PDF Editing Issues

Fix Read-Only PDF Form Fields Editable After Signing in Acrobat Reader iPad

Elise Williams Oct 19, 2026 869 views

Question details

Read-only PDF form fields configured in Acrobat DC unexpectedly remain editable after the document is signed using the Acrobat Reader app on an iPad.

Fix Read-Only PDF Form Fields Editable After Signing in Acrobat Reader iPad

Product: Adobe Acrobat Reader
Device & OS: iPadOS
Scenario: A user signs a PDF form containing read-only fields on an iPad, but the fields do not lock as expected.
Observed behavior: After signing the document on the iPad (version 18.10.02 or similar), the read-only fields can still be edited. However, when the same signed file is opened on Windows Desktop, the fields remain correctly locked.

Before you start

Before troubleshooting, ensure your iPad is connected to Wi-Fi to download any necessary app updates. Also, have access to a desktop computer with a PDF editor to modify advanced form properties if required.

Solution 1Recommended

Update Acrobat Reader and Verify Form Properties

Updating the iPad app resolves known signature validation bugs, and verifying properties ensures the form is configured correctly.

Older versions of the iPad Acrobat Reader app (such as 18.10.02) had known compatibility issues where the read-only flag was ignored post-signature. Updating the app and verifying the core document properties on a desktop is the best primary approach.

Update the iPad app

Open the App Store on your iPad, tap your profile picture at the top right, and scroll down to check for available updates. Tap the 'Update' button next to Adobe Acrobat Reader.

Verify read-only properties

Open the original PDF document in your desktop PDF editor. Right-click the specific form field, select 'Properties', and navigate to the 'General' tab to ensure the 'Read-Only' checkbox is ticked.

Re-test the document

Transfer the updated PDF back to your iPad. Open it in the recently updated Acrobat Reader app, apply your signature, and tap the fields to confirm they are now locked.

Update Acrobat Reader and Verify Form Properties

Provide Details to Support: If the issue persists after updating, consider sending the PDF file, your iPadOS version, and the Acrobat Reader version details to Adobe Support for further investigation.

Solution 2

Flatten or Password-Protect the PDF

Use a desktop PDF editor to flatten the document or enforce password protections to physically prevent any further edits.

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Frequently Asked Questions

Why do read-only fields become editable after signing on my iPad?

This is typically caused by a bug or compatibility issue in specific versions of the iPad PDF reader app, which fails to properly enforce the read-only properties assigned by the desktop software once the signature validates.

Can I fix the read-only issue directly on the iPad app?

Generally, you cannot alter advanced form field permissions natively within the free iPad reader. You must either update the app to receive bug fixes or use a desktop PDF editor to enforce stricter document protections.

What does flattening a PDF form mean?

Flattening a PDF merges interactive elements, such as text fields and signatures, into the main visual layer of the document. This turns the inputs into standard uneditable text and images, permanently preventing further modifications.

PDF Troubleshooting