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How to Make a Signed PDF Read-Only on Android
Question details
The user needs to make a fillable PDF inspection report read-only to prevent editing after signing it on an Android device.
- Product
- Adobe Acrobat Reader Mobile
- Device & OS
- Android
- Scenario
- Completing and signing a fillable PDF inspection report using a mobile PDF reader on an Android tablet.
- Observed behavior
- The signed PDF remains editable because the mobile app lacks the desktop version's capability to save a signed document as a locked, read-only copy.
Before proceeding, ensure your PDF reader app is updated to the latest version on your Android device to access all available document security and password features.
Restrict Editing with Password Protection on Mobile
Use the built-in password feature in the mobile app to prevent unauthorized changes to the signed document.
Because the mobile version of Adobe Acrobat Reader does not support locking a document natively via digital signatures like the desktop app, setting a document password is the most effective workaround to restrict further editing on your Android device.
Launch Adobe Acrobat Reader on your Android device, open your signed PDF, and tap the three dots (More options) located in the upper-right corner of the screen.
From the dropdown menu, select the 'Set Password' option.
Enter a strong password and confirm it to restrict document access. Save the document to apply the security settings and prevent subsequent edits.
Use Desktop Software for Certified Read-Only Copies
For full digital signature certification and true read-only functionality, process the document on a desktop computer.
Secure and Share PDFs Easily with WPS Office
WPS Office provides a robust set of PDF tools for both mobile and desktop. It allows you to sign documents, encrypt them with customized permission passwords, and export them safely to prevent unwanted edits.
- 1. Install WPS Office: Download and open WPS Office on your Android device or PC.
- 2. Sign Your Document: Open your fillable PDF file and use the signature tool to complete your document.
- 3. Access Protection Tools: Navigate to the 'Protect' tab (or the Tools menu on mobile) and select 'Encrypt'.
- 4. Set Editing Restrictions: Set an editing password to restrict modifications while allowing recipients to view the document freely.
Frequently Asked Questions
Why doesn't Adobe Acrobat Reader on Android have a 'Save as Read-Only' option after signing?
The mobile app currently does not support the full digital signature and certification workflow found in the desktop version. As a result, it lacks the specific feature to lock a document into a read-only state upon signing.
Can I lock a PDF from editing without requiring a password to open it?
On many mobile apps, you can only set an 'open' password. To set a 'permissions' password—which restricts editing but allows viewing without a password—you generally need to use a desktop PDF editor like WPS Office or Adobe Acrobat PC.
Are there other ways to make a PDF uneditable on Android?
Yes, you can bypass editing issues by exporting or sharing the signed PDF as an image file (such as JPEG). Alternatively, you can use PDF tools that 'flatten' the document, which merges all form fields and signatures permanently into the background.
Will a password-protected PDF remain secure if opened on a computer?
Yes. Standard PDF encryption is retained across all devices and platforms. Anyone opening the file on a PC, Mac, or another mobile device will be required to enter the password to modify the document.
