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'this document is digitally signed. Some signatures are invalid' PDF error message

Anonymous
2024-11-04T17:35:57+00:00

When trying to open PDF documents on Microsoft Edge, I am getting the following error message 'this document is digitally signed. Some signatures are invalid'.

With this message it does not allow me to add text or edit the PDF. I used to be able to open the exact same document on the same laptop and it worked fine before. I am able to edit the same PDF document fine on my old laptop using Microsoft Edge. Can you help with this?

Microsoft Edge | Read PDFs | Windows 11

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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  1. Anonymous
    2024-11-05T08:45:22+00:00

    Hi, LMS_764

    Welcome to the Microsoft community.

    This error message may have the following causes:

    1. PDF file modification: If the PDF file has been modified, the original signature will become invalid.
    2. Expired or invalid signature certificate: The certificate used for the signature may have expired or become invalid.
    3. PDF reader version issue: Some versions of PDF readers may not handle signatures correctly.
    4. Network environment or account issues: Certain network environments or account settings may cause the signature to be invalid.

    From your description, since the same file could be opened in the past and on other devices, it is likely an issue with the PDF reader version. You can try switching the version of Edge's PDF Viewer to see if that resolves your issue.

    edge://flags/#edge-new-pdf-viewer

    Additionally, you can test with a different version of Edge to see if it is a problem with a specific version of Edge.

    Become a Microsoft Edge Insider | Microsoft Edge

    Best regards

    Tommy Jin | Microsoft Community Support Specialist

    10+ people found this answer helpful.
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  2. Anonymous
    2024-11-14T11:40:18+00:00

    Hi

    I just clicked the following link in the above post : edge://flags/#edge-new-pdf-viewer

    Then made sure this option was disabled which seemed to work for me.

    Hope this helps.

    6 people found this answer helpful.
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  3. Anonymous
    2024-11-11T15:54:24+00:00

    I am having the same issue. How did you switch the pdf version?

    thanks!

    2 people found this answer helpful.
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  4. Anonymous
    2024-11-05T15:14:38+00:00

    Thank you for your advice, much appreciated. Switching the PDF version seems to have resolved this issue.

    2 people found this answer helpful.
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  5. Anonymous
    2024-11-12T19:48:43+00:00

    Hi,

    I have a similar issue: the PDF signature is always declared unknown. Do you experience the same? Switching the PDF reader does not help. I believe they missed some root certificates. But even when I tried to include the certificate in edge, it could not validate the signature.

    Thankful for any hints!

    Best Berta

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