Hi,
Please try again with this NuGet package:
Install-Package GemBox.Pdf -Version 2025.11.108
Note that this is a hidden (unlisted) version. To install it, you’ll need to run the above command on the NuGet Package Manager Console (Tools → NuGet Package Manager → Package Manager Console).
We have added support for not embedding the full font used in the signature appearance, reducing the output file size.
For this, please try setting the PdfSignatureAppearance.IsFontTransient to true before setting the PdfSignatureAppearance.Font.
Also, the OCSP responder certificate validation info will no longer be downloaded if the certificate has an OCSP No-Check extension, because Adobe Reader considers it valid for the same reason and doesn’t perform any revocation checks.
Does this solve your issue?
Regards,
Mario