOS:** Apple's iPhone guide covers Preview from iOS 26. No extra app needed. - **Owner password:** A second PDF password that controls printing, copying and changes, not opening. - **Removing it:** Not described for iPhone. Duplicate the PDF before you lock it. Open the PDF in the **Preview** app, tap the button next to the file name, tap **Lock**, then type the same password in the **Password** and **Verify** fields and confirm. Preview comes with iPhone from iOS 26, so you don't need another app or a computer. It's the right tool for a tax form, a medical record or a contract you're about to email. Do one thing first: tap **Duplicate** if you want to keep an unprotected copy, because Apple's iPhone guide doesn't describe how to take a password off again. The password protects that file; it doesn't lock the folder it's in. We checked these steps against Apple's iOS 26 and iOS 27 documentation in October 2026. Below: the steps, what an "owner password" is, how to save and open locked PDFs, and the mistakes that leave a copy unprotected. ## How to password-protect a PDF on iPhone 1. **Open the PDF in Preview** Open the Preview app, tap Recents or Browse, and tap the PDF. To turn paper into a PDF first, tap Scan Documents on Preview's start screen. 2. **Keep an unlocked copy if you need one** Tap the button next to the file name, then tap Duplicate. Apple recommends this if you want a copy that isn't password-protected. 3. **Tap Lock** Open the PDF you want to protect, tap the button next to the file name, then tap Lock. 4. **Enter the password twice** Type the same password in the Password and Verify fields. On iOS 27, Require Password turns on automatically; on iOS 26, turn on Require Password yourself. 5. **Confirm** Tap the confirm button (Done on iOS 26). Then store the password somewhere safe, such as a password manager. The button next to the file name is Preview's actions menu, where you'll also find Duplicate. The labels differ slightly between versions: on iOS 26 you turn on **Require Password** yourself and tap **Done**; on iOS 27 the switch turns on as soon as you enter the password. Got a paper document or photos rather than a PDF? Scan it into a PDF first: tap **Scan Documents** on Preview's start screen, capture each page, and Preview combines them into one PDF that you can then lock. Our guide on [how to scan documents on iPhone](/blog/scan-documents-iphone) covers scanning in more detail. ## What is the owner password for files on iPhone? A PDF can carry two different passwords, and the "owner password" prompt confuses a lot of people. - **The open password** (Apple calls it **Require Password To Open Document** on the Mac) is what you need to see the PDF at all. This is what Preview on iPhone sets when you tap Lock. - **The owner password** controls what you can do once the file is open. Apple's Mac Preview guide explains that it can restrict printing, copying text, adding annotations and other changes. The person who created the PDF chooses which actions need it. So if your iPhone asks for an owner password when you try to edit, annotate or print a PDF, the file opened fine but its creator restricted that action. You can still read it. To do the restricted action, you need the owner password from the person who made the file. Apple's iPhone guide describes a single Lock password only; to set separate owner permissions yourself, Apple documents doing it in Preview on a Mac, under **File -> Export -> Permissions**. ## How do I save a PDF that is password protected? Save it the same way as any PDF. The protection stays with the file. 1. **From Mail:** touch and hold the attachment, then choose **Save to Files**. 2. **From another app:** tap **Share** and choose **Save to Files** if the app offers it, then pick a folder. 3. **To open it later:** open the Preview app, find it under **Recents** or **Browse**, tap it and enter the password. Saving a locked PDF doesn't remove the password, and a copy you send on is still locked. If you need an unlocked copy and you know the password, Apple documents changing a PDF's password protection on a Mac: open it in Preview and choose **File -> Edit Permissions**. ## What a PDF password protects, and what it doesn't A password on the file goes wherever the file goes. That's its strength, and the reason the other copies matter. | Who or where | Can they read the PDF? | Why | |---|---|---| | Someone you email the locked PDF to | **Only with the password** | The password is part of