Fix Acrobat Tags Tab Greyed Out When Adding PDF Alt Text
Question details
The user is unable to add alternative text to a PDF because the structural tagging options are unavailable.
- Product
- Adobe Acrobat 9 Pro
- Device & OS
- not provided
- Scenario
- Attempting to add alternative text to images within a PDF to improve document accessibility.
- Observed behavior
- The Tags panel options are greyed out and inaccessible, preventing the user from editing or adding alt text.
Ensure you have the necessary permissions or passwords to modify the PDF file, as password security or restricted editing permissions are the most common causes of greyed-out accessibility settings.
Check and Remove Document Security Restrictions
If a PDF is protected against editing, structural features like the Tags tab will be disabled. You must remove these restrictions first.
PDF creators often restrict editing capabilities to prevent unauthorized changes. When these restrictions are active, accessibility and structural editing options, including the Tags tab, are greyed out.
Navigate to the top menu and select 'File', then click on 'Properties'.
Switch to the 'Security' tab to view the Document Security Details.
Check the 'Document Restrictions Summary' to see if 'Changing the Document' is set to 'Not Allowed'.
If restricted, click the 'Security Method' dropdown, select 'No Security', and enter the permissions password when prompted.
Save the document and reopen the Tags panel to verify that you can now add alt text.
Re-tag an Untagged Document
If the PDF was not originally created with tags, manual tagging options might be unavailable until you generate a base tag structure.
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Frequently Asked Questions
Why does my PDF say 'Secured' at the top?
A 'Secured' label indicates the author applied a password or certificate to restrict editing, printing, or copying. You must remove this security in the document properties using the correct permissions password to modify document tags.
Can I add alt text to a read-only PDF?
No, read-only properties prevent any structural changes. You need to save a copy of the PDF to your local drive and ensure the file properties (Right-click > Properties on Windows) do not have the 'Read-only' attribute checked.
What should I do if the 'Add Tags to Document' option fails?
If automatic tagging fails, the document may be an image-based scanned PDF. You will first need to run Optical Character Recognition (OCR) under the Document menu to convert images to editable text before applying tags.
Are tags required for a PDF to be accessible?
Yes, tags provide a hidden structured, textual representation of the PDF content. Screen readers rely on this tag tree to read the document in the correct reading order and to describe images using alternative text.
