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Tom Greenwood: Sustainable Web Design (A Book Apart) 4 stars

The internet may be digital, but it carries a very physical cost. From image files …

We started with the original Inter UI font file in TTF format and converted it to a more efficient WOFF2 file format using Font Squirrel's Webfont Generator (FIG 4.2) bkaprt.com/swd/04-07/). This reduced the file size to 77 KB with no loss of quality whatsoever.

— Sustainable Web Design by  (Page 60)