the file. | | Someone with your unlocked iPhone opening the locked PDF | **Only with the password** | The PDF asks for its own password; your iPhone passcode doesn't open it. | | Your iPad, Mac or iCloud Drive | **Only with the password** | Copies of the locked file stay locked. | | Someone browsing your Files app | **They can read the file name** | The name isn't protected; name it something neutral. | | The unlocked duplicate or original | **Yes** | Those copies have no password. | | A copy in your email's Sent folder | **Yes, if you sent it before locking** | The old copy was never protected. | | Someone with an owner-password-only PDF | **Yes, it opens** | The owner password limits actions, not opening. | | You, after forgetting the password | **No** | Apple's guides describe no recovery. | ## Mistakes that leave a PDF exposed - **Leaving the unlocked copy next to the locked one.** Duplicate is for a backup you keep somewhere safe, not in the same folder. Delete unlocked copies you don't need. - **Sending the password in the same message.** Anyone who gets the email gets both. Send the password by another route, like a call or a different app. - **Choosing a short password.** A PDF password is only as strong as the password. Use a long one and store it in a password manager. - **Locking only part of the story.** Scans you took with the Camera may still be in Photos. Delete them once the locked PDF exists. - **Forgetting the old attachment.** If you emailed the document before locking it, that version is still in your Sent folder and the recipient's inbox. ## Other ways to protect documents on iPhone A locked PDF covers one file. Depending on what you're protecting, these may fit better or work alongside it: - **Lock the Files or Preview app** with Require Face ID, so nobody you hand your phone to can browse your documents. It opens with your iPhone passcode, though. See [how to lock apps on iPhone](/blog/lock-apps-iphone). - **Password-protect a Pages document.** In Pages, tap the More button, then **Document Options -> Set Password**. Apple says this encrypts the file. It protects the .pages file, not a PDF you export from it. - **Don't count on Notes for PDFs.** Apple doesn't let you lock a note that has a PDF attached. [Locked notes](/blog/lock-notes-iphone) work for text and photos only. There's still no way to put a password on a folder in Files. Our guide on [how to lock a folder on iPhone](/blog/lock-folder-on-iphone) ranks the workarounds. ## When a password on each PDF isn't enough Per-file passwords are ideal for sending one document. They're tiring for a growing collection, like ID scans, insurance cards and medical records: every new file needs locking, every file can have a different password, and every unlocked copy is a leak. For those, see [where to store passport and ID scans on iPhone](/blog/store-passport-id-scans-iphone). If you'd rather keep private documents and photos in one place behind one lock, we make VaultForYou, an app that stores the photos, videos and documents you choose in a vault that opens only with a pattern you draw. Files are encrypted on your iPhone and the keys stay in the iOS Keychain. Like a PDF password, a forgotten pattern can't be recovered, so export anything you can't afford to lose. > **One lock for all your private documents.** A vault on your iPhone that opens only with your pattern. No account needed. [Download on the App Store](https://apps.apple.com/app/vaultforyou/id0000000000) ## Frequently asked questions ### Can I password-protect a PDF on iPhone without another app? Yes, on iOS 26 and later. The built-in Preview app can lock a PDF: open it, tap the button next to the file name, tap Lock, and enter the password twice. If you don't see the Preview app, check for a software update. Apple's iPhone guide only describes Preview from iOS 26, so older versions need a third-party app or a computer. ### What is the owner password for files on iPhone? It's a second password a PDF can carry, set by whoever created the file. Apple's Mac Preview guide explains that the owner password controls actions such as printing, copying text and adding annotations, separately from the password that opens the PDF. If an iPhone app asks for it when you try one of those actions, you need it from the file's creator. ### How do I save a PDF that is password protected? Save it like any other file. In Mail, touch and hold the attachment and choose Save to Files; from other apps, use Share, then Save