File Download Base64

Is there a way to download image in format:
data:image/jpeg;base64,---
?

Do you mean downloading the base 64 encoding string?

Yes.

Just use

=Dump(RegexpFindOnUrl(A1;"(?<=src=\"")((data:image\/([a-zA-Z]*);base64,([^\""]*)))\""";1))

Where A1 is URL.