There are hundreds of Windows and Linux apps which can open PDF, but so far only Adobe’s version is the only one which can attach a digital signature.
I normally use Zathura on Linux which is like a 5 MB maybe. It’s tiny, very configurable and JUST a pdf reader.
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Firefox can open PDFs and I’m not sure about the desktop versions, but the Android version is 117MB.
There are hundreds of Windows and Linux apps which can open PDF, but so far only Adobe’s version is the only one which can attach a digital signature. I normally use Zathura on Linux which is like a 5 MB maybe. It’s tiny, very configurable and JUST a pdf reader.