This is a simple tool to create 1 bit bitmaps that you can save as base64. You probably don't have a use for this, but if ya do try it out.

https://odyhibit.github.io/base64_paint/

Here is an example. resize the grid to 43x13 then load this base64 c4ii7zvxSRRJEhIolIkiQkURHyeISKIiJIkJFIREkSEc4Ii7ziAAAAAAAIsMQxRilRIIk1JSpiGeQ8ptQioIQAiVhTEGKA==