to Files. The password stays with the PDF, so you'll enter it whenever you open the saved copy. Saving it doesn't remove the protection. ### How do I remove a password from a PDF on iPhone? Apple's iPhone guide doesn't describe removing a PDF password, which is why it recommends tapping Duplicate before you lock a file. If you have a Mac, open the PDF in Preview, choose File -> Edit Permissions, and change its password settings there. Either way, you need the current password to open the file. ### What happens if I forget the PDF password? Plan on losing access. Neither Apple's iPhone guide nor its Mac Preview guide describes any way to recover a forgotten PDF password. If you made the file, look for the unlocked duplicate or the original you started from. If someone sent it to you, ask them to send the password again by another route. ### Can I put a PDF in a locked note instead? No. Apple says you can't lock notes with PDF attachments, along with video, audio, file attachments and Pages, Numbers or Keynote documents. The Lock option won't work while the PDF is in the note. Lock the PDF itself in Preview, or keep it in an app that locks the files inside it. ### Is a password-protected PDF safe in iCloud Drive? The password travels with the file, so a locked PDF stays locked when it syncs to iCloud Drive or your other devices. The weak points are elsewhere: the file name stays readable, an unlocked original or duplicate may sit in the same folder, and a short password is easy to guess. Delete unlocked copies you don't need. ## Bottom line To password-protect a PDF on iPhone, open it in **Preview**, tap the button next to the file name, tap **Lock** and enter a password twice. It's built in from iOS 26 and takes about a minute. Duplicate the file first if you'll ever need an unlocked copy, because Apple doesn't document removing the password on iPhone. If an app asks for an **owner password**, the PDF opened fine but its creator restricted printing, copying or editing; only they can give you that password. And whatever you lock, delete the unlocked copies, or the password protects nothing. Keep reading: - [How to scan documents on iPhone](/blog/scan-documents-iphone) - [How to lock a folder on iPhone](/blog/lock-folder-on-iphone) - [Where to store passport and ID scans on iPhone](/blog/store-passport-id-scans-iphone) ## Sources - [Apple Support: Lock PDFs in Preview on iPhone](https://support.apple.com/guide/iphone/lock-pdfs-iphe85f2ea31/ios) - [Apple Support: Lock PDFs in Preview on iPhone (iOS 26)](https://support.apple.com/guide/iphone/lock-pdfs-iphe85f2ea31/26/ios/26) - [Apple Support: Get started with Preview on iPhone](https://support.apple.com/guide/iphone/get-started-with-preview-iph7239ea3b5/ios) - [Apple Support: Password-protect a PDF in Preview on Mac](https://support.apple.com/guide/preview/password-protect-a-pdf-prvw587dd90f/mac) - [Apple Support: Download email attachments in Mail on iPhone](https://support.apple.com/guide/iphone/download-email-attachments-iph7fe7a50a7/ios) - [Apple Support: How to lock or unlock notes on your iPhone or iPad](https://support.apple.com/en-us/102537) ## Keep reading - [How to Lock a Folder on iPhone (Secure Folder Alternatives)](https://www.vaultforyou.app/blog/lock-folder-on-iphone): iPhone can't lock a folder or match Samsung's Secure Folder. Here are 5 workarounds, from locked Notes and Face ID app lock to vaults, ranked by protection. - [How to Scan a Passport With iPhone: Notes, Files or Preview](https://www.vaultforyou.app/blog/scan-documents-iphone): Scan a passport or ID with your iPhone in Notes, Files or Preview: the exact steps, tips for a sharp scan without glare, and where each scan is saved. - [Where to Store Passport and ID Scans on iPhone (Safely)](https://www.vaultforyou.app/blog/store-passport-id-scans-iphone): Don't leave passport and ID scans in your camera roll. Compare Photos, Hidden album, Notes, Files, Apple Wallet and a vault, then follow a 5-step safe setup. - [How to Lock Notes on iPhone, and What Locked Notes Can't Do](https://www.vaultforyou.app/blog/lock-notes-iphone): Lock notes on iPhone with your passcode or a separate password, fix notes that won't lock (tags, PDFs, video) and see who can still open your locked notes. --- Our guides are written and fact-checked by the VaultForYou team against Apple's own documentation. We make VaultForYou, a private vault app for iPhone. Download on the App Store: https://apps.apple.com/app/vaultforyou/id0000000000