Previewing files using Type 1 fonts

Originally, free TeX previewers were only capable of displaying bitmap (PK) fonts, but free Type 1 font rendering software has been available for some time, and many previewers now use such facilities.

The alternative, for previewers, is automatic generation of the requisite PK files (using gsftopk, or similar, behind the scenes).

In the unlikely event that your previewer isn’t capable of either, you have a couple options:

fonts/utilities/gsftopk (or browse the directory); catalogue entry
Browse support/gv; catalogue entry
fonts/utilities/ps2pk (or browse the directory); catalogue entry

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