How to view Packet bytes as decimal?

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There is no option other than hexadecimal or binary.

You can raise a feature request at https://gitlab.com/wireshark/wireshar... .

For now you can convert it using an other tool. For example copy as 'Printable Text' and pipe it through this Perl oneliner:
perl -e 'undef $/; $l = <>; $l =~ s/(.)/sprintf("%4d", ord($1))/egs; print $l;'