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Update Adobe Approved Trust List (AATL) in Adobe Acrobat and Acrobat Reader

Time needed: 15 minutes

If you are seeing error messages with digitally signed documents in Adobe Acrobat or Acrobat Reader, you should make sure that the Adobe Approved Trust List (AATL) is up to date in your application. The AATL is comprised of certificate authorities (CAs), including SSL.com, that meet Adobe’s standards for issuing document signing certificates and are trusted on all Adobe products.

  1. Open the preferences for Acrobat or Acrobat Reader.

    Open the application and navigate to Edit > Preferences (Windows) or Acrobat / Acrobat Reader > Preferences (macOS).
    Acrobat Preferences

  2. Select Trust Manager.

    Select Trust Manager from the left-hand Categories menu.

    Trust Manager

  3. Enable trusted certificate downloads.

    Make sure that Load trusted certificates from an Adobe AATL server is checked.
    Load trusted certificates from an Adobe AATL server

  4. Update AATL.

    Click the Update Now button to download the latest version of the AATL.

    Update Now button

  5. Finish up.

    Acrobat / Acrobat Reader will notify you that your security settings have been updated. Close the dialog box and application preferences.
    Security settings have been updated

SSL.com’s Business Identity certificates offer secure S/MIME email protection, trusted digital signatures for Adobe PDF and Microsoft Office documents, and PKI-based client authentication, all for as low as $249.67 per year.


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