Why my digital sign isn't showing up when I open it in other application?

Question

I have validated the signature and saved it but when I send it in the mail or open another application the digital sign (Green tick mark) isn't there. Are these digitally signed pdf files showing only in adobe or am I doing something wrong?

MikelKlink · Answer

The in-document validation result visualizations (green tick / red cross / yellow question mark) are a "feature" that's been deprecated for more than a dozen years. Thus, you shouldn't expect any consistent or continuing support for them.

What you observed, nonetheless, is the behavior documented by Adobe a long time ago: Signature fields with validation result visualizations shall be stored in the state with the yellow question mark.

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