How can I create a variable font with multiple variations of each letter importing each letter as a jpg?

[SCarewe (Sebastian Carewe)]

What Georg is referring to is this:

Glyphs substitution on variable font

Have you tried using alternate layers? Otherwise, for variable fonts, consider using the rvrn feature. Add the feature in Font Info > Features. Let’s say you have a weight axis (axis tag: wght) from 200 to 900 and you want the shapes to switch at 750. The code would look like this: condition 750 < wght; sub a by a.alt; sub b by b.alt; And so on. This means that you need to have an .alt (or whatever suffix you want to use) glyph for every glyph you want t substitute. Does this make sense for …

Essentially, it won’t be a variable font in the sense that shapes/images interpolate between each other, but you switch shapes at certain axis locations. Have a look at the thread I linked (and read it a bit further, there’s some important info on limitations).