Turn an icon font into an SVG sprite

Any Unicode code point above the space character and not equal to the delete character 0x7F that the font's cmap table maps to a glyph; C0 and C1 control codes and the space itself are excluded, since icon fonts sometimes map them but they carry no useful outline.

Once a font maps more than 2000 code points, only the first 2000 in code-point order are turned into symbols; the summary line still reports the true total alongside the capped count so you know some were left out.

One SVG with display:none containing a symbol element per glyph, each with its own id in the form uXXXX and its own viewBox; a page later renders one with a use element pointing at that id, so the original font file never has to load.

The tool refuses, saying the font has no Unicode-mapped glyphs to build symbols from, since there is nothing in the cmap table to enumerate.

It works on any font with a cmap table, but it is built for icon fonts like Font Awesome and Material Icons, where every mapped code point is a meaningful icon rather than a normal letter someone would type.