I have a problem when installing new fonts on Font book. I'm want to use this font: https://github.com/sunaku/tamzen-font, following the doc I download the zip, extract it and drag & drop all of the content of the /ttf folder into the app Font Book.

The problem is that of all the different font sizes available in the /ttf folder, when I try to select on of the new font, apps (like iTerm) recognise only one: TamzenForPowerline

enter image description here

In Font book all the different variants of the font are marked as duplicated, even though they are not (as you can see from the image the fonts are different):

enter image description here

Now, how can I tell Font book that those font are actually different?

  • It may be that the font is not constructed in a way that MacOS likes. Individual files for different sizes is a bit odd.
    – benwiggy
    Commented Apr 30, 2021 at 17:07

1 Answer 1


this is based on bitmap fonts (OTB) which in the past where optimised for a certain font size. This is not a font family. Therefore the Font ID - which is used by Fontbook to identify fonts - of each of them is the same. You could use e.g. FontForge to change the ID, but for a variety of reasons I wouldn’t recommend that. Why not use a vectorbased, monospaced font? There are lots available for free including bitmap-like looking ones e.g. here, here or here.

  • From an examination of the fonts, it's not the Font ID, but the internal font name that is the same for several different fonts.
    – benwiggy
    Commented Jun 4, 2022 at 17:32

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